Honeywell BCU 370 Technical Information Download Page 22

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BCU 370 · Edition 01.19

Function

After controlled shut-down, the

post-purge time t

starts to elapse

and then the butterfly valve moves
to the Ignition position in prepara-
tion for the next start.
NOTE: Quick start is not allowed for
units with FM or CSA approval.

Start-up with

signal

Waiting time t

Fan run up time t

(P20)

Switch-on delay time t

running (P22)

Start-up position/standby

Controlled shut-down

via

signal

Flame proving period t

FS1

running for burner/pilot burner (P13)

Flame proving period t

FS2

running for main burner (P15)

Safety time t

SA2

running for main burner (P14),

V3 opens

Controller enabler signal delay time t

(P29)

Controller enable signal

Post-purge time t

running (P19)

If parameter P27 = 0:

V2 is switched off

Butterfly valve moves to Open position

Butterfly valve moves to Ignition position

Safety time t

SA1

running for

burner/pilot burner (P12),

V1 and V2 open

Pre-ignition time t

running (P21)

Ignition activated

Summary of Contents for BCU 370

Page 1: ... of unlimited capacity in intermittent or continuous operation Control of fan and butterfly valve Simple system set up thanks to optional tightness control and integrated ignition unit Easy start up and maintenance thanks to Manual operating mode Optionally available with integrated fieldbus interface for simple wiring ...

Page 2: ... related control signals 32 3 4 2 BCSoft 33 3 4 3 Configuration master slave procedure 33 3 4 4 Addressing 33 3 4 5 Network technology 34 3 4 6 Configuration 34 3 4 7 Bus communication 34 3 5 Program status 36 3 6 Fault message blinking 37 3 6 1 Reaction to process faults 38 4 Parameters 40 4 1 Scanning the parameters 42 4 2 Flame control 42 4 2 1 Burner flame signal 42 4 2 2 Burner switch off thr...

Page 3: ...any remote resets 67 6 6 Protecting the ignition unit from overload 68 6 7 Wiring 68 6 7 1 Single electrode operation with external ignition unit 68 6 8 BCU switched off 68 6 9 Note on EC type examination or CSA and FM approval 69 6 10 Contact fuses 69 6 11 Installation 69 6 12 Protective circuits 69 6 13 BCSoft 69 7 Flame control 70 7 1 with flame rod 70 7 2 with UV sensor 70 8 Accessories 71 8 1...

Page 4: ...d Post purge occurs after the end of burner operation The burner control unit BCU 370 monitors the gas and air pressure An optionally integrated tightness control function checks the valves with an external gas pres sure switch Programmability by means of the optical interface and BCSoft PC software guarantees optimum adaptation to the relevant application Adjustable start up attempts and automati...

Page 5: ...anual start of the burner and setting of the butterfly valve position inde pendently of the central control system The BCSoft operator control and setting software provides a pow erful tool for commissioning and servicing To reduce the installation and wiring costs Honeywell Kromschröder offers an optional Profibus DP interface to transfer the activation signals and feedbacks ...

Page 6: ...cations example 1 1 1 Modulating controlledforced draught burner The BCU 370 controls the fan and moves the butterfly valve to pre purge and ignition position It issues the enable signal to the control sys tem after start up of the burner 1 1 2 Modulating controlledforced draught burner with tightness control In addition to controlling the forced draught burner the burner control unit also monitor...

Page 7: ...G M 22 DG 11 DG pu 2 U V S 29 31 30 26 28 90 0 0 90 Application 1 1 3 Modulating controlledforced draught burner with pilot burner and tightness control A pilot burner ignites the main burn er and is switched off during the main burner s safety time Parameter 27 0 V2 is OFF i e in terrupted pilot burner during burner operation ...

Page 8: ... Controlling the BCU and the butterfly valve via PROFIBUS DP The BCU 370 B1 3 receives posi tioning information for the butterfly valve from the temperature control ler via the PROFIBUS DP and acti vates the butterfly valve following controller enable BUS L1 L1 26 28 25 BCU 370 B1 M ϑ ϑ Profibus DP 29 31 32 30 90 0 0 90 3PS PLC Temperature controller BUS L1 L1 BCU 370 B1 3 M ϑ ϑ Profibus DP 90 0 0...

