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Technical Instructions

LMV Series

Document No. LV3-1000

Appendix A

Page 24

SCC Inc.

Revert to Pilot - LMV37 only

Introduction

Revert to pilot is a feature on the LMV37 that allows the burner to re-light the pilot and close
the main gas valves (V1 and V2). This is done for two key reasons:

•

Eliminating energy losses due to postpurge and prepurge

•

Minimizing the time from a demand signal to burner heat production

Procedure

1.

Wire the LMV3 and RWF55 load controller as shown below in Figure 12.

Figure 12: LMV3 / RWF55 Revert to Pilot Wiring

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Summary of Contents for LMV3 series

Page 1: ...Combustion Controls LMV3 Linkageless Burner Management System www scccombustion com ...

Page 2: ...Intentionally Left Blank ...

Page 3: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 4: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 5: ...rs The LMV3 is extremely flexible and encompasses the following features Flame safeguard independent processor Fuel air ratio control Variable Frequency Drive VFD control Fuel usage monitoring Simultaneous operation of up to 2 rotary actuators up to 3 connected Dual fuel switchover Modbus communication Remote firing rate from building automation or external controller Valve proving valve leak test...

Page 6: ...ntrol with electronic fuel air ratio control of up to 2 actuators and a VFD with floating bumping capability Requires an external PID controller LMV36 520A1 Dual fuel burner control with electronic fuel air ratio control of up to 2 actuators 3 connected and a VFD without floating bumping capability Requires an external PID controller Display Qty 1 Required Each LMV3 must be equipped with one AZL23...

Page 7: ...y 1 Recommended with LMV36 Controllers The AGM60 dual fuel module is used to switch inputs and outputs between fuels on an LMV36 controller See page 19 for mounting information AGM60 4A9 Dual fuel module for switching inputs and outputs between fuels LMV36 only Dual Fuel Module Accessories Required with AGM60 One plug set and one connecting cable are required when using an AGM60 dual fuel module A...

Page 8: ...ication is via Modbus TCP IP Other communication types are available For more technical information about touchscreens refer to Document No TS 1000 TS Touchscreen kits with 6 or 10 touchscreen power supply interconnect terminals and optional PLC Modbus Interface Module Optional A separate interface module is required for Modbus communication with the LMV3 The cable that connects the interface modu...

Page 9: ...5 pin green connectors 1840405 3 3 pack of spare 6 pin green connectors Replacement plugs and cables are available for the OCI412 10 Modbus interface module PLUG412 10 Replacement plugs for terminals X10 and X20 on the OCI412 10 Modbus interface module CABLE412 10 Replacement cable for connecting the OCI412 10 Modbus interface module to the LMV3 A step up transformer is available to increase the v...

Page 10: ...e as SQM33 750A9 but with a NEMA 4 seal Coupling Qty 1 Required Provided With Some Mounting Brackets See Below Zero lash flexible couplings are available for SQM33 actuators For more information refer to Document No CPBK 1000 CCM10DCA Flexible couplings for SQM33 actuators Mounting Bracket Kits Optional Modular bracket kits are available to assist in mounting an SQM33 actuator to a variety of valv...

Page 11: ...nical information or Document No CPBK 4100 for installation instructions BR 3345CBAIR Bracket for mounting an SQM33 actuator to a Cleaver Brooks rotary air damper When using a Lucoma air damper the following actuator mounting kit is available No additional couplings are needed with this mounting kit Refer to Document No CPBK 3000 for technical information or Document No CPBK 3100 for installation ...

Page 12: ...5 SQM33 to 1 1 4 full port firing rate valve VA33 NM 125 SQM33 to 1 1 4 medium port firing rate valve VA33 NF 150 SQM33 to 1 1 2 full port firing rate valve VA33 NM 150 SQM33 to 1 1 2 medium port firing rate valve VA33 NR 150 SQM33 to 1 1 2 reduced port firing rate valve VA33 NF 200 SQM33 to 2 full port firing rate valve VA33 NM 200 SQM33 to 2 medium port firing rate valve VA33 NR 200 SQM33 to 2 r...

Page 13: ...M33 to 6 VKF butterfly valve Oil Firing Rate Control Valve Valve Actuator Assemblies Qty 1 Required if Firing Oil Not Using a Cleaver Brooks Oil Valve Pre built valve actuator assemblies are available to mount an SQM33 actuator to a Hauck S or AS series oil valve For more information about valve actuator assemblies using Hauck oil valves refer to Document No VA 4000 VA33 Valve actuator assemblies ...

Page 14: ...ator terminals on the LMV3 to RAST 3 5 terminals in order to improve ease of wiring ADP SQM33 RAST2 5 3 5 AIR SQM33 plug adapter for air actuator 220V LMV3 only ADP SQM33 RAST2 5 3 5 FUEL SQM33 plug adapter for fuel actuator 220V LMV3 only Variable Frequency Drive VFD Components Variable Frequency Drives VFDs Optional Pre programmed Variable Frequency Drives VFDs are available for use with the LMV...

Page 15: ...ing for a watertight seal and necessary mounting hardware Range 300 6300 RPM AGG5 310 Speed sensor and associated mounting kit Includes speed sensor 6 foot cable 3 finger speed wheel and necessary mounting hardware Range 300 6300 RPM Flame Scanners Ultraviolet Flame Scanners Qty 1 Required Two ultraviolet flame scanners are available one normal sensitivity and one high sensitivity Neither scanner ...

Page 16: ... barrier THERMAL 75X75 ACS410 Software for Laptop The ACS410 software for the LMV3 offers many features including parameter backups startup reports and trending The software may be downloaded at www scccombustion com ACS410 Cables Qty 1 Required if Using the ACS410 Software To use the ACS410 software cables are necessary to connect the LMV3 to a PC OCI410 20 User level PC interface module and cabl...

Page 17: ...0 AGM60 to LMV36 connecting cable AGV61 100 Stacking bracket Optional with AGM60 AGM60 mounting bracket AGG4 200 Touchscreen Optional Write in part number see Doc No TS 1000 Modbus Module Optional Modbus interface module OCI412 10 Control Panel Spare Parts Optional 5 pack of 120V main fuses FUSE6 3A SLOW 5 pack of 5 pin connectors 1840395 5 3 pack of 6 pin connectors 1840405 3 Replacement plugs fo...

Page 18: ...Technical Instructions LMV Series Document No LV3 1000 Section 1 Page 14 SCC Inc Intentionally Left Blank ...

Page 19: ...g adapter for air actuator ADP SQM33 RAST2 5 3 5 AIR Plug adapter for fuel actuator ADP SQM33 RAST2 5 3 5 FUEL VFDs Variable Frequency Drives Brake Resistors Line Load Reactors Optional Write in part number Contact SCC Speed Sensor Kits Qty 1 Required per VFD Speed sensor kit for conduit AGG5 305 Speed sensor kit w o conduit AGG5 310 Flame Scanner Flame Scanners Qty 1 Required UV forward view non ...

Page 20: ...Technical Instructions LMV Series Document No LV3 1000 Section 1 Page 16 SCC Inc Intentionally Left Blank ...

Page 21: ...d and tapped to accommodate these screws During the mounting process consideration should be given to the various plugs and wires that must be attached to the LMV3 Electrical connections are made via plugs that are located in the face of the unit with wires coming out to the top bottom and left side of the unit A space of at least one inch is recommended above below and to the left of the LMV3 The...

Page 22: ...ll swing out when the screw is tightened clockwise the screw can be loosened to retract the tab and increase clearance before tightening The tab will pinch the sheet metal of the enclosure door between itself and the AZL23 gasket This facilitates easy removal and replacement of the AZL23 since it is designed to be taken out of the enclosure face and held in the hands for setup and commissioning Th...

Page 23: ...60 The panel which the unit sits on should be drilled and tapped to accommodate these screws During the mounting process consideration should be given to the various plugs and wires that must be attached to the AGM60 Electrical connections are made via plugs that are located in the face of the unit with wires coming out to the top and bottom of the unit A space of at least one inch is recommended ...

Page 24: ...tion area of the LMV3 disconnect the unit from the main supply all polar disconnection Protection against electrical shock hazard on the LMV3 and all other connected electrical components must be ensured through good wiring and grounding practices Fall or shock can adversely affect the safety functions of an LMV3 Such units must not be put into operation even if they do not exhibit any apparent da...

Page 25: ...LMV Series Technical Instructions Document No LV3 1000 SCC Inc Page 21 Section 1 Section 1 5 Approvals The LMV3 has the following standards and approvals ...

Page 26: ...Technical Instructions LMV Series Document No LV3 1000 Section 1 Page 22 SCC Inc Intentionally Left Blank ...

Page 27: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 28: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 29: ...so they will only fit into one specific socket of the LMV3 eliminating the possibility of inserting a plug into an incorrect socket Each plug is designed to connect one external device or a small group of external devices such as gas valves to the LMV3 Each group of plugs on the front of the LMV3 provides line voltage neutral and protective earth ground so an additional terminal strip is not neces...

Page 30: ... grounding lug The purpose of PE is to provide a ground for all 120 VAC connections One wire from the secondary side of the control panel s main step down transformer should also be connected to the control panel grounding lug All of the PE terminals on the LMV3 are common Reference Ground The other type of ground is the Reference Ground GND These are found on the low voltage connections The purpo...

Page 31: ...2 2 LMV3 Terminal Descriptions Figure 2 2 1 LMV3 Terminal Layout General Notes Total combined load of all 120 VAC outputs cannot exceed 5 Amps All Line fused terminals are internally connected All Neutral terminals are internally connected All PE terminals are internally connected ...

