Maintenance and Testing (cont’d)
Testing
A manual operator handle is provided with the transfer switch for maintenance purposes
only. Manual operation of the switch must be checked before it is operated electrically.
Both power sources
MUST be disconnected before manual operation of the switch. Insert
the handle and operate the transfer switch between the Normal and Emergency positions.
The transfer switch should operate smoothly without binding. Return the switch to the
Normal position, remove the handle, and return it to the holder provided.
After completing the inspection, cleaning and servicing of the transfer switch, reinstall the
switch cover, and close and lock the cabinet door. R
eclose the circuit breakers feeding the
utility and generator sources to the switch.
Initiate the electrical transfer test by activating the TS test switch. P timer will time out and the
microcontroller will send an engine start signal. When the W time has elapsed, the switch will
complete its transfer by closing into the Emergency source.
Deactivating the test switch will start retransfer to the Normal source. The switch will complete
its retransfer to Normal after the time delay of the T timer. The U engine overrun timer allows
the engine generator to run unloaded for a preset cool down period.
NOTICE
A periodic test of the transfer switch under load conditions is recommended to insure proper operation.
(See National Electric Code articles 700 and 701).
12
ZTSH Operation and Maintenance Manual (43R-1000)
Zenith Controls, Inc.
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General