Page 9: ...uant to NFPA 86 www approvalguide com ANSI CSA approved American National Standards Institute Canadian Standards Association Class number 3335 01 and 3335 81 UL listed USA and Canada Underwriters Laboratories UL 372 Primary Safety Controls for Gas and Oil fired Appliances www ul com Tools at the bottom of the page On line Certifications Directory AGA approved AGA Australian Gas Association Approva...

Page 10: ...3 24 25 26 27 28 29 30 31 32 L1 L1 N L2 PE N V2 V3 DL DG min DG max M 3PS ϑ p p p I Z 90 0 0 90 Function 3 Function 3 1 Connection diagrams 3 1 1 BCU 370 The drawing shows the BCU 370 I1 with integrated ignition unit ionization control and double electrode operation For cable selection and wiring see page 66 Project planning information For the explanation of symbols see page 77 Leg end ...

Page 11: ...BCU 370 I2 Z Z 3 2 1 UVS N 13 14 15 16 PE BCU 370 I3 Z Z 3 2 1 UVS Function BCU 370 I1 for 120 V and 230 V UV control BCU 370 I2 for 230 V ignition by electrode to electrode BCU 370 I3 for 120 V ignition by electrode to electrode with centre tap for secondary grounding ...

Page 12: ... D3 DG p pe 2 N 13 14 15 16 PE BCU 370 I Z Function BCU 370 with single electrode operation which re quires an external ignition transformer TZI or TGI BCU 370 D3 gas pressure switch DG for tightness control BCU 370 with external ignition transformer e g TZI or TGI ...

Page 13: ...4 3 2 1 Function BCU 370 U1 with UV flame detector UVC 1 for continu ous operation Use 5 core connection cable including a PE wire and complying with local regulations The UVC 1 is grounded using a PE wire connection which is galvanically connected to the housing ...

Page 14: ...E S1 S2 r 90 0 0 90 90 0 0 90 Function 3 1 2 BCU 370 with actuator IC 20 The closed contact 90 0 of the external three point step controller 3PS can be connected to termi nal 26 or 27 Terminal 26 the controller operates between the open and ignition positions Terminal 27 the controller operates between the open and closed positions ...

Page 15: ...e Min position This connection is used if the valve position to be ap proached is below the Ignition position Standard wiring of BCU 370 and BCU 370 B1 without three point step control function Valve position Activation of terminal Upper end position Open 28 Lower end position Closed 27 Lower end position Min Via separate limit switch Lower end position Ignition 26 ...

Page 16: ... 15 16 24 25 26 27 28 29 30 31 32 L1 L1 N L2 PE N V2 V3 DL DG min DG max M 3PS p p p I Z BCU 370 B1 PROFIBUS DP 2B 2A 1B 1A OFF ON 90 0 0 90 Function 3 1 4 BCU 370 B1 with PROFIBUS DP Function see page 32 PROFIBUS DP For cable selection and wiring see page 66 Project planning information For the explanation of symbols see page 77 Legend ...

Page 17: ...181 2 Floating contact Signalling contact for operating signals Contact between terminals 17 and 18 closes once the operating signal has been received from the burner 19 201 2 Signalling contact for faults Contact between terminals 19 and 20 closes in the event of a BCU fault signal 211 2 V AC input Start up signal Signal applied BCU start no signal BCU stop 221 2 Controlled air flow Signal applie...

Page 18: ...1 V AC output Capacity control Connection for capacity control using an actuator 32 Safety circuit input Feedback from actuator frequency converter Connection for the position feedback signal from the actuator 1 BCU B1 not fitted non functional 2 BCU B1 3 not fitted non functional ...

Page 19: ...k before con tinuing the program sequence Now the BCU activates pre ignition tVZ and then opens valves V1 and V2 for the pilot burner The ignition time tZ is constant After the flame proving period for the pilot burner tFS1 valve V3 opens to ignite the main burner H0 04 05 00 H0 01 A1 P1 A2 03 Switch on BCU 370 Start up with ϑ signal In the event of fault signal reset Fan run up time tGV P20 Switc...