Page 32: ...gurable 1 6A 120VAC X3 05 2 Programmable Output Alarm 210 Alarm start prevention 1A 120VAC X3 05 3 Fixed Output Continuous purging blower motor starter Not configurable 1 6A 120VAC X4 02 1 PE Protective Earth ground N A X4 02 2 Neutral Neutral X4 02 3 Programmable Output Ignition Transformer 226 266 326 366 Pre ignition time 227 267 327 367 Safety time 1 281 381 Oil ignition start 1 6A 120VAC X5 0...

Page 33: ...urable 500mA 120VAC X6 03 1 PE Protective Earth ground N A X6 03 2 Neutral Neutral X6 03 3 Fixed Output Outside main safety valve Typical Atomizing air compressor or gas booster 2A 120VAC X7 01 1 PE Protective Earth ground N A X7 01 2 Neutral Neutral X7 01 3 Programmable Output Main fuel valve V2 downstream or stage 2 oil valve 191 Revert to pilot 231 271 331 371 Safety time 2 232 272 332 372 Inte...

Page 34: ...2 Programmable Input Valve proving pressure switch or Low oil pressure switch 217 Max time home run 241 341 Valve proving 242 342 VP evacuation time 243 343 VP upstream test 244 344 VP fill time 245 345 VP downstream test 276 376 Low oil PS 286 Start release HO 287 Max time SRHO 1 5mA 120VAC X9 04 3 Line Line fused Not configurable 500mA 120VAC X10 05 1 PE Protective Earth ground N A X10 05 2 Prog...

Page 35: ...ut channel B X56 BCI Port AZL23 or OCI410 PC cable X64 1 Programmable Input 4 20 mA for load control or VSD speed shift 204 Invalid analog in 530 VSD speed shift 550 570 Shift delay 3 20mA 460Ω X64 2 4 20 mA for load control or VSD speed shift X64 3 Programmable Output PWM speed control signal to blower 542 VSD activation 641 VSD standardization 643 Type speed feedback 644 Feedback pulse rev 662 V...

Page 36: ...ammable Input Speed sensor pulse input 542 VSD activation 641 VSD standardization 643 Type speed feedback 644 Feedback pulse rev 662 VSD neutral zone 663 VSD near zone 0 10VDC X74 5 Fixed Output Speed sensor power supply Not configurable 15mA 10VDC X75 1 Programmable Input Fuel meter pulse input low 0 1 5VDC high 3 10 VDC 128 129 Fuel meter scale 0 24 VDC 0 1 300 Hz X75 2 Fixed Output Fuel meter p...

Page 37: ... 3 AGM60 Terminal Descriptions Figure 2 3 1 AGM60 Terminal Layout General Notes Total combined load of all 120 VAC outputs cannot exceed 5 Amps All Line fused terminals are internally connected All Neutral terminals are internally connected All PE terminals are internally connected ...

Page 38: ...1 6A 120VAC X8 02 1 Main fuel valve V1 upstream fuel 1 X8 02 2 Tie Point Use as a tie point EU use only N A X8 02 3 Neutral Neutral X8 02 4 PE Protective Earth ground X8 03 1 Output Main fuel valve V2 downstream fuel 1 1 6A 120VAC X8 03 2 Tie Point Use as a tie point EU use only N A X8 03 3 Neutral Neutral X8 03 4 PE Protective Earth ground X9 04 1 X9 04 2 Input Valve proving pressure switch or lo...

Page 39: ...PS or POC or valve proving pressure switch Oil trains High oil PS or POC common 1 5mA 120VAC X32 01 2 Input Main fuel valve V1 upstream common 1 6A 120VAC X32 01 3 Main fuel valve V2 downstream common X32 01 4 Output Valve proving pressure switch or low oil pressure switch common 1 5mA 120VAC X32 01 5 Input Outside main safety valve Typical atomizing air compressor or gas booster common 1 6A 120VA...

Page 40: ...Technical Instructions LMV Series Document No LV3 1000 Section 2 Page 12 SCC Inc 2 4 Wiring Diagrams ...

Page 41: ...LMV Series Technical Instructions Document No LV3 1000 SCC Inc Page 13 Section 2 ...

Page 42: ...Technical Instructions LMV Series Document No LV3 1000 Section 2 Page 14 SCC Inc ...

Page 43: ...LMV Series Technical Instructions Document No LV3 1000 SCC Inc Page 15 Section 2 ...

Page 44: ...Technical Instructions LMV Series Document No LV3 1000 Section 2 Page 16 SCC Inc ...

Page 45: ...LMV Series Technical Instructions Document No LV3 1000 SCC Inc Page 17 Section 2 ...

Page 46: ...Technical Instructions LMV Series Document No LV3 1000 Section 2 Page 18 SCC Inc ...

Page 47: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 48: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 49: ...estore change passwords 100 General information configuration Modbus 200 Settings specific to fuel 0 300 Settings specific to fuel 1 LMV36 only 400 Fuel air ratio curves 500 Special positions modulation ramps VSD speed shift 600 Actuators and VSD configuration 700 Fault history 800 N A 900 Operational data Some parameters have multiple indexes For example parameter 501 will initially display as 50...

Page 50: ...ed SW Software version of the LMV3 associated with the parameter set stored in the AZL Production Date Date that the LMV3 was produced in the DD MM YY format Serial Number Serial number of the LMV3 Default Parameter Set Code Parameter set code for the default parameters Default Parameter Set Version Version revision of the default parameter set LMV3 SW Version Factory loaded LMV3 software version ...

Page 51: ... the brightness of the backlight on the AZL display A value of 100 is maximum brightness Password Timeout O 60 min 10 120 min Sets the password timeout on the AZL display If no buttons are pressed on the AZL display for longer than this period of time the AZL automatically logs out of the OEM O or service S level and reverts back to the user U level Fuel Meter Scale 0 0 400 This sets the number of...

Page 52: ...essing Enter Parameter only exists on an LMV36 Displays the total number of startups Not resettable Displays the total number of startups on both fuels LMV36 or total startups LMV37 Not resettable Fuel Used Displays the totalized volume of fuel This value can be reset by pressing the left or right arrow to change the value to 0 and then pressing Enter Total Revert Parameter only exists on an LMV37...

Page 53: ...ves before turning the burner off Repetition Safe 1 O 1 1 4 Sets the number of times the LMV3 will attempt to light off when a flame failure occurs during pilot trial for ignition or main trial for ignition After this number of tries a lockout will occur Repetition HO S 3 1 16 Parameter only exists on an LMV37 Sets the number of times the LMV3 will attempt to start up if a start release for heavy ...

Page 54: ...The LMV3 can be held in the following phases 0 deactivated 1 phase 24 prepurge position 2 phase 36 ignition position 3 phase 44 interval 1 pilot stabilization 4 phase 52 interval 2 main stabilization Alarm Start Prevent 1 0 1 Determines if the alarm output X3 05 2 will be energized in the event of a start prevention an alarm in standby The LMV3 will wait 5 seconds after receiving a call for heat b...

Page 55: ...his parameter only has effect on the low oil pressure switch if parameter 276 fuel 0 or 376 fuel 1 are set to 1 If parameter 276 or 376 are set to 2 the low oil pressure switch must be made by the beginning of safety time 1 phase 40 221 261 321 361 Flame Detector Select 1 0 1 This parameter sets the type of flame scanner that is connected to the LMV3 0 QRB flame scanner Europe 1 QRA flame scanner ...

Page 56: ...s used this setting defines the overlap of the spark output X4 02 3 and the pilot valve output X7 02 3 After this time expires the spark is de energized but the pilot valve remains open if a flame is still present If a flame is not sensed a lockout will occur If directly spark igniting the main fuel this defines the overlap of the spark and the main fuel valves outputs X8 02 1 and X7 01 3 This tim...

Page 57: ... valve proving on shutdown 3 valve proving on startup and shutdown 242 342 VP Evacuation Time 3 sec 0 2 10 sec If valve proving is performed this specifies the length of time that the downstream valve V2 is energized output X7 01 3 This will evacuate any gas that might exist between the gas valves Sets the length of phase 80 Note The time it takes for the gas valve to be at least half open must be...

Page 58: ... Start 0 0 1 On oil trains this setting defines the point at which the ignition transformer is energized during the startup sequence 0 phase 38 short pre ignition use parameter 266 or 366 to set the length of time 1 phase 22 long pre ignition 248 284 348 384 Postpurge Time 3 1 sec 1 6480 sec This setting defines the optional postpurge time If a call for heat exists during this time the LMV3 stops ...

Page 59: ...n Index 01 prepurge position Index 02 postpurge position Special Position VSD 00 0 01 100 02 50 0 100 This sets the special positions for the VSD PWM blower Index 00 home position Index 01 prepurge position Index 02 postpurge position Ramp Up VSD 10 sec 5 40 sec This sets the speed that the VSD ramps up This setting is active during modulation as well as driving to special positions home prepurge ...

Page 60: ...VSD ramp time parameters 522 and 523 Load Low Fire Not set 20 100 Sets the low fire load During normal operation the burner will not modulate below this point Load High Fire Not set 20 100 Sets the high fire load During normal operation the burner will not modulate above this point VSD Shift Low 4 15 0 Sets the absolute lower limit for VSD speed shift This percentage is based on the standardized s...

Page 61: ...d at your eye Index 00 fuel actuator Index 01 air actuator 0 counterclockwise 1 clockwise Note The direction of rotation of the air actuator can only be set under parameter 602 and is not displayed under parameter 609 Rotation Direction 600 Level Actuator and VSD Configuration Determines the reference point of the SQM33 actuators The actuators will reference after a normal shutdown lockout or loss...

