Limited to a single set of NC control-relay contacts, running overload protection poses a problem with a reversing motor-starter simply because the reversing circuit consists of only one other 3-pole power contactor.
The single set NC overload-relay contacts must be wired in series with both directional power-contactor solenoids to provide overload-overcurrent protection for the electric motor in either direction of rotation.
If the control circuit is not ___________, then the common side of the two directional power-contactor solenoids can be paralleled and wired in series with the single set of NC overload-relay control contacts to the common (or return) side of the control circuit.
A) all of the answers
B) ungrounded
C) grounded
D) none of the answers
Show Answer
Answer:C
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