Page 20: ...ed As soon as the start up signal ϑ is switched off post purge starts The butterfly valve moves to the Igni tion position during this time then to the Closed position Next the BCU rests in the start up position standby 06 07 08 00 A0 H8 08 P9 Start up position standby Controlled shut down via ϑ signal Butterfly valve moves to Closed position Flame proving period tFS2 running for main burner P15 Sa...

Page 21: ... may have elapsed and the BCU must have been switched on In contrast to the normal start up in the case of a quick start program steps A1 P1 and A2 will be omit ted If there is no pilot burner program steps 06 und 07 will also be omit ted H0 05 06 07 00 H0 02 01 04 03 Start up with ϑ signal Waiting time tW Fan run up time tGV P20 Switch on delay time tE running P22 Start up position standby Flame ...

Page 22: ...art is not allowed for units with FM or CSA approval 07 08 00 H8 08 P9 A1 A2 Start up position standby Controlled shut down via ϑ signal Flame proving period tFS2 running for main burner P15 Controller enabler signal delay time tRF P29 Controller enable signal Post purge time tPN running P19 If parameter P27 0 V2 is switched off Butterfly valve moves to Open position Butterfly valve moves to Ignit...

Page 23: ...ave been switched on After the switch on delay time tE the butterfly valve moves to the Ig nition position The Ignition position is always approached from the top Therefore the butterfly valve moves to the Open position first H0 05 06 00 H0 01 A1 A2 04 03 02 Start up with ϑ signal Fan run up time tGV P20 Waiting time tW Switch on delay time tE running P22 Start up position standby Flame proving pe...

Page 24: ...U rests in the start up position standby NOTE Quick start is not allowed for units with FM or CSA approval 06 07 08 00 A0 H8 08 P9 Start up position standby Controlled shut down via ϑ signal Butterfly valve moves to Closed position Flame proving period tFS2 running for main burner P15 Safety time tSA2 running for main burner P14 V3 opens Controller enabler signal delay time tRF P29 Controller enab...

Page 25: ...position After the waiting time tW the BCU activates pre ignition tVZ and then opens valves V1 and V2 for the pilot burner The ignition time tZ is constant After the flame proving period for the pilot burner tFS1 valve V3 opens to ignite the main burner H0 04 05 06 00 H0 01 A1 A2 03 02 Switch on BCU 370 Start up with ϑ signal In the event of fault signal reset Fan run up time tGV P20 Switch on del...

Page 26: ...ϑ is switched off post purge starts The butterfly valve moves to the Igni tion position during this time then to the Closed position Next the BCU rests in the start up position standby NOTE Quick start is not allowed for units with FM or CSA approval 06 07 08 00 A0 H8 08 P9 Start up position standby Controlled shut down via ϑ signal Butterfly valve moves to Closed position Flame proving period tFS...

Page 27: ...ck the BCU 370 starts the fan and opens the but terfly valve to the Open position The pressure switch for air DL monitors the air pressure If the start up signal J is applied during controlled air flow the burner is started If the elapsed controlled air flow time is at least as long as the set pre purge time the burner starts immediately after the Ignition position has been reached If it is shorte...

Page 28: ...s control is to identify an inadmissible leak on one of the gas solenoid valves and to prevent burner start The other gas solenoid valve continues work ing properly and takes over the safe shut off of the gas supply The test takes place during pre purge The fan runs and the air pressure opens the air gas ratio control GIK In the case of quick start parameter 06 0 the test takes place after burner ...

Page 29: ...he gas solenoid valve V2 on the burner side the pipe to the burner must be open so that the space between valves V1 and V2 can be vented The pressure switch DG moni tors the pressure between the two valves It must be set to half of the inlet pressure pu 2 in order to check both valves with equal sensitivity In pilot main burner systems with three gas solenoid valves V2 and V3 are checked simultane...

Page 30: ...ce Then the measure ment time tM starts to elapse If no interspace pressure can be measured after this time V1 is also tight Both valves have thus been checked If no interspace pressure pZ can be measured after the waiting time tW V1 is tight Then V1 is opened for 3 seconds to fill the space between the valves Then the measurement time tM starts to elapse If a pressure can be measured in the inter...