Page 62: ...Index 00 recorded standardized speed in RPM Index 01 recorded standardized speed in RPM redundant for monitoring Type Speed Feedback 0 0 1 This sets if the speed signal from the motor is asymmetric or symmetric If using a VFD and 3 phase motor with a speed wheel this must be set for asymmetric Most brushless DC blowers have a symmetric pulsed output 0 asymmetric 1 symmetric Feedback Pulse Rev 3 1 ...

Page 63: ... VSD Neutral Zone 0 5 0 5 3 5 Sets the width of the neutral zone for speed control Percentages are based on the standardized speed parameter 642 When the speed lies within the neutral zone the speed is considered to be in range and modulation is not paused The neutral band has no associated timing VSD Near Zone 2 2 5 5 Sets the width of the near zone for speed control Percentages are based on the ...

Page 64: ...meter sets the VSD speed above which this pressure switch is expected to be closed on Fault History U Shows the current status fault along with the 24 most recent faults 701 current status 702 most recent fault 703 next most recent fault etc Each fault has indices that provide additional information about the fault Index 01 code Index 02 diagnostic Index 03 class not used in North America Index 04...

Page 65: ...X5 03 3 LMV37 only Current Fuel U Parameter only exists on an LMV36 Displays the current fuel selected 0 or 1 Input Status Displays the status of the inputs index 00 and outputs index 01 with a bit coded total Input Count Contact feedback network counter register Output Status Displays the required state of the output relays with a bit coded total Incoming Voltage Displays the real time mains volt...

Page 66: ... phase and outlines the method that is used to check the actuators position Notes 1 If parameter 235 335 is set to 2 air pressure switch input X3 02 1 can be de energized in phases 60 66 without an alarm This is only allowed on pneumatic fuel trains 2 After the main valves open the high and low pressure switch inputs are ignored for the length of time specified by parameter 229 269 329 369 This is...

Page 67: ...ormed on startup immediately after phase 30 the actuators will be in prepurge position If gas valve proving is performed on shutdown immediately after phase 62 the actuators will be in the same position as they were in phase 62 The actuators will not move during valve proving 9 Actuator position is checked by using one of three methods The method used depends upon the phase of the sequence Positio...

Page 68: ...ch M N A Flame Signal X X X X X M F X X X X X X3 02 1 Blower Air Switch APS Note 1 F X M X5 01 2 Low Gas Pressure Switch Note 2 High Gas Pressure Switch Note 2 3 POC Note 3 F X M X9 04 2 Valve Proving Pressure Switch M F X X3 05 1 Fan X X X X X X3 05 3 Continuous Fan X4 02 3 Ignition X X X X X X X X X X X X X X X X X X X X X X X3 05 2 Alarm Note 4 X X X X X X X X X X X X X X X X X X X X X X X6 03 ...

Page 69: ...n Off Switch M N A Flame Signal X X X X X M F X X X X X X3 02 1 Blower Air Switch APS Note 1 F X M X5 01 2 Low Gas Pressure Switch Note 2 High Gas Pressure Switch Note 2 3 POC Note 3 F X X X X M X9 04 2 Valve Proving Pressure Switch M F X X3 05 1 Fan X X X X X X3 05 3 Continuous Fan X4 02 3 Ignition X X X X X X X X X X X X X X X X X X X X X X X X X X X X X3 05 2 Alarm Note 4 X X X X X X X X X X X ...

Page 70: ... Switch M N A Flame Signal X X X X X M F X X X X X X3 02 1 Blower Air Switch APS Note 1 F X M X5 01 2 Low Gas Pressure Switch Note 2 High Gas Pressure Switch Note 2 3 POC Note 3 F X X X X M X9 04 2 Valve Proving Pressure Switch M F X X3 05 1 Fan X X X X X X3 05 3 Continuous Fan X4 02 3 Ignition X X X X X X X X X X X X X X X X X X X X X X X X X X X X X3 05 2 Alarm Note 4 X X X X X X X X X X X X X X...

Page 71: ...Switch M N A Flame Signal X X X X X M F X X3 02 1 Blower Air Switch APS Note 1 F X M High Oil Pressure Switch Note 2 3 POC Note 3 F X M X9 04 2 Low Oil Pressure Switch Note 5 X3 05 1 Fan X X X X X3 05 3 Continuous Fan X4 02 3 Ignition Note 6 X X X X X X X X X X X X X3 05 2 Alarm Note 4 X X X X X X X X X X X X X X X X X X6 03 3 Oil Valve SV Usually Outdoor X X X X X8 02 1 Oil Valve V1 Main X X X X ...

Page 72: ...X5 03 1 On Off Switch M N A Flame Signal X X X X X M F X X3 02 1 Blower Air Switch APS Note 1 F X M X5 01 2 Low Gas Pressure Switch High Oil Pressure Switch Note 2 3 POC Note 3 F X M X9 04 2 Low Oil Pressure Switch Note 5 X3 05 1 Fan X X X X X X3 05 3 Continuous Fan X4 02 3 Ignition X X X X X X X X X X X X X X X X X X X X X3 05 2 Alarm Note 4 X X X X X X X X X X X X X X X X X X X X X6 03 3 Oil Val...

Page 73: ... M N A Flame Signal X X X X X M F X X3 02 1 Blower Air Switch APS Note 1 F X M X5 01 2 Low Oil Pressure Switch High Oil Pressure Switch Note 2 3 POC Note 3 F X M X9 04 2 Heavy Oil Direct Start Note 7 X3 05 1 Fan X X X X X3 05 3 Continuous Fan X4 02 3 Ignition Note 6 X X X X X X X X X X X X X3 05 2 Alarm Note 4 X X X X X X X X X X X X X X X X X X6 03 3 Oil Valve SV Usually Outdoor X X X X X8 02 1 O...

Page 74: ...M N A Flame Signal X X X X X M F X X3 02 1 Blower Air Switch APS Note 1 F X M X5 01 2 Low Oil Pressure Switch High Oil Pressure Switch Note 2 3 POC Note 3 F X M X9 04 2 Heavy Oil Direct Start Note 7 X3 05 1 Fan X X X X X3 05 3 Continuous Fan X4 02 3 Ignition Note 6 X X X X X X X X X X X X X3 05 2 Alarm Note 4 X X X X X X X X X X X X X X X X X X6 03 3 Oil Valve SV Usually Outdoor X X X X X8 02 1 Oi...

Page 75: ...rtage Phase 00 02 10 12 22 24 30 35 36 38 40 42 44 50 52 60 62 64 65 66 67 68 69 70 72 74 78 80 81 82 83 90 Actuator Description Notes Expected Position Note 8 T PrP M S T H Position Required to Proceed Note 9 Dynamic Position Checking Note 9 Run Time Position Checking Note 9 Expected Position Note 8 T M S T H Position Required to Proceed Note 9 Dynamic Position Checking Note 9 Run Time Position C...

Page 76: ...Technical Instructions LMV Series Document No LV3 1000 Section 3 Page 28 SCC Inc Intentionally Left Blank ...

Page 77: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 78: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 79: ...isites for Basic LMV3 Systems 2 Pre Requisites for LMV3 Systems with a VSD 4 Configuring Parameterization of an LMV3 with a Default Parameter Set 5 Transferring Parameter Sets Using the AZL Display 17 Suggested Initial Light off for LMV3 Systems 18 Suggested Ratio Control Curve Commissioning 19 Additional Tips for Commissioning 23 ...

Page 80: ...aft couplings must accomplish the following i Compensate for both angular and parallel shaft misalignment generated by the mounting bracket ii Have little or no backlash iii Be robust enough to absorb the stall torque of the actuator without damage Solid rigid shaft couplings are not acceptable in most applications Clamp type couplings that have a D shape are preferred since these will not damage ...

Page 81: ...n the building are being operated b The fuel gas pressure regulator on the burner being commissioned should not be fully open at high fire and should not be bouncing off the seat at low fire Fuel regulator must be sized properly and have adequate turndown capability 5 A temporary stack gas analyzer that has been calibrated and at a minimum reads O2 and CO ppm must be used for setting combustion 6 ...

Page 82: ...on Both the LMV3 and VFD must be configured for a 0 10 VDC signal b Ramp rates between the LMV3 and the VFD must be compatible In general ramp rates of the VFD should be 10 seconds less than the LMV3 c VFD must be set up as a slave unit for a 0 10 VDC signal Damping dead band and PID functions must be disabled d The frequency Hz output of the drive must be directly proportional to the analog input...

Page 83: ...l state OFF UPr This means that the unit is in standby and has not yet been fully commissioned 1 Log in at the OEM password level To do so hold down the F and A buttons together until CodE is displayed Type in the OEM password and press Enter to log in From the factory the OEM password for the LMV3 is EntrY 2 Set the Burner ID via parameter 113 The Burner ID is a unique number which matches the bu...

Page 84: ...2 is typically replaced by an SKP55 75 for pneumatically linked gas trains Operating Mode Parameter 201 fuel 0 or 301 fuel 1 Fuel Train Fuel Actuator Air Actuator VSD Speed Feedback if activated Description 1 G mod Modulating gas direct ignition electronically linked fuel to air ratio 7 G mod pneu Modulating gas direct ignition pneumatically linked fuel to air ratio 14 G mod pneu Modulating gas di...

Page 85: ...n SKP55 75 for pneumatically linked gas trains Operating Mode Parameter 201 fuel 0 or 301 fuel 1 Fuel Train Fuel Actuator Air Actuator VSD Speed Feedback if activated Description 2 Gp1 mod Modulating gas pilot ignition 1 pilot between V1 and V2 electronically linked fuel to air ratio 8 Gp1 mod pneu Modulating gas pilot ignition 1 pilot between V1 and V2 pneumatically linked fuel to air ratio 15 Gp...

