ABB Zenith
19
ZTSCT / ZBTSCT Operation & Maintenance Manual
Testing
Introduction
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 electri-
cally.
Both power sources must be disconnected
before manual operation of the switch.
Insert the
handle and operate the transfer switch between the Source 1
and Source 2 positions. The transfer switch should operate
smoothly without binding. Return the switch to the
Source 1 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. Reclose the circuit breakers
feeding the utility and generator sources to the switch.
Initiate the electrical transfer test by activating the 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 Source 2.
Deactivating the test switch will start retransfer to Source 1.
The switch will complete its retransfer to Source 1 after
the time delay of the T timer. The U engine overrun timer
allows the engine generator to run unloaded for a pre-
set cool down period.
Test Options
The ATS can be tested in either of two positions:
1) “Auto Position”
Full Transfer Test - This test checks the complete
operation of the ATS by transferring the load’s
power source from Source 1 to Source 2.
2) “Test Position”
This procedure is recommended for Preventive
Maintenance (PM) of ATS without interrupting the
Load thru the BYPASS/ISOLATION SWITCH.
NOTE
:
A periodic test of the transfer switch
under load conditions is recommended
to insure proper operation. (See National
Electric Code articles 700 and 701).
CAUTION
Due to hazardous voltage and current,
ABB
Zenith
recommends that an
ABB
Zenith Certified technician
or a qualified electrician must perform the
installation and maintenance of the switch.
WARNING
Both power sources must be disconnected
before manual operation of the switch.
WARNING
When performing a hi-pot or dielectric test
on the power section, DISCONNECT the
control panel plugs from the microprocessor
to avoid potential damage.