Page 31: ...n 01 19 31 Function Leakage is indicated by 36 for the first valve and 37 for the second V1 V2 pu pz START tW pZ pu 2 tL 3 s tM tL 3 s tM pZ pu 2 TEST V2 I 0 V2 V2 OK V2 0 I pZ pu 2 V1 OK V1 V2 OK V1 I 0 V1 0 I V1 OK ...

Page 32: ...2 core shielded cable as standard The bus system transfers the control signals for start ing resetting and for controlling the air valve to purge the furnace or kiln or for cooling in start up position and heating during operation from the control system PLC to the BCU B1 In the opposite direction it sends operating status the level of the flame signal and the current program status 3 4 1 Safety r...

Page 33: ...e distributed stations slaves on the ba sis of a defined cycle This includes for instance the PLC PC CNC or VME systems with which the PROFI BUS DP is operated DP Master Class 2 DPM2 DPM2 devices are programming project planning or operator control devices They are used for configu ration and commissioning of the system or for system operation and visualization in ongoing operation DP slaves The d...

Page 34: ...count To allow for simple and standardized planning the param eters of the BCU B1 have been summarized in a so called device master data file GSD The file structure is standard ized so that it can be read by the planning devices of differ ent manufacturers The GSD file can be downloaded from www docuthek com once you have registered The steps required to copy the file are described in the instruct...

Page 35: ...500 kbit s The max range per segment depends on the baud rate Baud rate kbit s Range m 93 75 1200 187 5 1000 500 400 1500 200 The specified ranges can be increased by using repeat ers No more than three repeaters should be connected in series The specified ranges relate to bus cable type A two core shielded and twisted e g Siemens Order No 6XV1830 0EH10 or Lapp cable unitronic Order No 2170 220T ...

Page 36: ... position check P1 Pre purge time tPV A2 Butterfly valve moves to Ignition position 02 Waiting time tW 03 Pre ignition time tVZ 04 1st safety time on start up tSA1 05 1st flame proving period tFS1 06 2nd safety time on start up tSA2 07 2nd flame proving period tFS2 H8 Controller enable signal delay time 08 Operation Controller enable H0 Waits for switch on delay or min pause time C1 Controlled air...

Page 37: ...erlock failure 50 Permanent remote reset 52 Timing cycle too short 53 DGmin oscillating 55 Bus module error E Bus fault P Open Close set simultaneously 56 Fault Valve feedback 35 Tightness control V1 leaking 36 Tightness control V2 V3 leaking 37 Fault Air monitor break contact check 0 Fault Air monitor make contact check 1 Fault Air supply during pre purge P Fault Air supply in program step X X Fa...

Page 38: ...n Signal terminal Signal status During program step Controlled shut down Timeout 25 s Immediate fault lock out Safety shut down Start up attempts 1 Restart 2 Fault message DGmax 11 drops XX All X DGmin 9 drops XX All except tSA1 tSA2 4 X not pending after tSA1 04 tSA1 4 4 not pending after tSA2 06 tSA2 4 6 DL 7 pending 0 no flow state check 0 not pending 1 Operating position check 1 drops P1 Pre p...

Page 39: ...nding 0 no flow state check 01 pending 1 Operating position check 01 pending P1 Pre purge time 01 pending A2 Valve moves to Ignition position 01 pending 02 Waiting time 01 not pending after tSA1 04 tSA1 04 drops 05 tFS1 05 drops 06 tSA2 06 drops 07 tFS2 07 drops H8 Controller enable waiting time 08 drops 08 Operation 08 1 According to parameter 07 If the last start up attempt fails a fault lock ou...

Page 40: ...t lock out 1 Restart 0 Safety time during operation tSB 09 1 2 s 1 s Minimum operating time tB 10 0 250 s 0 s Minimum burner pause time tBP 11 0 250 s 0 s 1st safety time on start up burner pilot burner tSA1 12 2 3 5 10 s 5 s 1st flame proving period burner pilot burner tFS1 13 0 2 5 10 20 s 2 s 2nd safety time on start up main burner tSA2 14 0 2 3 5 10 s 3 s 2nd flame proving period main burner t...

