Alarm Changeover

An alarm changeover from the lead pump to the lag pump will occur if:

An on alarm can occur only if the input"PumpEnable" is off.

When an alarm changeover occurs the lead pump will be switched to be the lag pump and lag pump be the lead pump.

After the alarm has been solved, a new changeover will occur only if the automatic changeover conditions become true again.


Even if the customer sets ALM-03 = 1 fail to command alarm, we will track internally the on/ off alarms and do the changeover only in case of an off alarm.


If the manual switch condition input "ManSwCond" is configured as a preference switch (SYS-08 = 1), than the changeover will happen immediately at pump failure and pump off alarms.

If the manual switch condition input "ManSwCond" is configured as a maintenance switch (SYS-08 = 0), than the changeover can happen only if the switch is in auto mode.