ABB NBRA-656C Chopper

Signalling within the electronic cabinet A system alarm pending in the central unit initiates the following reactions of the I/O bus interface module alarm logic: – The green LED (PROZ) on the ML1 alarm logic is OFF. – The red LED (STÖR) on the ML1 alarm logic blinks. – The output relay on the ML1 alarm logic is released, i.e. the cabinet lamp is activated. This signalling sequence is only reset after the last system fault has been cleared. The same indications of the alarm logic and the cabinet lamp can also be triggered via the binary value GB.ORPA.20. This allows status interpretation of any binary signal to be used for setting the cabinet lamp. The system resets the binary value GB.ORPA.20 every minute.

The cabinet lamp is ON if cyclic system alarms exist. 

If this state is caused by an S 305 common alarm (time–out from I/O module), the system may not be filed in online mode. The following must then be performed: – Remove the faulty I/O module and – Remove the associated driver from the processing cycle (remove or switch off preceding XB). or – Use the instruction ”STO;” in off line mode for filing. A defective I/O module must be replaced.

Signalling within the control room area 

Monitor output Standard system alarms are automatically displayed in the first monitor line (message line, Fig. 7.7). If system faults of the same type (e.g. ready time–out S 305) occur at the same time, each block generates and prints the associated I&C alarm once. The first alarm is displayed on the screen and can be acknowledged.

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