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Honeywell Krom Schroder PFU 780, Technical Information, Page: 64 / 71

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Honeywell Krom Schroder PFU 780 Technical Information Download Page 64

PFU 780 · Edition 02.12l

64

Technical data

9 .1 Safety-specific characteristic values

In the case of ionization control, suitable 

for Safety Integrity Level

SIL 3 

Diagnostic coverage DC

97.9%

Type of subsystem

Type B to EN 61508-2, 7.4.3.1.4

Mode of operation

High demand mode pursuant to 

EN 61508-4, 3.5.12

Mean probability of dangerous failure 

PFH

D

1.34 x 10

-8

 l/h

Mean time to dangerous failure MTTF

d

MTTF

d

 = 1 / PFH

D

Safe failure fraction SFF

99.2%

The specified values apply for the combination with 

ionization electrode (sensor) and PFU 780 (logic).

Relationship between the Performance Level (PL) 
and the Safety Integrity Level (SIL)

PL

SIL

a

–

b

1

c

1

d

2

e

3

Pursuant to EN ISO 13849-1:2006, Table 4, the PFU 

can be used up to PL e.

Max. service life under operating conditions:

20 years after date of production, plus max. 1/2 year in 

storage prior to first use.
For a glossary of terms, see page 68 (Glossary).

Summary of Contents for Krom Schroder PFU 780

Page 1: ... of unlimited capacity in thermoprocessing equipment pursuant to EN 746 2 Separate flame control for pilot burner and main burner by UV ionisation or a further option of using the furnace chamber temperature Display of the program status unit parameters and flame signal Manual mode for burner adjustment and for diagnostic purposes ...

Page 2: ...dby 29 4 4 2 Minimum burner pause time tBP 30 4 5 Behaviour during start up 31 4 5 1 Safety time on start up tSA 31 4 5 2 Flame proving period tFS 32 4 5 3 Minimum combustion time tB 32 4 5 4 Burner start up attempts 33 4 6 Behaviour during operation 35 4 6 1 Safety time during operation tSB for pilot and main burners 35 4 6 2 Fault lock out or restart pilot burner 35 4 6 3 Fault lock out or resta...

Page 3: ...age cable 56 8 2 BCSoft 56 8 3 Stickers for labelling 56 8 4 Changed parameters stickers 56 8 5 Radio interference suppressed electrode adapters 57 8 6 Socket connectors 57 8 7 Module subrack 57 8 8 Power supply PFP 700 58 8 9 Relay module PFR 704 59 8 10 Field bus interface PFA 700 60 8 11 Impulse system MPT 700 61 9 Technical data 62 9 1 Safety specific characteristic values 64 9 2 Operating con...

Page 4: ...reduces the main burner start up time The pilot burner can burn permanently or be switched off The main burners may be modulating or stage controlled On industrial furnaces the PFU 780 reduces the load on the central furnace control by taking over tasks that only relate to the burner for example it ensures that the burner always ignites in a safe condition after it has been restarted The burner co...

Page 5: ...it parameters of the application by using the optical interface To support service personnel BCSoft offers a conveni ent visualisation system of the input and output signals and the error history Bogie hearth forging furnace in the metallurgical industry Intermittent shuttle kiln in the ceramics industry Walking beam furnace with overhead firing ...

Page 6: ...ting pilot burner Control Main burner ON OFF The main burner can be started with reduced capacity after the operat ing signal from the pilot burner has been detected The pilot burner is switched off automatically after the main burner has started up When the main burner is switched off the pilot burner automatically switches on again A UV sensor monitors the flame sig nal from pilot and main burne...

Page 7: ... 04 06 08 06 08 04 2 1 ϑ1 ϑ2 µC ϑ1 ϑ2 26a Application 1 1 2 Stage controlled main burner with permanent pilot burner Control Main burner ON OFF The main burner can be started with reduced capacity after the operat ing signal from the pilot burner has been detected Pilot and main burn ers can be operated simultaneously Both are ionisation controlled inde pendently ...

