GE Industrial Solutions ZBTSCTH SERIES 100 - 4000 AMPS - Manual (Page 7)

ZBTSCTH Operation and Maintenance Manual (46R-7000) Zenith Controls, Inc. 5
SECTION I - INSTALLATION
(Continued)
Figure 3
6. FINAL EQUIPMENT INSPECTION
Prior to energizing the transfer switch:
a. Remove any debris incurred due to
shipment or installation. DO NOT use a
blower since debris may become lodged in
the electrical and mechanical components
and cause damage. Use of a vacuum is
recommended.
b. Verify that all cabled connections are
correct and that phase rotation of both
sources match.
c. Check engine start connections and verify
the correct connection of all control wires.
d. Check settings of all timers and adjust as
necessary. Also adjust any optional
accessories as required. [See MX200
manual (50R-2000) for instructions on
timer and option adjustments.]
e. Check the integrity of power connections
by verifying actual lug torque values as
specified in this manual.
f. Make sure that all covers and barriers are
installed and properly fastened.
7. FUNCTIONAL TEST
The functional testing of the transfer switch
consists of electrical tests described in this
section. Before proceeding, refer to the
information package supplied with the transfer
switch. Read and understand all instructions and
review the operation of all accessories provided.
Before starting the operation test, check the
equipment rating nameplate on the transfer
switch to verify the correct system voltage. An
example of the equipment rating nameplate is
shown in Figure 3.
To begin the test, close the Normal source circuit
breaker. Phase relays B1, B2, and B3 will pick
up and the LED indicators will illuminate. Verify
the phase to phase voltages at the Normal line
terminals.
Next, close the Emergency source breaker and
start the engine generator. The VFSM relay will
pick up and the LED indicator will illuminate.
Check the phase to phase voltages at the
Emergency line terminals. Also, verify that the
phase rotation of the Emergency source is the
same as the phase rotation of the Normal
source.
After the sources have been verified, shut down
the engine generator, and put the starting control
in the automatic position. Complete the visual
inspection of the transfer switch, and close and
lock the cabinet door.
Initiate the electrical transfer test by activating
the test switch (TS). This de-energizes the
engine start relay. The transfer switch closes into
Emergency only after the sync-check relay
ensures the proper phase relationship of both
sources. After the transfer switch closes into
Emergency, the SE limit switch becomes
activated to de-energize the CCE relay and
energize the CCNO relay. This opens the
transfer switch out of Normal. When the transfer
switch has opened out of Normal, the SNO-2
limit switch activates to de-energize the CCNO
relay. The transfer switch has now closed into
Emergency power without interrupting the load.
Turning the TS to AUTO initiates re-transfer to
Normal. The transfer switch closes into Normal
only after the sync-check relay ensures the
proper phase relationship of both sources. After
the transfer switch closes into Normal, the SN
limit switch becomes activated (de-activated in
400 Amp units) to de-energize the CCN relay and
energize the CCEO relay; the transfer switch
opens out of Emergency. Then the SEO-2 limit
switch activates to de-energize the CCEO relay.
The transfer switch has now closed back into
Normal power without interrupting the load.
The transfer switch defaults to an open transition
transfer when the Normal source fails. Closed
transition transfer is not possible with one source
available. Open transition transfer for testing can
be selected via the transition mode selector
switch. (For a description of the Open Transition
sequence of operation, refer to Section II -
Operation and Features, page 6.)
A 24 VDC circuit is supplied to control the alarm
and warning indicators. To ensure continuous
power to this circuit, a constant 24 VDC can be
supplied by the customer from the engine start
battery.
NOTICE !
A periodic test of the transfer switch under
load conditions is recommended to insure
proper operation.