Page 41: ...ation 27 0 Off 1 On 0 Quick start starts in 28 0 Ignition position 1 Closed position 0 Controller enable signal delay time tRF 29 0 10 20 30 250 s 0 s User defined password 30 0000 9999 XXXX 2 Bus control activation 31 0 Off 1 On 1 Bus control limitation 32 0 Closed position 1 Low position 2 Ignition position 2 The last 10 fault messages 81 90 XX 1 Adjustable using BCSoft software and a PC opto ad...

Page 42: ...r UV sensor 4 2 1 Burner flame signal Parameter 01 Displays the flame signal in μA The BCU measures the flame signal and assesses whether there is a flame on the basis of the switch off threshold 4 2 2 Burner switch off threshold Parameter 02 The sensitivity at which the burner control unit detects a flame can be set using parameter 02 As soon as the measured flame signal falls below the set value...

Page 43: ...t the UV sensor Parameter 17 0 unlimited burner operation Parameter 17 1 an automatic restart is activated once every 24 hours The restart begins with pre purge parameter 06 Pre purge on each start up 1 or starting the burner in the Ignition position parameter 06 Pre purge on each start up 0 The time starts each time the start up signal ϑ is applied Since the BCU 370 interrupts burner operation au...

Page 44: ...p attempts Parameter 07 1 one start up attempt If a safety shut down takes place during start up e g on account of a flame signal failure a fault lock out oc curs once the time tSA has elapsed The display blinks and shows the cause of the fault Parameter 07 2 4 2 4 start up attempts If several start up attempts are set at the works and if the BCU performs a safety shut down during start up it clos...

Page 45: ...elay times tE prevents the fans from starting at the same time and reduces the load on the power supply 4 3 4 Pre ignition time tVZ Parameter 21 88 ϑ t 21 24 1 16 3 30 29 31 13 19 20 4 V1 6 V3 5 V2 17 18 11 DGmax 9 32 DGmin 7 DL 90 0 0 90 tSA1 06 H0 05 00 tFS1 tE 01 tGV P1 A2 tPV tZ1 03 04 tVZ H8 07 tFS2 A1 08 tRF tSA2 The ignition unit is activated The ignition spark can stabilize in the air flow...

Page 46: ...lves are closed The BCU carries out up to 3 further start up at tempts depending on how parameter 07 Burner start up attempts has been set The setting of safety time tSA1 is to be determined on the basis of the burner capacity the type of control and the relevant application standard e g EN 746 2 EN 676 NFPA 85 or NFPA 86 4 3 6 1st flame proving period burner pilot burner tFS1 Parameter 13 88 ϑ t ...

Page 47: ... BCU performs a safety shut down Valves V1 V2 and V3 are closed The BCU carries out up to 3 further start up attempts depending on how parameter 07 Burner start up attempts has been set The setting of safety time tSA2 is to be determined on the basis of the burner capacity the type of control and the relevant application standard e g EN 746 2 EN 676 NFPA 85 or NFPA 86 4 3 8 2nd flame proving perio...

Page 48: ...rner and controller enable The controller enable signal delay time ensures a stable combustion process e g through uniform heating of the entire combustion chamber The time tRF starts to elapse after expiry of if tSA1 tFS1 0 tSA2 0 tFS1 tSA2 0 tSA2 tFS2 0 tFS2 tFS1 0 tSA2 0 tFS1 0 TheBCUshowsprogramstatus H8 AftertimetRF haselapsed theBCUclosestheoperationsignallingcontact terminals 17 18 andactiv...

Page 49: ...restart will take place after a flame failure during operation If the BCU detects an installation fault e g flame fail ure after the second flame proving period has elapsed the valves are closed and the operation signalling con tact is opened within time tSB The burner control unit now attempts to restart the burner once The restart begins with pre purge For further restart attempts the burner mus...