Page 8: ...Main burner continuous The butterfly valve for air BV is moved to ignition position in order to start the main burner The main burner can be started at low fire rate after the operating signal from the pilot burner has been detected The control system controls the burner capacity via the butterfly valve for air BV after the operating state has been signalled Pilot and main burners can be operated ...

Page 9: ...ipment The flame is controlled indirectly on the basis of the temperature During the start up process as long as the wall temperature is below auto igni tion temperature the flame must be controlled by conventional meth ods When the working temperature has exceeded 750 C the safety temperature monitor STW takes over the indirect flame control ...

Page 10: ...sted and certified pursuant to Gas Appliances Directive 2009 142 EC in conjunc tion with EN 298 2004 01 Meets the requirements of the Low Voltage Directive 2006 95 EC EMC Directive 2004 108 EC PFU T is FM approved Factory Mutual Research Class 1997 Suitable for applications pursuant to NFPA 86 www approvalguide com AGA approved AGA Australian Gas Association Approval No 5597 www aga asn au product...

Page 11: ...2 10c 12c 10a 12a 30e 22a P DI A 2 1 1 N 2 28c 26a ϑ1 ϑ2 14a 14e 10e 12e 24c 20c 18a l 20c 18a N 26a 26a N 28c 28c 18a Z I UVS 1 2 3 24c L N M V2 V1 C µC SK A S PFU 780 Function 3 Function 3 1 Connection diagram For cable selection and wiring see page 50 Project planning information 3 1 1 PFU 780 For the explanation of symbols see page 67 Legend ...

Page 12: ...1 6a 6e n c1 24 V 0 V c2 10c 12c 10a 12a 30e 22a P DI A 2 1 1 N 2 28c 26a ϑ1 ϑ2 14a 14e 10e 12e 24c 20c 18a l 20c 18a N 26a 26a N 28c 28c 18a Z I UVS 1 2 3 24c L N M V2 V1 C µC SK A S PFU 780 K2 Function 3 1 2 PFU 780 K2 As a replacement unit for burner control unit PFU 798 For the explanation of symbols see page 67 Legend ...

Page 13: ...ed If the pilot burner has been started successfully and its flame has stabilised the burner control unit issues the Enable signal for main burner operation The operation sig nalling contact for the pilot burner terminals 2c 4c closes 01 02 00 Switch on PFU 780 Pilot burner start up with ϑ1 signal Safety interlocks Limits In the event of fault signal Reset If parameter P15 1 flame simulation check...

Page 14: ...2 has been applied terminals 14a and 14e the PFU 780 opens valve V2 The main burner is ignited by the pilot burner If a flame is detected during the safety time tSA2 the flame proving period tFS2 starts after the safety time tSA2 has elapsed If the main burner has been started success fully and its flame has stabilised the operation signalling contact terminals 6a 6e closes Start up of the pilot b...

Page 15: ...ration If the flame fails during operation either an immediate fault lock out occurs or a restart occurs This pro cedure can be set via the optical in terface parameter 13 Main burner restart 08 00 08 07 or fault lock out Normal shut down via ϑ signal for pilot and main burners If min combustion time tB has elapsed Operation signalling contact opens V1 and V2 close min burner pause time tBP starts...

Page 16: ...p without flame signal main burner Flame proving period main burner 7 Flame failure during flame proving period main burner Operation main burner 8 Flame failure during operation main burner Purge P0 Air valve A High temperature operation 10 Faulty remote reset 32 Supply voltage too low 33 Faulty parameterisation 35 Short circuit on a valve output 36 Short circuit on ignition or valve output 51 Sa...

Page 17: ... 12l 17 Function Program status DISPLAY Fault message blinking 52 Permanent reset 53 Time between two start ups is too short In Manual mode two dots will blink on the display in program status 01 08 Optionally available ...

Page 18: ...tart main burner 13 0 1 0 Safety time during operation for V1 and V2 tSB 14 1 2 s 1 s Flame simulation check in start up position standby 15 0 1 1 Permanent pilot burner 16 0 1 1 Minimum combustion time tB 20 25 s tSA Minimum burner pause time tBP 21 0 250 s 0 s Pilot burner safety time on start up tSA1 22 3 5 10 s Pilot burner flame proving period tFS1 23 0 25 s 0 s Main burner safety time on sta...

