Tab 10-74 Outputs to SCR system failure
Indication on LDU
Possible cause
Procedure
SCR common alarm failure
Any of the minor or major failure is
active.
•
Do a check of the local LDU on
E71 or LDU ECR on E72 for
alarm details.
SCR shutdown request sent to
SCR system
If it is a major failure, a shutdown re-
quest from the SCR control is sent
to the SCR system.
•
Do a check of the local LDU on
E71 or LDU ECR on E72 for
alarm details.
Power failure
Power failure on the MCM-11
•
Re-establish the power supply
cables for power input 1 and 2.
For power input 1:
•
Re-establish the cabling
X24-1/2.
For power input 2:
•
Re-establish the cabling
X34-1/2.
10.20.3
Sequence failure
A sequence failure occurs, when a specified condition is not obeyed. The current active state is
not allowed and the state-machine activates the sequence fail state.
Another cause of a sequence failure can be that the timers for dosing start-up or maximum allowed
preparation time expire.
A sequence failure ignores a minor failure and Tier 2 SCR will disengage.
NOTE:
In this case SCR shut-down is not requested.
X72-B
AA00-0000-00AAD-410A-A
Operation Manual
LP SCR - Alarm failure troubleshooting
Winterthur Gas & Diesel Ltd.
- 466 -
Issue 003 2021-12