Page 50: ...f 1 s before the end of the second safety time tSA2 If tSA2 is set to 0 this occurs at the end of the first flame proving period tFS1 or at the end of the first safety time tSA1 if tFS1 0 This setting is required for pilot main burner systems where the pilot burner does not ignite the main burner safely in each operating status Parameter 27 1 valve V2 remains open during the en tire burner operati...

Page 51: ...e start up signal ϑ is applied The requirement for monitoring of the minimum gas pressure is stipulated in the relevant application stand ard 4 5 2 Digital input function Parameter 24 Defines the function of the input on terminal 11 Parameter 24 0 input has no function Parameter 24 1 monitoring of the maximum gas pressure DGmax To ensure that the permissible gas pressure on the burner is not excee...

Page 52: ... monitoring signal acti vated Once the fan has been activated the BCU checks whether the air monitor switches while the actuator moves to the Open position start up with pre purge or during the waiting time quick start The signal to input DL must be switched to HIGH If the HIGH sig nal is not applied the BCU performs the set number of further start up attempts parameter 07 after a delay time of 25...

Page 53: ... until the end of the main burner safety time tSA2 and during burner operation after the end of main burner flame proving period tFS2 until the end of normal operation the air must flow and a HIGH signal must be applied to input DL If the HIGH signal drops the BCU performs a safety shut down DL signal drops during burner start If further start up attempts have been parameterized parameter 07 a fur...

Page 54: ...ressure pu mbar psig the leakage rate QL l h ft3 h and the test volume VP l ft3 tP 4 x pu mbar x VP l QL l h 1 s Leakage rate The tightness test allows a check to be made for a spe cific leakage rate QL In countries where the standards and Directives of the European Union are applicable the maximum leakage rate QL is 0 1 of the maximum flow rate Q N max m3 ft3 h n Leakage rate QL l h Q N max m3 h ...

Page 55: ...3 h 425 6 ft3 h VG L1 4 VG L 5 23 21 24 17 18 19 20 25 BCU 370 I1 D3 22 26 28 VG VG L Vp pu 50 mbar Q N max 15 m3 h DN 20 0 5 m Leakage rate QL 15 m3 h 425 6 ft3 h x 0 1 15 l h 0 4256 ft3 h 2 x VG 20 distance L 0 5 m 19 68 inch Test volume VP 0 12 l 0 5 m x 0 3 l m 0 27 l 0 28 qt Calculated test period tP s 4 50 x 0 27 s 7 6 s 15 Set the next highest value 10 s using parameter 26 ...

Page 56: ...om the butterfly valve The outputs for valve control are not activated 4 6 2 Pre purge Parameter 06 This parameter determines whether the BCU pre purg es on the next start up after a controlled shut down Within the scope of the application standard EN 676 pre purge can be dispensed with under certain condi tions This prevents cold air from entering the combus tion chamber and accelerates burner st...

Page 57: ...ition for quick start after controlled shut down Once the start up signal ϑ has been ap plied the BCU initiates burner ignition immediately af ter the fan run up time parameter 20 and the waiting time Parameter 28 1 the BCU sets the butterfly valve to the Closed position for quick start after controlled shut down Once the start up signal ϑ has been applied the BCU moves the actuator to the Ignitio...

Page 58: ...witch DL contact has closed If Pre purge on each start up is deactivated param eter 06 0 pre purge is omitted on burner start after a controlled shut down within the last 24 hours If the pre purge time tPV is set to 0 s pre purge is al ways omitted e g even on restart after a safety shut down The BCU carries out a quick start on each burner start The butterfly valve is moved to the Ignition posi t...

Page 59: ...afety shut down If the actuator is located above the Ignition position at this time it moves to the Ignition position If it is below the Ignition position the actuator stays in its current position Pre purge on each start up parameter 06 1 The actuator moves to the Closed position after the end of the post purge time tPN Quick start parameter 06 0 or pre purge time 0 parameter 18 0 After the post ...

Page 60: ...x 9 32 DGmin 7 DL 90 0 0 90 tSA1 06 H0 05 00 tFS1 tE 01 tGV P1 A2 tPV tZ1 03 04 tVZ H8 07 tFS2 A1 08 tRF tSA2 This parameter defines the time between the activation of the fan output terminal 3 and the opening of the butterfly valve or burner start Fan start with the butterfly valve being closed reduces the start up current of the fan motor ...