Page 19: ...nction inactive 1 Function active On parameterisation ensure that the program se quence started matches the application Select the parameters so that the burner can restart as intended in all operating phases 4 1 Scanning the parameters During operation the 7 segment display shows the pro gram status The flame signal and all following parameters of the PFU can be scanned one after the other by rep...

Page 20: ...hich program posi tion the unit was in when the fault was detected wait ing time 01 or standby 00 Result A flame simulation was detected during the waiting time or standby 4 2 4 Switch off threshold of the flame amplifier Parameter 04 pilot burner switch off threshold Parameter 05 main burner switch off threshold The sensitivity at which the burner control unit still de tects a flame can be set be...

Page 21: ...lame signal The safety function of the device internal flame control sys tem is placed out of operation In High temperature mode the gas valves are opened without flame control The precondition for high temperature operation is that an external flame safeguard ensures the presence of the flame in fail safe manner indirectly via the tempera ture For this purpose we recommend a safety tem perature m...

Page 22: ...ns for the duration of the flame fail ure FA When High temperature mode is ended the PFU switches off the burner and restarts with flame simu lation check recommended in the case of UV control with UVS Parameter 33 2 06 07 08 08 t tSA2 tFS2 26a 16c 18e 2c 4c 18a 14a 88 10e 26e 30a 28c 2e 4e 6a 6e 22a V1 1 V2 2 ϑ1 ϑ2 2 1 DI tSA1 tZ 04 02 03 01 tFS1 tW 2a 4a When High temperature mode is ended the P...

Page 23: ...s of parameter 33 Fault pilot burner t 04 04 26a 16c 18e 2c 4c 18a 14a 88 10e 26e 30a 28c 2e 4e 6a 6e 22a V1 1 V2 2 ϑ1 ϑ2 2 1 DI Fault main burner 08 t 08 26a 16c 18e 2c 4c 18a 14a 88 10e 26e 30a 28c 2e 4e 6a 6e 22a V1 1 V2 2 ϑ1 ϑ2 2 1 DI Parameter 33 4 08 08 t 26a 16c 18e 2c 4c 18a 14a 88 10e 26e 30a 28c 2e 4e 6a 6e 22a V1 1 V2 2 ϑ1 ϑ2 2 1 DI 2a 4a If the flame fails during high temperature opera...

Page 24: ...The time starts each time the start up signal ϑ is applied Parameter 35 0 Unlimited burner operation Parameter 35 1 An automatic restart is activated once every 24 hours It must be ensured in this case that the program se quence started matches the application This param eter may be set in this way only if the burner can restart as intended in all operating phases ...

Page 25: ...safety time By using two flame amplifiers the pilot and main burners can be monitored separately The PFU 780 can also be used on indirectly ignited sur face burners with end point monitoring Three different operating modes are possible Permanent pilot burner t 1 2 ϑ1 ϑ2 88 02 04 06 08 04 06 08 04 For applications which require a high system availabil ity or where a continuously burning flame is ne...

Page 26: ...ner safety time tSA2 This type of flame control is required if no distinction can be made between the flame signals of the pilot and main burners e g if both burners can be monitored with a single UV sensor If the start up signal for the pilot burner is applied continually the pilot burner restarts immediately after the main burner has been switched off ...

Page 27: ...ly in the case of pilot and main burner monitoring Operating mode Intermittent pilot burner Start up as in the illustration Permanent pilot burner with the difference being that the start up signal for pi lot and main burners is applied synchronously and that immediately after the flame proving period tFS1 the main burner is started tSA1 tZ 04 06 07 08 02 03 00 t tFS1 tSA2 tFS2 26a 16c 18e 2c 4c 1...

Page 28: ...once the safety time tSA2 has elapsed In this setting the flame signal can be connected to terminals 18a or 26a The pilot burner is switched off after the main burner safety time tSA2 has elapsed tSA1 tZ 04 06 07 08 02 03 00 t tFS1 tSA2 tFS2 26a 16c 18e 2c 4c 18a 14a 88 10e 26e 30a 28c 2e 4e 6a 6e V1 1 V2 2 ϑ1 ϑ2 2 1 PFU 780 A P L1 1 2 SPS PLC CPE ϑ VR R VAG TZI 2 1 UV VAS ...

