Interlocks

The following table provides the phase name and the start interlock condition.

Phase Start Interlocks

Phase Name and Start Interlock Condition

Phase Name

Start Interlock Condition

  • Continuous Steam Conditioning

  • Conditioning Dwell via Pressure

  • Conditioning Dwell via RH/AH

  • Dynamic Conditioning with Nitrogen

Average chamber temperature is greater than or equal to the minimum chamber temperature alarm tolerance.

  • Dynamic Conditioning with Air

Average chamber temperature is greater than or equal to the minimum chamber temperature alarm tolerance.

Less than 27 mg/l of EO (calculated) present in the chamber.

  • EO Inject via Pressure

  • EO Inject via Concentration

  • EO Inject via Weight

Tank ID has been assigned to the scale.

EO drum net weight is greater than the General Configuration “EO drum empty net weight” [Parameter 89] value (Alarm 92 not active).

General Configuration EO weigh scale wait duration [Parameter 1005] must have elapsed (used for capturing the final EO weight from the phase).

  • EO Dwell (with make-up)

Tank ID has been assigned to the scale.

EO drum net weight is greater than the General Configuration “EO drum empty net weight” [Parameter 89] value (Alarm 92 not active).

Average chamber temperature is greater than or equal to the minimum chamber temperature alarm tolerance.

General Configuration EO weigh scale wait duration [Parameter 1005] must have elapsed (used for capturing the final EO weight from the phase).

  • EO Dwell (no make-up)

     

Average chamber temperature is greater than or equal to the minimum chamber temperature alarm tolerance

General Configuration EO weigh scale wait duration [Parameter 1005] must have elapsed (used for capturing the final EO weight from the phase).

  • EO Dwell with Nitrogen Make-up

Average chamber temperature is greater than or equal to the minimum chamber temperature alarm tolerance.

Air In-bleed

Less than 27 mg/l of EO (calculated, configurable) present in the chamber.

FINAL Air In-bleed

No more than 13.5 mg/l of EO (calculated, configurable) is present in the chamber.

Vacuum

(Calculated EO Concentration <= 13.5 mg/l) OR (if Calculated EO Concentration > 13.5 mg/l, then Emission Control, i.e. Remote Hold, must be ready)

Venting System Active (DI-395) is OFF (if exists/configured)

Super-Atmospheric EO Dwell

Average chamber temperature is greater than or equal to the minimum chamber temperature alarm tolerance

General Configuration EO weigh scale wait duration [Parameter 1005] must have elapsed (used for capturing the final EO weight from the phase).

Device Interlock Alarms

The following alarms will be raised to indicate that a device interlock condition has prevented a system command from being completed:

  1. Alarm 408: If any open interlock conditions for a given block valve are not true when the system commands the block valve to open, an alarm will be raised.

  2. Alarm 409: If any close interlock conditions for a given block valve are not true when the system commands the block valve to close, an alarm will be raised.

  3. Alarm 410: If any forward interlock conditions for a given motor are not true when the system commands the motor forward, an alarm will be raised.

  4. Alarm 411: If any reverse interlock conditions for a given motor are not true when the system commands the motor to reverse, an alarm will be raised.

  5. Alarm 412: If any ON interlock conditions for a given digital output are not true when the system commands the digital output ON, an alarm will be raised. This does not apply for Door Open Enable DO-22.

  6. Alarm 413: If any OFF interlock conditions for a given digital output are not true when the system commands the digital output OFF, an alarm will be raised. This does not apply for Door Open Enable DO-22.

Refer to the Device Interlock SFS (2013-PR-020A-SFS-INT) for more information regarding device interlocks.