Page 61: ...osition If both bits are set the valve stops The BCU 370 displays fault message 56 Open Close set simultaneously The lower limit of the modulation range is defined using parameter 32 4 7 2 Bus control limitation Parameter 32 Only on BCU 370 B1 3 Defines the lower limit of the modulation range of the butterfly valve Parameter 32 0 when bit 7 is activated the butterfly valve moves to the Closed posi...

Page 62: ...ator r 25 26 27 28 29 30 31 32 M 90 0 0 90 Min Definition of the modulation range following controller enable BCU B1 3 with three point step control function Valve position Output byte Upper end position Open Bit 6 Lower end position Closed Bit 7 parameter 32 0 Lower end position Low Bit 7 parameter 32 1 terminal 25 wired to separate limit switch Lower end position Ignition Bit 7 parameter 32 2 ...

Page 63: ...nd closed as re quired By holding the button the motor is first opened further The BCU indicates A 1 with blinking dots Once the button has been released the butterfly valve stops in the relevant position If the button is pressed again the butterfly valve is closed Closed position The BCU indicates A 0 with blinking dots A change of direc tion takes place each time the button is released and press...

Page 64: ...ternally Parameter 81 shows the most recent fault message parameter 82 the one before and so on 4 10 Password 4 10 1 User defined password Parameter 30 Password saved to protect parameter settings To prevent unauthorized changes to parameter settings a password is stored in parameter 30 The parameter settings can be modified after the password 4 num bers has been entered The password can be change...

Page 65: ...no specification Ignition Electronic ignition single pole Electronic ignition double pole Electronic ignition double pole with neutral conductor Without ignition F Fan control E Valve control U0 U1 Flame control Ionization control continuous or intermittent op or UV control intermittent op with UVS UV continuous operation with UVD 1 D1 D3 DGmax monitoring Integrated tightness control B1 For PROFIB...

Page 66: ...ft Install well away from mains cables and interference from electro magnetic sources Do not lay together with ignition cable 6 1 3 Ignition cable BCU 370 I1 BCU 370 I2 with integrated electronic ignition unit Use an unscreened high voltage cable see page 71 Accessories Cable length max 1 m 3 2 ft Avoid external electrical interference Permanently connect the ignition cable s to the inte grated ig...

Page 67: ... check takes place The related control output is switched off briefly The feedback sig nal must drop accordingly 6 4 Safety interlock limits The limiters in the safety interlock linking of all the rel evant safety control and switching equipment for the use of the application for example STL safety temper ature limiter must isolate terminal 24 from the voltage supply If the safety interlock is int...

Page 68: ... suitable for hard wiring only Do not reverse phase and neutral conductor Different phases of a three phase current system must not be installed at the inputs Do not connect voltage to the outputs On BCU 370 B1 for PROFIBUS DP no voltage may be connected to terminals 17 to 23 Otherwise the BCU may be damaged 6 7 1 Single electrode operation with external ignition unit N 13 14 15 16 PE BCU 370 If a...

Page 69: ...use cannot be replaced since safe opening of the contacts is not guaranteed following overload or a short circuit e g due to a wiring fault The BCU must be returned to the manufacturer for repair 6 11 Installation Recommended installation position vertical cable glands pointing downwards Detach the upper section of the BCU remove and screw on lower section with four screws Ø 4 mm Replace up per se...

Page 70: ... does not respond to sunlight incan descent bulb light or infrared radiation emitted by hot workpieces or red hot furnace walls In the event of incident UV radiation the UV sensor rec tifies the supplied alternating voltage As with ioniza tion control the burner control unit only detects this DC signal When using UV sensors of Type UVS the burner control unit may be used for intermittent operation...

Page 71: ...ot 4 mm interference sup pressed Order No 04115308 Straight terminal boot 4 mm interference suppressed Order No 04115307 Straight terminal boot 6 mm interference suppressed Order No 04115306 8 4 Connection kit BCU 370 2 M16 cables glands 2 plug connectors for ignition cable 2 seal inserts for M20 cable glands The connection kit is included in the scope of delivery for the lower section Order No 74...