Page 29: ... is detected by the main burner Parameter 15 0 The flame simulation check is con ducted after applying the start up signal ϑ during the waiting time tW Parameter 15 1 The flame simulation check is con ducted provided no start up signal ϑ is applied during the so called start up position standby This allows fast start up of the burner since there is no waiting time tW The burner must have been swit...

Page 30: ...up is delayed until the end of the pause time After the pause time the burner is started if the start up signal ϑ is applied The minimum burner pause time tBP serves to adapt the program sequence to the requirements of the applica tion The time should be set such that the system can be moved to ignition position i e butterfly valves can be closed and possibly gas can be flared off before a re star...

Page 31: ...tSA1 tZ 04 02 03 00 t tFS 26a 16c 18e 2c 4c 88 10e 26e 30a 28c 2e 4e V1 1 V2 ϑ1 1 Safety time on start up tSA1 for the pilot burner Main burner Parameter 24 tSA1 tZ 04 06 07 08 02 03 00 t tFS1 tSA2 tFS2 26a 16c 18e 2c 4c 18a 14a 88 10e 26e 30a 28c 2e 4e 6a 6e V1 1 V2 2 ϑ1 ϑ2 2 1 Safety time on start up tSA2 for the main burner ...

Page 32: ...mable time between 0 and 25 s This time elapses before the PFU starts the next pro gram step so as to give the flame time to stabilise 4 5 3 Minimum combustion time tB Parameter 20 04 06 07 t tB 26a 16c 18e 2c 4c 18a 14a 88 10e 26e 30a 2e 4e 6a 6e V1 1 V2 2 ϑ1 ϑ2 2 1 Programmable time to maximum 25 s during which the main burner remains in operation In the case of brief activation of the start up ...

Page 33: ...rt up For units approved by FM Approval see type label it is only possible to select one start up attempt 1 start up attempt Parameter 10 1 tSA tZ 02 00 t 02 26a 16c 18e 2c 4c 88 10e 26e 30a 28c 2e 4e V1 V2 ϑ1 If no flame forms during start up a fault lock out is performed after expiry of time tSA The display blinks and shows the cause of the fault 2 or 3 start up attempts Parameter 10 2 3 tSA1 tZ...

Page 34: ...ct one start up attempt 1 start up attempt Parameter 11 1 tSA1 tZ 04 06 02 03 00 t tFS1 tSA2 06 26a 16c 18e 2c 4c 18a 14a 88 10e 26e 30a 28c 2e 4e 6a 6e V1 1 V2 2 ϑ1 ϑ2 2 1 If no flame forms during the start up of the main burner a fault lock out is performed after expiry of time tSA2 The display blinks and shows the cause of the fault 2 or 3 start up attempts Parameter 11 2 3 tSA2 tSA2 tSA2 tSA1 ...

Page 35: ... Fault lock out or restart pilot burner Parameter 12 This parameter determines whether the PFU starts a one off restart or performs an immediate fault lock out for the burner after an installation fault such as a flame failure or failure of air flow see also Project planning information Immediate fault lock out following flame failure Parameter 12 0 Pilot burner fault lock out 04 t tSB 04 26a 16c ...

Page 36: ... now attempts to restart the burner once If the burner does not function a fault lock out occurs The display blinks and shows the cause of the fault In accordance with EN 746 2 a restart may be con ducted only if the safety of the installation is not im paired Restart is recommended for burners which oc casionally display unstable behaviour during operation The precondition for a restart is that a...

Page 37: ... performs a fault lock out within the safety time during operation tSB This involves disconnecting the power from the gas valves and the ignition transformer The fault signalling contact closes the display blinks and shows the current program status see table Program status and fault messages After a fault lock out the burner control unit can be reset either with the button on the front panel or u...

