Honeywell Krom Schroeder BCU 480 - Probability of Dangerous Failure PFHD; Mean Time to Dangerous Failure MTTF D

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BCU 480 · Edition 03.16l 82

Glossary

11.16 Probability of dangerous failure PFH

Value describing the likelihood of dangerous failure per

hour of a component for high demand mode or con-

tinuous mode. Unit: 1/h.

from EN 13611/A2:2011

11.17 Mean time to dangerous failure

MTTF

Expectation of the mean time to dangerous failure

from EN ISO 138491:2008

Main Page

Burner Control Units BCU 4801
Contents2
- Table of Contents2
1 Application5
- Examples of Application7
2 Certification12
3 Function13
- Connection Diagrams13
- Bcu19
- Profibus Dp20
- BCU 480 Program Sequence24
- Program Status and Fault Messages27
4 Parameters29
Scanning the Parameters30
Flame Control31
- Flame Signal, Pilot Burner31
- Flame Signal, Main Burner31
- Program Status When the most Recent Fault31
- Occurred31
- Switch-Off Threshold of the Flame Amplifier31
- High Temperature Operation in the Case of BCU32
- D2 or BCU32
- UVS Check35
Pilot and Main Burner Monitoring36
- Permanent Pilot Burner37
- Interrupted Pilot Burner37
Behaviour in Start-Up Position/Standby38
- Flame Simulation Check in Start-Up Position38
- Standby38
- Minimum Burner Pause Time T BP39
Behaviour During Start-Up40
- Safety Time on Start-Up T SA40
- Flame Proving Period T41
- Minimum Burner on Time T41
- Burner Start-Up Attempts42
Behaviour During Operation44
- Safety Time During Operation T44
- Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 SB for Pilot and Main44
- Fault Lock-Out or Restart, Pilot Burner44
- Fault Lock-Out or Restart, Main Burner46
- Program Status on Last Fault47
Air Valve Control on BCU48
- Purge48
- Cooling in Start-Up Position/Standby48
- Burner Start48
- (Not During Start-Up)49
- (Even During Start-Up)50
- Air Valve Opens with Valve V251
- Manual Mode55
  - Manual Mode Limited to 5 Minutes55
5 Selection56
- Type Code56
6 Project Planning Information57
- Cable Selection57
  - Ionization Cable57
  - Ignition Cable57
  - UV Cable57
- Ignition Electrode57
  - Electrode Gap57
  - Star Electrodes57
- Calculating the Safety Time T SA58
- Minimum Burner on Time59
- Safety Interlocks (Limits)59
- Protection of Safety-Relevant Outputs59
- Emergency off60
  - In the Event of Fire or Electric Shock60
  - Via the Safety Interlocks (Limits)60
- Reset60
  - Parallel Reset60
  - Permanent Remote Reset60
  - Automatic Remote Reset (PLC)60
- Burner Start60
- Restart and Start-Up Attempts60
- Fault Signalling61
- Protecting the Pilot Burner from Overload61
- Installation61
- Wiring62
- BCU and BCU62
- Power Management)62
- Signal Distributor Board62
- Profibus Dp63
  - Safety-Related Control Signals63
  - Wiring the PROFIBUS Plug Connector63
  - Emc63
  - Unit Replacement63
  - Status and Fault Messages for PROFIBUS DP64
- Third Gas Valve (Can be Shut Down) on BCU66
- BCU Switched off67
- Furnace Control67
- Mains Switch67
- Note on EC Type-Examination67
- SIL/PL Level for Thermoprocessing Equipment67
- Changing Parameters68
7 Flame Control69
- With Ionization Sensor69
- With UV Sensor69
- Via the Temperature in High Temperature70
- Equipment70
8 Accessories71
- High-Voltage Cable71
- Industrial Plug Connector, 16-Pin71
- PROFIBUS Plug Connector71
- Bcsoft72
- External Securing Bar73
- Fastening Set73
- Radio Interference Suppressed Electrode Plugs73
9 Technical Data74
- Bcu75
- Profibus Dp75
- Safety-Specific Characteristic Values76
- Housing Dimensions77
- Operating Controls77
- Installation77
10 Legend78
11 Glossary79
- Waiting Time T W79
- Safety Time on Start-Up T SA79
- Ignition Time T Z79
- Flame Simulation/Flame Simulation Delay Time T LV79
- Safety Time During Operation T SB80
- Flame Signal80
- Fault Lock-Out80
- Safety Interlocks (Limits)80
- Pilot Gas Valve V180
- Main Gas Valve V281
- Continuous Operation81
- Air Valve81
- Diagnostic Coverage DC81
- Mode of Operation81
- Safe Failure Fraction SFF81
- Probability of Dangerous Failure PFHD82
- Mean Time to Dangerous Failure MTTF D82
Feedback83
Contact83

Honeywell Krom Schroeder BCU 480 - Probability of Dangerous Failure PFHD; Mean Time to Dangerous Failure MTTF D

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