Page 86: ...tically linked gas trains Operating Mode Parameter 201 fuel 0 or 301 fuel 1 Fuel Train Fuel Actuator Air Actuator VSD Speed Feedback if activated Description 3 Gp2 mod Modulating gas pilot ignition 2 pilot before V1 and V2 electronically linked fuel to air ratio 9 Gp2 mod pneu Modulating gas pilot ignition 2 pilot before V1 and V2 pneumatically linked fuel to air ratio 16 Gp2 mod pneu Modulating g...

Page 87: ...alve Operating Mode Parameter 201 fuel 0 or 301 fuel 1 Fuel Train Fuel Actuator Air Actuator VSD Speed Feedback if activated Description 4 Lo mod Modulating light oil direct ignition electronically linked fuel to air ratio 12 Lo mod 2V Modulating light oil direct ignition electronically linked fuel to air ratio OEMspecific 22 Lo mod Modulating light oil direct ignition electronically linked fuel t...

Page 88: ...itch V1 Oil valve main V2 Stage 2 oil valve Operating Mode Parameter 201 fuel 0 or 301 fuel 1 Fuel Train Fuel Actuator Air Actuator VSD Speed Feedback if activated Description 5 Lo 2 stage 2 stage light oil direct ignition electronically linked fuel to air ratio 17 Lo 2 stage 2 stage light oil direct ignition electronically linked fuel to air ratio without actuators ...

Page 89: ...ge 2 oil valve V1 Oil valve main V3 Stage 3 oil valve Operating Mode Parameter 201 fuel 0 or 301 fuel 1 Fuel Train Fuel Actuator Air Actuator VSD Speed Feedback if activated Description 6 Lo 3 stage 3 stage light oil direct ignition electronically linked fuel to air ratio 18 Lo 3 stage 3 stage light oil direct ignition electronically linked fuel to air ratio without actuators ...

Page 90: ...Oil valve main V2 Stage 2 oil valve Operating Mode Parameter 201 fuel 0 or 301 fuel 1 Fuel Train Fuel Actuator Air Actuator VSD Speed Feedback if activated Description 10 Lo Gp mod Modulating light oil gas pilot ignition electronically linked fuel to air ratio 13 Lo Gp mod 2V Modulating light oil gas pilot ignition electronically linked fuel to air ratio OEMspecific ...

Page 91: ...Fuel Train Option 11 Legend PS Pressure switch V1 Oil valve main V2 Stage 2 oil valve Operating Mode Parameter 201 fuel 0 or 301 fuel 1 Fuel Train Fuel Actuator Air Actuator VSD Speed Feedback if activated Description 11 Lo Gp 2 stage 2 stage light oil gas pilot ignition electronically linked fuel to air ratio ...

Page 92: ...is at 0 Flat will be perpendicular to line B when indicated actuator position is 90 This is how the actuator s shaft comes from the factory b Clockwise Rotation Flat is perpendicular to line B when indicated actuator position is at 0 Flat will be perpendicular to line A when indicated actuator position is 90 6 Set actuator home standby positions if necessary via parameters 501 506 Defaults are 0 a...

Page 93: ...torque against mechanical stops on the valve damper when at home position Adjust home positions if necessary NOTE Actuator shaft couplings must compensate for both angular and parallel shaft misalignment due to the mounting bracket Solid rigid shaft couplings are not acceptable in most applications especially when formed or welded mounting brackets are used Couplings should have little to no backl...

Page 94: ...ed If the burner is equipped with a VFD see Section 5 in this literature if the VFD parameters are not already set and for a more detailed standardization procedure PWM blowers are typically pre programmed and do not require any additional programmed Once the VSD parameters are set standardize the VSD via parameter 641 Once parameter 641 is set to 1 the air damper should open to its pre purge posi...

Page 95: ...ot the same as B1 change the burner ID on B2 to match B1 via parameter 113 The OEM or service level password will be required to change the burner ID 5 Power off B2 LMV3 After B2 LMV3 is powered off remove the AZL from B2 and replace with the AZL from B1 Power B2 LMV3 back on 6 Now that the burner IDs match the B1 parameter set can be downloaded into B2 via parameter 050 Select Restore and set the...

Page 96: ...witches etc 6 Hold down the F and A buttons together to access the LMV3 parameters If not already logged in log in using the OEM password The default OEM password is EntrY When parameter 400 is displayed press Enter 7 Parameter 201 will be displayed Parameter 201 sets the fuel train type This was set in an earlier step If no changes are necessary press the button 8 Parameter 542 will be displayed ...

Page 97: ...er switch and proceed to reset the LMV3 The text OFF UPr should be displayed Open the manual main fuel gas valve To start the burner again use the procedure from steps 6 12 13 14 and 15 above to light the pilot off again Once the pilot flame is established again and P0 is displayed press the button and attempt to light the main flame 18 If the main flame lights P0 will be displayed one last time A...

Page 98: ...dsheet NOTE While commissioning the Ratio Control Curves it is the responsibility of the technician to ensure that safe fuel to air ratios are being maintained If an AZL23 or button is held down when adjusting an actuator position the position will be changed at a progressively faster rate 5 Press the button eight times until P9 high fire is displayed Now increase the effective firing rate of the ...

Page 99: ...8 6 22 0 12 0 65 0 4 4000 4 00 1 17 1 5 98 0 3310 8 30 0 18 0 70 0 5 4800 4 80 1 41 2 2 117 6 3972 9 42 0 28 0 75 0 6 5600 5 60 1 64 2 9 137 2 4635 1 55 0 39 0 80 0 7 6400 6 40 1 87 3 8 156 8 5297 3 63 0 48 0 85 0 8 7200 7 20 2 11 4 9 176 4 5959 4 68 0 56 0 90 0 9 8000 8 00 2 34 6 0 196 0 6621 6 75 0 64 0 95 0 CURVE POINTS Burner Output Manually Input during Ratio Control Curve Commissioning Actua...

Page 100: ...ext point After Point 1 has been set press the Escape button 8 Parameter 546 will be displayed Parameter 546 sets the maximum fire rate of the burner Once this has been set press the button 9 Parameter 545 will be displayed Parameter 545 sets the minimum fire rate of the burner Once this has been set press the Escape button NOTE Parameter 545 can only be set as low as 20 This does not mean that th...

Page 101: ...portions For CO to be explosive in air it must reach a concentration of at least 12 5 125 000 ppm with an ignition source present If a burner is commissioned properly actuator curves should increase smoothly with increasing load firing rate Curves should always be smooth with no sharp corners The best and fastest method to commission a burner with an LMV3 is to set up a small table where the techn...

Page 102: ...Technical Instructions LMV Series Document No LV3 1000 Section 4 Page 24 SCC Inc Intentionally Left Blank ...

Page 103: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 104: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 105: ... VFDs Vector and Volt Hz 7 Configuring VFDs for use with the LMV3 7 Brushless DC Blowers PWM Blowers 9 Centrifugal Blower Fundamentals 10 Standardized Speed Standardizing the LMV3 11 Blower Speed Monitoring 16 Blower Speed Response during Operation 18 Suggested Setup Procedure for the VSD Control Parallel Positioning Application 20 Suggested Setup Procedure for the VSD Speed Shift 23 Additional Ti...

Page 106: ...used to power the combustion air blower Modern VFDs operate by taking single or three phase AC and rectifying this power to high voltage direct current DC for the DC bus The AC power is typically rectified to DC with banks of diodes The DC bus feeds a bank of Insulated Gate Bipolar Transistors IGBTs and a microprocessor is used to fire the IGBTs in a way that the voltage and frequency of the modif...

Page 107: ...e on the input side of the drive is typically low when a relatively small VFD is being fed by a relatively large transformer In this situation the supply side of the drive is stiff meaning that an instantaneous current draw by the drive will be met very quickly by the large transformer think square wave form causing voltage and current distortions in the power distribution system feeding the drive...

Page 108: ... reactor will be necessary for this application The same conclusion can also be arrived at by using Figure 5 1 Example 2 A 10 HP drive is fed by a 400 kVA transformer Is a line reactor required Using the same assumptions and calculation as example 1 the kVA ratio is 53 7 but the transformer is smaller than 600 kVA so a line reactor is not necessary The same conclusion can also be arrived at by usi...

Page 109: ...ts some of which are detailed on the previous pages This fast switching of the IGBTs can also cause shaft current on the motor When this happens a voltage charge builds up on the motor s shaft When this voltage gets high enough it will arc to ground through the path of least resistance The path of least resistance is typically the ball bearings that support the rotor of the motor When this arcing ...

Page 110: ...back to the VFD as electrical energy 2 Fast ramp times The faster the ramp times the faster the blower wheel must be accelerated and decelerated Just like a car more energy is required to accelerate quickly bigger engine and more energy is required to be dissipated when decelerating quickly bigger brakes Decelerating a given blower wheel more quickly will push more electrical energy back to the VF...

Page 111: ... of the current and other data taken from the rotating motor In reality Open Loop Vector mode does have feedback but the Vector VFD itself does not require a separate encoder to achieve this Since Vector VFDs use a mathematic model of the motor and the design of motors differs somewhat between motor OEMs a static or dynamic auto tune is sometimes required so that the Vector VFD learns key aspects ...

Page 112: ...S shaped ramps and PID filtering on the 0 10 VDC signal will cause speed faults on the LMV3 8 The VFD analog input signal should be configured for a 0 10 VDC signal and it should be spanned so that 0 VDC 0Hz and 10 VDC 62 Hz for blowers designed for 60 Hz power The additional 2 Hz is to make sure that full blower speed is achievable even with a 9 5 VDC standardization see standardization section b...