Page 72: ...72 Accessories 8 6 GSD master data file for BCU 370 B1 The GSD file can be downloaded from our Internet site at www docuthek com Log on to the Docuthek and then choose document type Software GSD file on CD Order No 74960460 ...

Page 73: ... spark gap 3 mm secondary connection diameter 1 4 mm to grounding connection BCU 370W I2 Ignition voltage 22 kVpp ignition current 40 mA spark gap 3 mm secondary connection diameter 2 4 mm BCU 370Q I1 Ignition voltage 12 kV amplitude ignition current 40 mA spark gap 3 mm secondary connection diameter 1 4 mm to grounding connection BCU 370Q I3 Ignition voltage 2 6 5 kV amplitude ignition current 40...

Page 74: ... conductor Contact rating Valves max 1 A cos j 1 Butterfly valves max 1 A cos j 1 Ignition max 1 A cos j 0 3 Controller enable signal max 1 A cos j 1 the contacts may be loaded with a max total of 2 5 A Fan max 3 A start up current max 6 5 A 1 s The outputs may be loaded with a max total of 4 A Operation and fault signalling contacts Dry contact max 1 A 253 V not internally fused does not satisfy ...

Page 75: ...ment display B Off switch deactivates the BCU outputs are discon nected from the electrical power supply C Reset Information button to reset the system after a fault to scan parameters on the display or to con trol manual operation D Optical interface E BCU label with the most important status messages in English Additional stickers in D F I NL and E enclosed ...

Page 76: ...BCU 370 Edition 01 19 76 Technical data 9 3 Converting units See www adlatus org ...

Page 77: ...imits Start up signal Controlled air flow Ignition transformer Gas valve Flame signal Operating signal Fault signal Reset Input signal Output signal Flame simulation check p Pressure switch DL for air DG for gas Ignition Ignition position Three point step controller M Actuator in connection diagram ...

Page 78: ...system cannot be reset by mains failure In the event of a fault lock out of the BCU the fault signalling contact closes the display blinks and shows the current program step see page 37 Fault mes sage blinking The gas valves are disconnected from the electrical power supply The fault signalling contact opens if the mains voltage fails In order to restart the BCU can only be reset manually using th...

Page 79: ...ty time 7 04 1st safety time on start up 07 Flame failure during 2nd flame proving period 8 05 1st flame proving period 08 Flame failure during operation 9 06 2nd safety time on start up 10 07 2nd flame proving period d0 Fault Air monitor break contact check 11 08 Controller enable signal d1 Fault Air monitor make contact check 12 P9 Post purge time d2 Fault Air supply while butterfly valve moves ...

Page 80: ...u6 Fault DGmin during 2nd safety time 27 u7 Fault DGmin during 2nd flame proving period 28 u8 Fault DGmin during operation 29 u9 Fault DGmin during post purge time 30 o0 Fault DGmax in start up position standby 31 o1 Fault DGmax while butterfly valve moves to Open position 32 o2 Fault DGmax while butterfly valve moves to Closed position 33 o3 Fault DGmax during pre ignition time 34 o4 Fault DGmax ...

Page 81: ...10 Too many remote resets 58 bE Bus module error 61 31 CRC error Parameter 62 32 Undervoltage 63 33 EEProm parameter exceeds limit valvue 65 35 Fault Valve feedback 66 36 Tightness control V1 leaking 67 37 Tightness control V2 V3 leaking 80 50 Safety interlock failure 82 52 Permanent remote reset 83 53 Timing cycle too short 85 55 DGmin oscillating 86 56 Open Close set simultaneously 99 99 Interna...

Page 82: ...o get to know the product To choose a product Planning To look for information My scope of functions Technical department Sales No answer Remarks Elster GmbH Postfach 2809 49018 Osnabrück Strotheweg 1 49504 Lotte Büren Germany Tel 49 541 1214 0 Fax 49 541 1214 370 hts lotte honeywell com www kromschroeder com The current addresses of our international agents are available on the Internet https the...

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