GE Industrial Solutions Entelli-Switch 250 - Manual (Page 20)

■ 20 GE Zenith Controls ■ Entelli-Switch 250 Operation and Maintenance Manual (71R-2000A)
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 electrically.
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 microcon-
troller 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 preset 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, GE Zenith
recommends that a GE 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.