Page 113: ...l of a brushless DC motor can be more challenging as compared to a VFD and a three phase AC motor The primary reasons behind this are the electromechanical characteristics of the motors themselves As previously mentioned the speed of a three phase AC motor will follow the frequency of sine waves AC power that is being fed with a small amount of variance due to torque induced slip An increased torq...

Page 114: ...s directly proportional to the RPM of the blower 2 The static output pressure of the blower SP varies by the square of the change in RPM 3 The required brake horsepower of the blower BHP varies by the cube of the change in RPM Example A blower spinning at 1750 RPM produces 10 in WC of static pressure 4500 CFM of flow and requires 20 BHP What happens if the RPM is increased to 2750 RPM Assumptions ...

Page 115: ... energized closing a relay and enabling the VFD if equipped 3 A 95 or 98 speed signal is applied to the VSD This can be a 0 10 VDC or a PWM signal If parameter 661 is set to 0 then a 95 signal will be used If parameter 661 is set to 1 a 98 signal will be used 4 The blower ramps up to speed After the speed has stabilized the actual RPM is recorded by the LMV3 and is stored under parameter 642 5 The...

Page 116: ... 5 2658 45 0 30 9 5 3101 52 5 34 9 5 3544 60 0 38 9 5 3544 60 0 42 0 3101 52 5 46 0 2658 45 0 50 0 2215 37 5 54 0 1772 30 0 58 0 1329 22 5 62 0 886 15 0 66 0 443 7 5 70 0 0 0 0 Figure 5 3 Standardization Process for a 2 Pole Blower Motor values are approximate 0 1 2 3 4 5 6 7 8 9 10 11 0 500 1000 1500 2000 2500 3000 3500 4000 0 10 20 30 40 50 60 70 Speed Signal VDC Blower Speed RPM Time Sec Standa...

Page 117: ... interpolation is automatically done by the LMV3 which establishes the linear relationship between the speed signal and the blower RPM In fact this relationship is the slope of the line with a 0 intercept and is defined with an equation This equation states that for every 1 VDC increase in speed signal the blower speed should increase by 373 05 RPM This relationship is shown in Figure 5 4 Figure 5...

Page 118: ...d can compensate for motor slip and other factors within limits The speed control signal can be increased to compensate for low blower RPM and decreased to compensate for high blower RPM These speed control signal correction limits are also shown in Figure 5 4 NOTE The LMV3 will not attempt to correct the blower speed if the internal speed control is deactivated This is determined by parameter 661...

Page 119: ...t 9 5 VDC the analog input on the VFD is spanned so that 10 VDC 62 Hz This is done so that the blower will still achieve full 60 Hz blower speed at high fire on jobs where the blower is just large enough NOTE Most VFDs can be scaled to output 400 Hz or more Consult the blower and or motor manufacturer before over speeding the motor and blower since blower wheels and motor rotors can catastrophical...

Page 120: ... the standardized speed line are used These bands are 1 Neutral Band if the speed is within this band it is considered to be OK and no action is taken The width of this band is adjustable via parameter 662 and the range is 0 5 to 3 5 of the standardized speed Burner modulation is temporarily paused if blower speed is out of the neutral band 2 Near Zone Band if the speed is within this band the act...

Page 121: ...Standardized speed line Max Min Max Min Max Min sec RPM RPM RPM RPM RPM RPM RPM RAMP UP 0 55 1949 2020 1878 2091 1807 2303 1595 3 60 2126 2197 2055 2268 1984 2480 1772 6 65 2304 2375 2233 2446 2162 2658 1950 9 70 2481 2552 2410 2623 2339 2835 2127 12 75 2658 2729 2587 2800 2516 3012 2304 15 80 2835 2906 2764 2977 2693 3189 2481 18 85 3012 3083 2941 3154 2870 3366 2658 21 90 3190 3261 3119 3332 304...

Page 122: ...and adjustable timings for these bands to deal with some non linearity between the speed signal and the actual speed Assuming that the VSD blower is programmed to have a linear response to the speed signal the main source of non linearity is ramping the blower speed up and down The faster the ramp rates shorter times the more difficult it is for the VSD blower to keep a linear response This is mos...

Page 123: ...for PWM blowers and parameter 662 was set to 3 5 then the blower speed could deviate up to 227 RPM without causing the LMV3 to pause modulation Figure 5 7 below shows a VSD blower ramping down decelerating during operation The exact same principles that applied to the VSD blower ramping up apply to the ramp down however inertia effects and a lack of braking typically cause a more non linear respon...

Page 124: ...he LMV3 earlier in this section for guidance For brushless DC blowers PWM blowers Ensure that the PWM blower is a closed loop type meaning that it is utilizing an on board speed control properly tuned for that specific blower Ensure that the maximum closed loop speed that the PWM blower is programmed for is adequate for the application Ensure the wiring is correct paying particular attention to th...

Page 125: ...o ensure that parameter 644 is set to 3 b For PWM blowers that utilize the internal Hall Effect sensors set parameter 643 to 1 which indicates an equally spaced symmetric pulse pattern A symmetric pulse pattern is used by most PWM blower manufacturers The number of pulses per revolution varies by model and manufacturer but is typically 2 or 3 pulses per revolution Determine the number of pulses pe...

Page 126: ...662 2 5 and 663 4 5 assuming that it is safe to have this amount of fuel to air ratio control variance in the application Maximum values of 662 3 5 and 663 5 5 are occasionally needed for PWM blowers if they are not correctly programmed for the application 8 Set the pre purge position of the air actuator which is typically the same as the high fire position of the air actuator This is set with eit...

Page 127: ...ift the ignition speed of the VSD so that the ignition point can be made richer or leaner if desired The following pages detail how to set up and use the VSD speed shift on the LMV3 Prerequisites If the 4 20mA analog input is employed for speed shift it cannot be used for load control When the 4 20mA signal is employed for speed shift the firing rate command must be sent to the LMV3 in a different...

Page 128: ...VSD Shift High increase VSD speed parameter 548 for Fuel 0 parameter 568 for Fuel 1 b VSD Shift Low decrease VSD speed parameter 547 for Fuel 0 parameter 567 for Fuel 1 The range for VSD shift high is 0 to 25 and the range for VSD shift low is 0 to 15 The amount of speed shift is related to the analog signal according to Figure 5 8 below Figure 5 8 VSD Speed Shift Analog Signal to VSD Trim Looking...

Page 129: ...times out This delay can be used to give the O2 sensor time to obtain a valid reading after light off or it can be used to run the burner rich for a set period of time after ignition to heat up the burner mesh or combustion chamber The range is 0 to 255 seconds a VSD Shift Delay parameter 550 for Fuel 0 parameter 570 for Fuel 1 4 Set the Shift Limit Response This parameter determines the reaction ...

Page 130: ...on each start up so that the correct functionality of the PLC or other device can be verified by the LMV3 The analog input test consists of the PLC or other device sending a 10mA signal to the LMV3 in standby phase 12 and a 4mA signal during traveling to pre purge phase 24 for the first 2 seconds of pre purge phase 30 This would be accomplished by the PLC or other device reading the LMV3 phase ove...

Page 131: ...ignal shut down or lockout the burner etc If the PLC or other device that is sending the 4 20mA VSD speed shift command to the LMV3 has a PI Proportional Integral loop linking the speed shift command to a measured value and a set point PI windup is a concern If the PLC or other device is up against one of the LMV3 trim limits unknowingly PI windup is almost a certainty To address this issue additi...

Page 132: ...ues In particular the commanded speed and the actual speed can be plotted against one another real time and can be accurately reviewed to see where the largest deviations occur The combustion air pressure switch should be set by taking the VSD to 10 below the lowest anticipated low fire speed if low fire is 50 take the VSD to 40 and setting the switch to open at that point This should maximize the...

Page 133: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 134: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 135: ...nformation even though a lockout did not occur The fault history is stored in the 700 set of parameters The LMV3 stores the last 25 fault codes Parameter 701 displays information about the current status of the LMV3 Parameter 702 displays information about the most recent fault Parameter 703 displays information about the second most recent fault Parameter 725 displays information about the 24th m...

Page 136: ...riately If necessary increase the setting of parameter 213 2 Evaluation of air pressure Check the setting of parameter 235 335 This can only be set to 2 on pneumatic fuel train options 4 Air pressure on prevention of startup 20 Air pressure combustion pressure start prevention 68 Air pressure POC start prevention 84 Air pressure combustion pressure POC start prevention Note Diagnostic codes are ad...

Page 137: ...ve failed valve proving with the low gas switch doubling as the valve proving switch parameter 236 2 See diagnostic code 81 for corrective action 2 Valve proving not possible 3 Valve proving not possible An extraneous light flame signal present when input should be de energized fault occurred 1 Ensure that the source of light is not a flame If it is take corrective action immediately 2 Ambient lig...

Page 138: ...eck wiring to the fuel valves Ensure fuel valves are wired to the correct terminal see Section 2 for wiring diagrams With the manual shutoff valves closed ensure that the fuel valves are closing in the proper phase see Section 3 for sequence diagrams 3 Ensure POC switches are closing when the valve closes If this does not happen check wiring adjust switches or replace fuel valve actuator 1 POC clo...

Page 139: ...h input X5 01 2 opened causing a fault Check gas supply and open any manual shutoff valves Check the setpoint and wiring of the low gas pressure switch 1 Gas shortage prevention of startup The low gas pressure switch was not made by the end of phase 22 preventing the startup of the LMV3 See diagnostic code 0 for more corrective actions Any Pressure switch max Pmax POC A fault occurred related to t...