Page 38: ...ntrol unit now attempts to restart the main burner once If the burner does not function a fault lock out occurs The display blinks and shows the cause of the fault In accordance with EN 746 2 a restart may be con ducted only if the safety of the installation is not im paired Restart is recommended for burners which oc casionally display unstable behaviour during operation The precondition for a re...

Page 39: ...n time tKN after a normal shut down 4 7 1 Purge Parameter 42 0 The air valve is closed when voltage is applied to terminal 30e Parameter 42 1 The air valve is opened when voltage is applied to terminal 30e In the case of multiple burner applications burners with mechanical combustion air supply are used The air for combustion and pre purge is supplied by a central fan controlled by a separate logi...

Page 40: ...nput 30e Parameter 31 0 The air valve remains closed during start up even if it is activated externally These settings are required on burners on which the gas air ratio is controlled via a pneumatic link and which also need to be started at low fire e g on two stage controlled burners In this case activation of the air valve during burner start via input 10a must be pre vented External control al...

Page 41: ...8c 2e 4e 6a 6e V1 1 V2 2 ϑ1 ϑ2 2 1 VAG PFU 780 L A P L1 1 2 ϑ VAS TZI 2 1 UV VAS 1 Parameter 30 0 The air valve opens if it is activated externally via input 10a Parameter 31 1 The air valve can be activated even during start up These settings may be selected only if the burner can start with full air capacity The air valve can be activated externally via input 10a for cooling the burner in the st...

Page 42: ... 10e 26e 30a 28c 2e 4e 6a 6e V1 1 V2 2 ϑ1 ϑ2 2 1 PFU 780 L A P L1 1 2 ϑ VR R VAG VBY TZI 2 1 SPS PLC CPE Parameter 30 2 The air valve opens simultaneously with valve V2 Application Single stage controlled main burner is switched ON OFF via the ϑ input The air valve can be activated externally via input 10a for cooling the burner in the start up position standby ...

Page 43: ...c 2e 4e 6a 6e V1 1 V2 2 ϑ1 ϑ2 2 1 PFU 780 L A P L1 1 2 ϑ VR R VAG VBY TZI 2 1 SPS PLC CPE Parameter 30 3 The air valve opens simultaneously with the operating signal Application Two stage controlled main burner is switched ON OFF via the ϑ input The air valve can be activated externally via input 10a for cooling the burner in the start up position standby ...

Page 44: ...wly The air flowing in during the closing time increases the O2 content in the combustion chamber Parameter 36 3 5 10 15 25 or 60 low fire over run time tKN 3 5 10 15 25 or 60 s The air valve closes slowly after the activation signal has been switched off The gas valve remains open for tKN This means that the burner after deactivation of the main burner start up signal ϑ2 is initially adjusted dow...

Page 45: ...This determines whether the air valve can be activated in the case of a fault lock out Parameter 32 0 The air valve is closed in the event of a fault It cannot be activated externally via terminal 10a Parameter 32 1 The air valve can be activated externally via input 10a even during a fault e g for cooling ...

Page 46: ...es to the next section of the program sequence and stops there After approx 3 s the flame signal will be displayed instead of the program parameter Briefly pressing the Reset Information button 1 s displays the relevant Manual mode step If there is flame simula tion during the start up the flame signal is displayed immediately On units with air valve control the air valve can be opened and closed ...

Page 47: ... changes to param eter settings a password is stored in parameter 50 Changes to parameter settings can only be made once this number has been entered The password can be changed using BCSoft Note the effect of parameter settings on the safe func tioning of your system The password set at the factory can be found in the de livery note supplied ...

Page 48: ...PFU 780 Edition 02 12l 48 Selection 5 Selection 5 1 Calculating the safety time tSA ...

Page 49: ...dard available Order example PFU 780LT 5 2 1 Type code Code Description L Air valve control T N Mains voltage 220 240 V 15 10 50 60 Hz 110 120 V 15 10 50 60 Hz D Digital input to interrupt flame control U Preparation for UV sensor for continuous operation UVD 1 K2 Compatible with PFU 798 If none this specification is omitted ...

