20 GE Zenith Controls ■
ZTSCT / ZBTSCT Operation and Maintenance Manual (71R-5000A)
Testing (cont’d)
ATS Testing
Start generator and verify proper voltage, frequency and phase
sequence (match to Source 1). Shut down gen set and place in
Auto. Complete the visual inspection of the transfer switch, and
close the cabinet door.
Initiate the test by pressing the TEST button on the LCD
keypad. The controller will then prompt for your access code.
After entering the code, three test options will appear—
XFR LOAD, FASTTEST and NO XFR (See Figure 12).
• XFR LOADtest starts the generator and using
the current timer settings, transfers the load
to Source 2.
• FAST TESTtest presets timer values to a maximum
30 seconds during the test. After completion of
the test, all timers are reset to their original
values. (T3, W3, DT and DW remain)
• NO XFRtest starts the generator but does not
transfer the load to the Source 2.
Press and hold the desired test option button until the switch
transfers to Source 2 (load test) or until the generator has
been run for the desired amount of time (no load test).
Releasing the test button before W timer timeout will abort
the test (Exception: when the transfer commit option, is
configured “ON”).
To test lamps, press TEST then scroll through MORE, then
press LAMP TEST. To cancel LAMP TEST press MORE.
Figure 12
Open Transition
Source 1 Power Failure:
When a Test is initiated, the controller initiates the initiates
the Time Delay Source 2 Start (Engine Start Timer "P")
cycle. Upon completion of the (P) time delay, an Engine
start Signal is sent to Source 2. When Source 2 voltage and
frequency reach the preset "Restore" values, the time delay
to open Source 1 timer (W) begins its timing cycle to
ensure voltage and frequency stabilization before re-transfer.
A manual pushbutton BYPASS is provided to bypass the
"W" time delay if desired. After the (W) time delay, the
MX controller initiates a transfer signal through the
SCR-NO to operate the main transfer operator. The
load is now transferred to the Open position. The time
delay to Source 2 timer (DW) begins its timing cycle.
After the (DW) time delay, the MX controller initiates a
transfer signal through the SCR-E to operate the main
transfer operator. The load is now transferred to Source
2 line. The transfer switch is mechanically locked. SN
limit switch awaits the next operation to Source 1.
Restoration of Source 1 Power:
Deactivating the Test switch initiates the re-transfer. When
Source 1 power reach the preset "Restore" values, the
controller initiates re-transfer to Source 1sequence. The
delay to open Source 2Timer (T) begins its timing cycle
to ensure voltage and frequency stabilization before
retransfer. A manual pushbutton BYPASS is provided to
bypass the "T" time delay if desired. After the (T) time
delay, the MX controller initiates a transfer signal through
the SCR-EO to operate the main transfer operator. The
load is now transferred to the Open position. The time
delay to Source 1 timer (DT) begins its timing cycle.
After the (DT) time delay, the MX controller initiates a
transfer signal through the SCR-N to operate the main
transfer operator. The load is now transferred to Source
1 line. The transfer switch is mechanically locked. SE
limit switch awaits the next operation to Source 2.
Immediately after re-transfer, the S2 Stop Delay Timer
(Delay to Engine Stop "U") begins its cycle to allow Source
2 Engine to run unloaded. A manual pushbutton BYPASS
is provided to bypass the "U" time delay if desired. Upon
completion of the (U) timing cycle, the controller sends
an Engine stop signal.
SYSTEM TEST
FAST XFR NO
MORE TEST LOAD XFR
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)