Page 140: ...OC start prevention 71 Safety loop burner flange open extraneous light air pressure POC start prevention 81 Safety loop burner flange open combustion pressure POC start prevention 83 Safety loop burner flange open extraneous light combustion pressure POC start prevention 85 Safety loop burner flange open air pressure combustion pressure POC start prevention 87 Safety loop burner flange open extran...

Page 141: ...g of the heavy oil direct start is correct 50 Any Internal error 51 Any Internal error 55 Any Internal error 56 Any Internal error 57 Any Internal error 58 Any Internal error Any Internal error No valid load controller source No valid 4 20 mA signal is present on terminal X64 This could be done on purpose to create a low fire hold Otherwise check wiring of 4 20 mA signal and ensure 4 20 mA source ...

Page 142: ...zed at the same time a fault will occur See diagnostic codes for more information 0 Invalid fuel selection Fuel 0 1 0 On an LMV36 neither fuel is selected Either select fuel 0 apply voltage to terminal X5 03 2 or fuel 1 apply voltage to terminal X5 03 3 1 Different fuel choice between the µCs 2 Different fuel signals between the µCs 3 Invalid fuel selection Fuel 0 1 1 On an LMV36 both fuels are se...

Page 143: ... that are undefined and reset the fault 3 Ignition position The ignition position for one of the actuators VSD is undefined Enter commissioning mode parameter 400 and check the settings of P0 Change any settings that are undefined and reset the fault 72 Any Internal error fuel air ratio control If the fault occurs continuously replace the LMV3 Any Internal error fuel air ratio control Position cal...

Page 144: ...he VSD The VSD should respond to the input signal in a linear fashion 3 Check speed sensor on motor for correct installation especially the gap between the sensor and the speed wheel 4 Ensure that the VSD and LMV3 are configured for the same analog signal 0 10 VDC 5 Re standardize the speed Be sure to check combustion after the re standardization 81 1 Interrupt limitation speed input The LMV3 has ...

Page 145: ...respond to the input signal in a linear fashion 3 Ensure that the VSD and LMV3 are configured for the same analog signal 0 10 VDC 5 Wrong direction of rotation 1 Check to see if the motor s direction of rotation is correct Reverse if necesssary 2 Check to see if the arrow on the speed wheel points in the correct direction of rotation Reverse if necessary 6 Unplausible sensor signals 1 Check the se...

Page 146: ...train Select a different fuel train via parameter 201 fuel 0 or 301 fuel 1 then attempt to standardize again 128 Running command with no preceding standardization A call for heat was received and the VSD is activated parameter 542 1 but no standardization has been performed Perform a standardization by setting parameter 641 to a 1 while in standby phase 12 or deactivate the VSD by setting paramete...

Page 147: ...ation phases 40 64 The detected speed was below the minimum operation speed parameter 669 00 or a VSD curve point was set below the setting of parameter 669 00 128 VSD speed exceeds maximum speed phase dependent 1 Standby phase 12 Ensure parameter 226 266 326 366 is set to a higher value than parameter 665 time outside near zone 2 Standby phase 12 Ensure parameter 669 01 maximum speed is set to a ...

Page 148: ... option parameter 201 301 that does not require a fuel actuator 8 Curve too steep in terms of ramp rate See error code 84 84 85 86 All SQM33 actuators must travel outside of their 0 90 operating range before starting up the burner in order to reference their position This fault means that the referencing was unsuccessful 1 Check the setting of parameter 601 fuel 0 and 608 fuel 1 Index 00 sets the ...

Page 149: ...utput of the air actuator If everything checks out okay replace the SQM33 actuator 1 Line interruption Check the wiring between the air actuator and LMV3 terminal X53 Fix the wiring error and reset the fault If no air actuator exists choose a fuel train option parameter 201 301 that does not require an air actuator 8 Curve too steep in terms of ramp rate See error code 84 16 Step deviation in comp...

Page 150: ...ull in fuel valve 2 X7 01 3 6 Relay does not pull in pilot valve X7 02 3 Any Internal error relay control If the fault occurs continuously replace the LMV3 3 Internal error relay control On software version V03 10 if this error occurs during standardization of the VSD temporarily deactivate the alarm in the case of start prevention set parameter 210 0 reset the fault and re standardize Otherwise i...

Page 151: ...voltage must be 102 132 VAC Once the mains voltage returns to the required range error code 112 will be triggered Reset the LMV3 Note After recovering from this fault the fault history will only show error code 112 and the error code 111 will not be shown 112 0 Mains voltage recovery No fault This code is triggered when mains voltage recovers after being too low see error code 111 113 Any Internal...

Page 152: ...ommand synchronization 130 Any Internal error EEPROM access timeout 131 Any Internal error EEPROM access page on abort 132 Any Internal error EEPROM register initialization If the fault occurs continuously replace the LMV3 133 Any Internal error EEPROM access request synchronization 134 Any Internal error EEPROM access request synchronization 135 Any Internal error EEPROM access request synchroniz...

Page 153: ...ccess error to parameter Restore_Complete Reset the fault and repeat the restore 246 10 Restore timeout when storing in EEPROM Reset the fault and repeat the restore 247 9 Data received are inconsistent Some data in the parameter set stored in the AZL23 is invalid so the restore could not be completed Reset the fault 248 8 Restore cannot at present be made Reset the fault and repeat the restore 24...

Page 154: ...fault and start the TUV test again Any Trim function Invalid analog value 1 Start prevention 2 Warning trim function temporarily disabled Any Trim function Invalid curve setting of VSD PWM blower The following equations set the limits on the curve settings for the VSD PWM blower Fuel 0 Parameter 669 00 parameter 547 curve point parameter 669 01 parameter 548 Fuel 1 Parameter 669 00 parameter 567 c...

Page 155: ...wed parameter 571 11 Fuel 1 Upper limit trim function The VSD trim signal was higher than allowed by the maximum trim limit parameter 568 for a time period longer than the maximum allowed parameter 571 Any Trim function Failed the analog input test A fault occurred during the analog input test See diagnostic codes for more information 0 Analog value standby If the analog input test is enabled the ...

Page 156: ...rror management If the fault occurs continuously replace the LMV3 200 OFF Any System error free The LMV3 displays this code when there are no current faults Any Prevention of startup 1 No operating mode selected 2 No fuel train defined 4 No curves defined 8 Standardized speed undefined 16 Backup restore was not possible 202 Any Internal error operating mode selection Make a valid selection of para...

Page 157: ...operation mode is not released for the LMV3 Select a different operation mode via parameter 201 301 240 Any Internal error If the fault occurs continuously replace the LMV3 Any Invalid parameterization Make a valid selection of parameter 277 377 then reset the fault 0 Invalid setting of parameter 277 Set parameter 277 to a valid value 1 Invalid setting of parameter 377 Set parameter 377 to a valid...

Page 158: ...LMV Series Technical Instructions Document No LV3 1000 SCC Inc Page 24 Section 6 Intentionally Left Blank ...

Page 159: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 160: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 161: ...for the communication interface are already set Number of data bits 8 Number of start bits 1 Number of stop bits 1 Transmission mode RTU The transmission mode used is RTU Remote Terminal Unit Data is transmitted in a binary format hexadecimal with 8 bits The LSB least significant bit is transmitted first ASCII operating mode is not supported Structure of data blocks All data blocks use the same st...

Page 162: ...f the checksum is transmitted first Example Data inquiry Reading 2 words from address 6 CRC16 0x24A0 0B 03 00 06 00 02 A0 24 CRC16 Reply CRC16 0x0561 0B 03 04 00 00 42 C8 61 05 Word 1 Word 2 CRC16 Mapping long values Byte High Byte Low Byte High Byte Low Word Low Word High Erroneous access to parameters of the LMV3 Reading When attempting to read non existing paramaters a substitute value will be ...

Page 163: ... is calculated as follows Character transmission time ms 1000 10 bits Baud rate And with the other data formats Character transmission time ms 1000 11 bits Baud rate Process Data inquiry from the master Transmission time n characters 1000 x bits Baud rate Identification code for end of data inquiry 3 5 characters 1000 x bits Baud rate Handling of data inquiry by the slave Reply from the slave Tran...

Page 164: ...ved by the master before making a new data inquiry It must always be observed even if the new data inquiry is made to some other device Communication during the internal slave handling time During the slave s internal handling time the master must not make any data inquiries Any inquiries made during this period of time will be ignored by the slave Communication during the slave s response time Du...

Page 165: ...ccurred wiring valid Modbus address etc Modbus addresses Overview table Function Address dec hex Number of words Data designation Access Data format Data type coding Range 03 04 0 0h 1 Burner control phase R U16 0 255 03 04 1 1h 1 Position of current fuel actuator R S16 Degrees 50 150 03 04 4 4h 1 Position of air actuator R S16 Degrees 50 150 03 04 8 8h 1 Manipulated variable VSD R S16 Percent 0 1...

Page 166: ...tch valve proving P LT via pressure switch min Pmin B0 B1 B2 Controller on off B11 Pressure switch max Pmax POC B3 B12 B4 B13 Air pressure switch LP B5 B14 B6 B15 B7 Pressure switch valve proving P LT Function Address dec hex Number of words Data designation Access Data format Data type coding Range 03 04 37 25h 1 Outputs R U16 Coding 0 inactive 1 active B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B...

Page 167: ... 2 OFF 0 2 R 03 04 W 06 16 45 2Dh 1 Preselected target output modulating multistage R W U16 Fire rate Modulating 0 100 Multistage 1001 1003 Invalid 32767 R 03 04 W 06 16 56 38h 2 Hours run fuel 0 resettable R W EEPROM S32 0 999999 h R 03 04 W 06 16 58 3Ah 2 Hours run fuel 1 resettable R W EEPROM S32 0 999999 h R 03 04 68 44h 2 Hours run unit live R S32 0 999999 h R 03 04 W 06 16 70 46h 2 Start cou...