Page 50: ... 56 Accessories Do not lay UV ionisation cable and ignition cables together and lay them as far apart as possible 6 1 2 Ionisation cable Use unscreened high voltage cable see page 56 Accessories Cable length max 100 m Avoid ex ternal electrical interference Install as far as possible from mains and ignition cables and interference from electro magnetic sources If possible do not lay in a metal con...

Page 51: ... the valves until the minimum combustion time has elapsed 04 06 07 t tB 26a 16c 18e 2c 4c 18a 14a 88 10e 26e 30a 2e 4e 6a 6e V1 1 V2 2 ϑ1 ϑ2 2 1 In the case of pilot main burner monitoring the mini mum combustion time only has an effect on the be haviour of the main burner The minimum combustion time for the pilot burner is limited to the safety time on start up tSA1 Background The pilot burner is...

Page 52: ...s acknowledged by remote reset too often er ror 10 Too many remote resets is displayed The error can only be acknowledged with the Reset Information button on the unit The burner malfunction must be remedied The mal function can not be remedied by changing the method of activation 6 6 4 Burner start A furnace start may only be initiated if it has been en sured using an appropriate procedure that t...

Page 53: ... or higher whereby no condensation is permitted Cable length between PFU and burner max 100 m 6 10 Wiring The PFU is 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 PFU No voltage may be connected to the valve and ignition outputs 6 10 1 UVS sensor wiring Connect the UVS sensor directly to the PF...

Page 54: ...with EN 50156 it does allow the burner to be isolated functionally from the central control sys tem This function is required for manual operation and in the case of PROFIBUS units to switch off the unit without causing BUS errors Disconnection for electri cal maintenance work is to be implemented with an ex ternal switch per unit or group only in accordance with Standard EN 50156 6 15 Changing pa...

Page 55: ...ration must be interrupted at least once every 24 hours This can be programmed using para meter 35 For further information see brochure UVS The burner control unit PFU U is prepared for UV sensor UVD 1 This enables continuous operation For further information see Technical Information Bulletin UVD 7 3 Via the temperature in high temperature equipment High temperature equipment is defined as a ther...

Page 56: ... or 28 17 5 mm Colour silver 8 4 Changed parameters stickers D 49018 Osnabrück Germany Achtung geänderte Parameter Die Angaben auf dem Typenschild gelten nicht mehr in vollem Umfang Aktuelle Parameter direkt auslesen Important changed parameters The details on the type label are no longer completely accurate Read the current parameters direct from the unit Attention paramètres modifiés Les informa...

Page 57: ...ng module subrack printed circuit board with rear ter minal strip function tested standard documentation guide rails without partial front plates screw terminals at the rear single zone operation for MPT 700 opera ting modes 1 4 two zone operation for MPT 700 ope rating modes 1 4 but max 4 burners per zone Slot 1 for MPT 700 slots 2 9 for PFU 760 780 slot 10 for PFP 700 Order No 84402282 no illust...

Page 58: ...ntrol unit PFU or for supplying the auxiliary voltage to relay module PFR 704 Operating status display on the front plate PFP switches off in the event of an output over load Output voltage 24 V output rating 14 VA Order No 84366510 8ace 30a 32c F1 12ace N L1 PFP 700 U I 24 V 600 mA 0 V O I S0 230 V 115 V S1 ...

Page 59: ... V 230 V 24 V 115 V 230 V 24 V 115 V 230 V 24 V Accessories 8 9 Relay module PFR 704 For contact multiplication e g if several air valves are activated via a single control signal for pre purge or for heating cooling switchover when using an MPT Switching status display on the front plate Input voltage 110 120 V AC 15 10 50 60 Hz 220 240 V AC 15 10 50 60 Hz 24 V AC DC 10 Current per relay 25 mA Co...

Page 60: ... PFU 19c 17b 30e 26e PFU 24 V L1 PROFIBUS DP Accessories 8 10 Field bus interface PFA 700 For connection of up to nine automatic burner control units PFU 760 to industrial communication networks using PROFIBUS DP in order to transfer measuring control and regulation signals as a bundle 4 digital inputs 24 V DC 10 10 mA 4 digital outputs relay contact max 1 A 264 V not fused internally Mains voltag...

