5-22 Accessory Troubleshooting
TP-5672 11/95
Main Shaft Auxiliary Dry Contacts
One main shaft auxiliary dry contact, option DD-15-A, is
supplied standard on 600 volt class transfer switches.
DD-15-Aismountedonthetransferswitch. Thelocation
of the auxiliary contacts varies according to the ampere
size and type of power conversion unit. One set of
auxiliary contacts is closed when the transfer switch is
connectedtothenormalsource. Onesetis closedwhen
the transfer switch is connected to the emergency
source. Refer to the power conversion unit service
manual for troubleshooting.
Additional accessory DD-15 contacts available are
described below.
D DD-15-E. This accessory has one additional
contact which is closed when the transfer switch is
connected to the normal source.
D DD-15-F. This accessory has one additional
contact which is closed when the transfer switch is
connected to the emergency source.
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