Page 168: ...t 20 100 1001 1003 Invalid 32767 03 04 124 7Ch 1 Maximum output fuel 0 R U16 Fire rate limit 20 100 1001 1003 Invalid 32767 03 04 125 7Dh 1 Minimum output fuel 1 R U16 Fire rate limit 20 100 1001 1003 Invalid 32767 03 04 126 7Eh 1 Maximum output fuel 1 R U16 Fire rate limit 20 100 1001 1003 Invalid 32767 03 04 127 7Fh 1 Operation mode of burner fuel 0 R U16 1 27 03 04 128 80h 1 Operation mode of b...

Page 169: ...U16 U16 U16 U16 U16 U32 03 04 552 228h 8 Error history Current error 1 R U16 U32 03 04 744 2E8h 8 Error history Current error 24 R U16 U32 These parameters must not be continually written since they are stored in EEPROM which only permits a limited number of write accesses over its lifecycle 100 000 Note To avoid a conflict with the LMV5 Modbus parameters we recommend using the following parameter...

Page 170: ...ng the value 1 Data array Data types Type Physical range Internal range Resolution Conversion internally physically Percent 0 100 0 1000 0 1 10 Degrees 50 150 500 1500 0 1 10 Fire rate limit Modulating operation 20 100 Multistage operation 1001 stage 1 1002 stage 2 1003 stage 3 32767 invalid Modulating operation 200 1000 Multistage operation 1001 1003 32767 invalid Modulating operation 0 1 Multist...

Page 171: ... 41 Modbus mode local remote N A 42 Modbus breakdown time 142 43 Modbus operating mode in remote N A 45 Preselected target output 121 56 Hours run fuel 0 resettable 162 58 Hours run fuel 1 resettable 172 68 Hours run unit live 163 70 Startup counter fuel 0 resettable 164 72 Startup counter fuel 1 resettable 174 76 Startup counter total not resettable 166 78 Fuel volume fuel 0 167 80 Fuel volume fu...

Page 172: ...t to pilot 176 140 Operation mode of burner fuel 0 201 141 Operation mode of burner fuel 1 301 142 Switching cycles Revert to pilot 176 144 Lower range limit trim function fuel 0 547 145 Upper range limit trim function fuel 0 567 146 Lower range limit trim function fuel 1 548 147 Upper range limit trim function fuel 1 568 148 Input value analog input trim function 916 149 Current trim correction 9...

Page 173: ...LMV Series Technical Instructions Document No LV3 1000 SCC Inc Page 13 Section 7 Changeover of controller operating mode ...

Page 174: ...change to local operation For output preselection via the building automation and control system the controller on contact on the LMV3 must be closed The presetting after activation of remote operation is auto When the LMV3 is switched off the operating mode will be reset to the preselected mode Monitoring of Modbus timeout If communication between the Modbus and the LMV3 is interrupted the length...

Page 175: ...the LMV3 address for Modbus Baud rate of Modbus interface Setting the Baud rate is made via parameter 146 This parameter specifies the transmission rate for the Modbus interface The Baud rate is stored in nonvolatile memory in the LMV3 Changes to parameter 146 can only be made via the LMV3 not via Modbus Parameter Default Range Description 146 1 0 1 Sets the baud rate of the Modbus port X92 0 9600...

Page 176: ...re rate when Modbus communication is interrupted is made via parameter 148 fuel 0 and 149 fuel 1 The output set with this parameter is approached when in remote operation communication is interrupted for longer than the period of time set by parameter 142 If this output is set invalid and communication is interrupted the system will deliver the output set on the LMV3 The fire rate is stored in non...

Page 177: ... to parameters Also the simultaneous setting of a parameter from the AZL2 and the Modbus master must be avoided since it would not be possible to predict who is granted the access right Write access via Modbus is possible at any time independent of the AZL2 or ACS410 PC tool Error Handling In the event of erroneous telegrams CRC errors etc the AZL2 does not send an exception code refer to Modbus d...

Page 178: ...Technical Instructions LMV Series Document No LV3 1000 Section 7 Page 18 SCC Inc Intentionally Left Blank ...

Page 179: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 180: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 181: ... inputs and outputs as well as the LMV3 operating state 5 Setting and visualization of fuel air ratio curves The following pages will cover the software installation and how to connect the LMV3 to a PC as well as explain how to utilize the basic capabilities of the ACS410 software including parameter sets startup reports trending and the status screen Since most people prefer to use the AZL23 to s...

Page 182: ...der where the ACS410 software will be installed The default folder is C Program Files x86 Siemens ACS410 Click Next e Select the folder where the ACS410 software shortcuts will be installed in the Start Menu The default folder is ACS410 Click Next f Select the checkbox if an ACS410 desktop icon is desired Click Next g Review the installation choices If everything looks correct click Install h The ...

Page 183: ...410 30 interface module 2 Once the interface module is acquired the LMV3 can be connected to the PC Unplug the AZL23 from the LMV3 Connect the RJ11 plug of the OCI410 interface module into the BCI port on the LMV3 Connect the USB plug of the OCI410 interface module into a USB port on the PC The ACS410 software should automatically identify which COM port the OCI410 interface module is plugged into...

Page 184: ...le name to something more job specific Additionally information can be added for description device number burner type and burner serial number Once all of the relevant information has been entered click OK 4 After about a minute a box should appear stating that the backup was successful and the backup file should now be listed on the screen The default location for storing parameter sets is C Pro...

Page 185: ...will determine the behavior of the LMV3 Be sure that the correct file is selected 3 A prompt will appear asking to confirm that the proper file was selected Click Yes After about a minute a box should appear stating that the upload was successful If an error message is returned see below for the cause of the error Burner ID The burner ID of the data set stored on the PC does not match the burner I...

Page 186: ... the startup report Then click on Load in the lower right corner 4 The Info Service tab will now display all of the user level parameters and the fault history of the selected parameter set The Parameters tab will display all of the service and OEM level parameters of the selected parameter set 5 Select the File dropdown menu and click on Report Enter a description of the parameter set if desired ...

Page 187: ...en is shown below in Figure 8 1 Figure 8 1 The ACS410 Trending Screen 2 All of the parameters available to be trended are listed in the lower left corner Double click on any parameter or use the button to select it as a parameter to be trended A maximum of 9 parameters can be trended at one time 3 Use the X column to select a multiplier other than 1 Click on the color square next to the X column t...

Page 188: ...eated in step 5 Trending data is stored in the following location C Program Files x86 Siemens ACS410 tn Each set of trending data creates two files one with a unl format and one with a dtd format Both files are necessary if the trend is to be viewed at a later time through the ACS410 software 8 To view a previously saved trend through the ACS410 software click Login at the top of the screen Click ...

Page 189: ...puts and outputs as well as the operating state of the LMV3 The following steps outline the procedure for viewing the ACS410 status screen 1 Open the ACS410 software and connect to the LMV3 at any password level 2 Once connected click on the Status tab at the top of the screen The status screen will appear detailing the operating state of the LMV3 The status screen looks like Figure 8 2 below Figu...

Page 190: ...Technical Instructions LMV Series Document No LV3 1000 Section 8 Page 10 SCC Inc Intentionally Left Blank ...

Page 191: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 192: ...Section 1 Overview Section 2 Wiring Section 3 Parameters Section 4 Commissioning Section 5 VSD Section 6 Troubleshooting Section 7 Modbus Section 8 ACS410 Appendix A Application Guide ...

Page 193: ...ions Document No LV3 1000 SCC Inc Page 1 Appendix A Appendix A LMV3 Application Guide Description The LMV3 Application Guide includes programming wiring and operation examples of the control system for the most common applications ...

Page 194: ... with Analog Output 10 Procedure Steam Boiler with an RWF55 with 3 position Output LMV37 only 11 Procedure Hot Water Boiler with an RWF55 with 3 position Output LMV37 only 12 Operation 13 Example 13 Pilot Valve Proving Introduction 14 Procedure 14 Option 1 On Startup with SKP25 s on both the Pilot and Main Gas Trains 16 Sequence of Operation 17 Important Notes 17 Option 2 On Startup SKP25 on the M...

Page 195: ...A Table of Contents continued Purge Proving Introduction 22 Procedure 22 Operation 23 Revert to Pilot LMV37 only Introduction 24 Procedure 24 Sequence of Operation 25 Operation Example 27 Important Notes 28 Stack Damper Introduction 29 Procedure 29 Operation 30 Important Notes 30 ...

Page 196: ...is desired to have the fresh air damper fully open before the combustion fan turns on and to leave the damper open until the combustion fan turns off again The following procedure will describe how to wire a fresh air damper to the LMV3 so that the damper is open anytime the combustion fan is on Procedure 1 Wire the LMV3 RWF5x load controller and fresh air damper as shown in Figure 1 Figure 1 LMV3...

Page 197: ...minal 1P will be energized as long as the burner on off switch is on Coil CR 1 will be energized closing the CR 1 contact As long as the LMV3 is not in alarm CR 3 contact is closed the fresh air damper will begin driving open 3 Once the fresh air damper drives fully open the fresh air damper end switch will close and the burner will turn on 4 The fresh air damper will remain open until the fan tur...

Page 198: ...oad of the boiler based on steam pressure Control the hot standby based on shell temperature The procedure and operation for using the RWF55 for both load control and hot standby is described below Procedure 1 Wire the RWF55 to the LMV3 as shown in Figure 2 Figure 2 LMV3 Hot Standby Wiring 2 On an LMV37 only Place a jumper between terminals X5 03 2 and X5 03 4 On an LMV36 only Set parameter 204 to...

