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Why is the Group G retrofit controller not accepting the Emergency Source?
This issue is commonly raised on three-phase Series 300 Group 1 units installed with the retrofit Group G controller. The legacy ASCO Series 300 in Group 1 only has two sensing leads on the Emergency source side tapped to the A and C poles. Hence, if the retrofit Group G controller is set to three-phase sensing for the Emergency source, the controller will get incorrect readings on the Vab and Vbc values due to the missing sensing lead on the B pole of the Emergency source and would consequently take the Emergency source as unacceptable.
The corrective action to take is to set the Group G retrofit controller to single-phase sensing for the Emergency source, that is, set S1 actuator 9 to OFF while keeping S1 actuator 8 to ON for three-phase sensing on the Normal source side. All other DIP switches and the jumper card must be adjusted to match the voltage of the target unit.
The corrective action to take is to set the Group G retrofit controller to single-phase sensing for the Emergency source, that is, set S1 actuator 9 to OFF while keeping S1 actuator 8 to ON for three-phase sensing on the Normal source side. All other DIP switches and the jumper card must be adjusted to match the voltage of the target unit.
Published for:ASCO Power Technologies USA
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