Page 61: ...re is circulated thanks to intermittent operation and thereby constant tem perature distribution and shorter heating up periods for all gas fired heat treatment furnaces are ensured Mains voltage 95 240 V AC 10 50 60 Hz Power consumption 10 VA Additional auxiliary voltage 12 24 V DC 10 max 1 1 A Controller inputs 2 x 0 4 20 mA with common earth floating load impedance approx 225 Ω Three point step...

Page 62: ...l 0 0 20 V 0 40 V Frequenz 50 60 Hz 50 60 Hz Rated value 24 V DC Signal 1 24 V 10 Signal 0 1 V Inherent current Signal 1 typ 5 mA Output voltage for voltage related outputs mains voltage Contact rating Gas valve V1 V2 Max 1 A resistive Max 1 A cos φ 0 3 Air valve Max 1 A resistive Max 1 A cos φ 0 3 Ignition Max 1 A resistive Max 1 A cos φ 0 3 Number of operating cycles Max 1 000 000 typically 400 ...

Page 63: ... A slow acting H pursuant to IEC 127 2 5 Ambient temperature 20 to 60 C 4 to 60 00 C Climate no condensation permitted Enclosure IP 00 pursuant to IEC 529 after installing in a 19 module subrack according to the instructions e g type BGT the front corresponds to IP 20 Input Output safety circuit All the inputs and outputs marked see connection diagrams may be used for safety tasks Weight approx 65...

Page 64: ...D 1 34 x 10 8 l h Mean time to dangerous failure MTTFd MTTFd 1 PFHD Safe failure fraction SFF 99 2 The specified values apply for the combination with ionization electrode sensor and PFU 780 logic Relationship between the Performance Level PL and the Safety Integrity Level SIL PL SIL a b 1 c 1 d 2 e 3 Pursuant to EN ISO 13849 1 2006 Table 4 the PFU can be used up to PL e Max service life under ope...

Page 65: ...E 3 HE 133 4 5 3 8 TE 40 6 1 6 Technical data 9 2 Operating controls A 2 digit 7 segment display B Reset Information button to reset the system after a fault or to scan parameters on the display C Mains switch D Optical interface E Type label ...

Page 66: ...PFU 780 Edition 02 12l 66 Maintenance cycles 10 Maintenance cycles Burner control unit PFU requires little servicing ...

Page 67: ...gnal pilot burner 2 Operating signal main burner Fault signal Reset Input signal Output signal Flame simulation check tW Waiting time 2 s tSA Safety time on start up 3 s 5 s or 10 s tSB Safety time during operation 1 s or 2 s tZ Ignition time 2 s 3 s or 6 s tLV Flame simulation delay time 25 s tFS Flame proving period 0 25 s tB Minimum combustion time tSA up to max 25 s tBP Minimum burner pause ti...

Page 68: ...t 12 3 Ignition time tZ If no malfunction is detected during the waiting time tW the ignition time tZ then starts to elapse Voltage is supplied to the pilot gas valve V1 and the ignition trans former and the burner is ignited The duration of the ignition time is either 2 3 or 7 seconds depending on safety time tSA selected 12 4 Flame simulation Flame simulation delay time tLV t 30e 10e 28c 16c 26a...

Page 69: ...s signalled Resetting must take place manually following a fault lock out 12 8 Safety interlocks Limits The limiters in the safety interlock linking of all the rel evant safety control and switching equipment for the use of the application e g safety temperature limiter minimum maximum gas pressure must isolate input from the voltage supply 12 9 Pilot gas valve V1 Thestartfuelflowrateforthepilotbu...

Page 70: ...ple diagnos tic coverage could exist for sensors and or logic system and or final elements Unit from EN ISO 13849 1 2008 12 14 Mode of operation High demand mode or continuous mode Operating mode where the frequency of demands for operation made on a safety related system is greater than one per year or greater than twice the proof test frequency from EN 61508 4 2001 12 15 Safe failure fraction SF...

Page 71: ...Use To 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 info kromschroeder com www kromschroeder com Contact The current addresses of our international agents are available on the Intern...

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