Page 199: ...based ConF AF HYSt burner on off for hot standby temperature based ConF OutP SiGn 1 Operation 1 When the hot standby switch is set for hot standby the LMV3 system is in hot standby mode The burner will turn on and off based on the temperature limits set in the RWF55 controller for hot standby ConF AF Since the signal to LMV3 terminal X64 1 is broken by the hot standby switch the LMV3 stays at low ...

Page 200: ...With an RWF55 a low fire hold is accomplished by breaking the increase load signal to the LMV3 The wiring and setup for four cases will be described Steam boiler with an RWF55 with analog output Hot water boiler with an RWF55 with analog output Steam boiler with an RWF55 with 3 position output LMV37 only Hot water boiler with an RWF55 with 3 position output LMV37 only The wiring and setup of the R...

Page 201: ...t parameter 204 to 2 If 2 is not an option older LMV36s set parameter 204 to 0 2 Set the following parameters in the RWF55 ConF Inp Inp1 SEn1 signal type of pressure sensor ConF Inp Inp1 SCL1 0 ConF Inp Inp1 SCH1 high end of the range of the pressure sensor ConF Inp Inp3 SEn3 type of RTD being used for a belly sensor ConF Inp Inp3 dF3 0 ConF Cntr CtYP 2 ConF AF FnCt 11 ConF AF AL temperature to en...

Page 202: ...o 2 If 2 is not an option older LMV36s set parameter 204 to 0 1 Set the following parameters in the RWF55 ConF Inp Inp1 SEn1 type of RTD being used for temperature sensor ConF Cntr CtYP 2 ConF AF FnCt 7 ConF AF AL temperature to enable low fire hold ConF AF HYSt deadband around low fire hold temperature ConF OutP FnCt 4 ConF OutP SiGn 1 2 Wire the LMV3 and RWF55 as shown in Figure 4 Figure 4 Low F...

Page 203: ...rs 1 Set the following parameters in the RWF55 ConF Inp Inp1 SEn1 signal type of pressure sensor being used ConF Inp Inp1 SCL1 0 ConF Inp Inp1 SCH1 high end of the range of the pressure sensor ConF Inp Inp3 SEn3 type of RTD being used for a belly sensor ConF Inp Inp3 dF3 0 ConF Cntr CtYP 1 ConF AF FnCt 11 ConF AF AL temperature to enable low fire hold ConF AF HYSt deadband around low fire hold tem...

Page 204: ... following parameters in the RWF55 ConF Inp Inp1 SEn1 type of RTD being used for temperature sensor ConF Cntr CtYP 1 ConF AF FnCt 7 ConF AF AL temperature to enable low fire hold ConF AF HYSt deadband around low fire hold temperature 2 Wire the LMV37 and RWF55 as shown in Figure 6 Figure 6 Low Fire Hold via 3 position Output on a Hot Water Boiler See page 19 for an example of the low fire hold ope...

Page 205: ...contact K6 opens and prevents the LMV3 from increasing the firing rate This is the case for either analog or 3 position output from the RWF55 2 Once the boiler warms up above the low fire hold threshold AL 1 2 HYSt contact K6 closes and the burner modulates according to the PID settings of the RWF55 Example Low fire hold threshold settings AL 180 HYSt 10 Figure 7 Behavior of Contact K6 when Using ...

Page 206: ...valve proving type can be set in the LMV3 using parameter 241 For Option 1 or Option 2 this must be set to a 1 valve proving on startup only For Option 3 this must be set to a 3 valve proving on both startup and shutdown 2 The times for each of the four stages of valve proving need to be set To do so use the following parameters in the LMV3 Parameter 242 is the time that the downstream valve is en...

Page 207: ...essure switch in PSIG should be set for half of Pi Patm Atmospheric pressure downstream of both valves in PSIA typically 14 7 PSI V Volume between the gas valves to be tested in ft3 Qleak Allowable leakage rate in ft3 hr For Option 3 these times should be calculated independently for the pilot and main valves and the larger of the calculated times should be used as the parameter setting 3 Paramete...

Page 208: ...ctions LMV Series Document No LV3 1000 Appendix A Page 16 SCC Inc Pilot Valve Proving continued Option 1 On Startup with SKP25 s on both the Pilot and Main Gas Trains Figure 8 Option 1 Piping and Electrical Schematics ...

Page 209: ...on position The ignition transformer output X4 02 3 energizes thereby energizing the CR 2 coil and latching the CR 1 coil from the power supplied from X6 03 3 At the same time one of the CR 1 contacts opens thereby closing the PVLT and closing the PVLT POC switch Note that the PVLT POC switch must be closed before the pilot valves open 5 The LMV3 continues light off and runs as normal with the CR ...

Page 210: ... LMV Series Document No LV3 1000 Appendix A Page 18 SCC Inc Pilot Valve Proving continued Option 2 On Startup SKP25 on the Main Gas Train Solenoid Valves on the Pilot Train Figure 9 Option 2 Piping and Electrical Schematics ...

Page 211: ...lf of the inlet pressure 4 The LMV3 drives to ignition position The ignition transformer output X4 02 3 energizes thereby energizing the CR 2 coil and latching the CR 1 coil from the power supplied from X6 03 3 At the same time one of the CR 1 contacts opens thereby closing the PVLT and closing the PVLT POC switch Note that the PVLT POC switch must be closed before the pilot valves open 5 The LMV3...

Page 212: ...ions LMV Series Document No LV3 1000 Appendix A Page 20 SCC Inc Pilot Valve Proving continued Option 3 Pilot Valve Proving on Startup and Main Valve Proving on Shutdown Figure 10 Option 3 Piping and Electrical Schematics ...

Page 213: ... 3 energizes thereby energizing the CR 2 coil and latching the CR 1 coil from the power supplied from X6 03 3 The main gas valve V1 terminal X8 02 1 is connected to main gas valve V1 and the main gas valve V2 terminal X7 01 3 is connected to main gas valve V2 The pilot valve terminal X7 02 3 is connected to both PV1 and PV2 Also PS VP1 is now connected to the valve proving terminal X9 04 2 5 The L...

Page 214: ...fied and the purge begins An end switch on the air damper Once the air damper has moved to its fully open position the end switch closes and the purge begins The following procedure for purge proving on the LMV3 uses an additional two pole relay with either a differential pressure switch or an air damper end switch Procedure The following procedure uses either a differential pressure switch or an ...

Page 215: ...put X3 02 1 must be energized or the LMV3 will lockout 3 Once the proving switch closes relay CR 1 energizes and the two normally open contacts close 4 The contact wired in parallel with the proving switch latches power to relay CR 1 as long as the blower is on 5 The other contact wired to line X3 02 2 completes the circuit to the combustion air pressure input X3 02 1 provided that the combustion ...

Page 216: ... that allows the burner to re light the pilot and close the main gas valves V1 and V2 This is done for two key reasons Eliminating energy losses due to postpurge and prepurge Minimizing the time from a demand signal to burner heat production Procedure 1 Wire the LMV3 and RWF55 load controller as shown below in Figure 12 Figure 12 LMV3 RWF55 Revert to Pilot Wiring ...

Page 217: ...rameters in the LMV37 controller For more information see Section 3 of this document Parameter 191 1 Parameter 192 Minimum pilot on time Parameter 193 Maximum pilot on time Sequence of Operation 1 The LMV37 is in standby 2 Pressure or temperature falls The contact between 6N and 6P on the RWF55 closes energizing terminal X5 03 2 The LMV37 is still in standby 3 Pressure or temperature continues to ...

Page 218: ...aximum pilot on time is reached c The pressure or temperature climbs enough so that the contact between terminals 1N and 1P on the RWF55 opens de energizing terminal X5 03 1 If Option a occurs The LMV37 will proceed with a normal light off sequence except that it will start the sequence at the end of the pilot stabilization time phase 44 and then progress to normal operation phase 60 If Option b o...

Page 219: ...nstructions Document No LV3 1000 SCC Inc Page 27 Appendix A Revert to Pilot LMV37 only continued Operation Example Critical RWF55 settings for operation example OPr SP1 90 PArA HYS1 4 PArA HYS3 8 ConF AF AL 3 ConF AF HYSt 4 ...

Page 220: ...to protect pilot burners that may not be rated for continuous operation 4 The purpose of the minimum pilot on time is to provide a deadband so that the burner does not constantly revert to pilot and then light off the main burner again repeatedly 5 Once a revert to pilot sequence is initiated the entire revert to pilot sequence must be followed through including the minimum pilot on time 6 It is n...

Page 221: ... to be open during boiler operation Typically it is desired to have the stack damper fully open before the combustion fan turns on and to leave the damper open until the combustion fan turns off again The following procedure will describe how to wire a stack damper to the LMV3 so that the damper is open anytime the combustion fan is on Procedure 2 Wire the LMV3 RWF5x load controller and stack damp...

Page 222: ...ose Terminal 1P will be energized as long as the burner on off switch is on Coil CR 1 will be energized closing the CR 1 contact As long as the LMV3 is not in alarm CR 3 contact is closed the stack damper will begin driving open 3 Once the stack damper drives fully open the stack damper end switch will close and the burner will turn on 4 The stack damper will remain open until the fan turns off On...

Page 223: ...Intentionally Left Blank ...

Page 224: ...erliner Ring 23 76437 Rastatt Germany SCC Inc 1250 Lunt Avenue Elk Grove Village IL 60007 USA Telephone 1 224 366 8445 www scccombustion com Printed in USA Siemens Industry Inc 05 2015 Technical Instructions Document No LV5 1000 July 10 2015 ...

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