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GE Zenith Controls 21
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Entelli-Switch 250 Operation and Maintenance Manual (71R-2000)
Entelli-Switch 250
Testing
(cont’d)
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)
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, FAST TEST and NO XFR (See Figure 11).
• XFR LOAD test starts the generator and using
the current timer settings, transfers the load
to Source 2.
• FAST TEST test 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 XFR test 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.
Standard Transition
When the test is initiated, the controller initiates the Time Delay
Source 2 Start Timer (Engine Start Timer "P") cycle. A manual
CANCEL button is provided to cancel the test if desired. 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 Source 2 Timer (W) begins its
timing cycle to ensure voltage and frequency stabilization before
transfer. A manual pushbutton BYPASS is provided to bypass the
"W" time delay if desired. After the (W) time delay, the CCE relay
energizes the CE solenoid to close the transfer switch in to Source
2. The SE limit switch activates to de-energize the CCE relay.
Restoration of Source 1 Power:
Deactivating the test switch initiates re-transfer to Source 1
sequence.The delay to Source 1 Timer (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 CCN relay energizes
the CN solenoid to retransfer the switch to Source 1. The SN limit
switch activates to de-energize the CCN relay.
Immediately after re-transfer, the S2 Stop Delay Timer (Delay
to Engine Stop "U") begins its cycle to allow Source 2 Engine
Figure 11
SYSTEM TEST
FAST XFR NO
MORE TEST LOAD XFR
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.
Delayed Transition
Source 1 Power Failure:
When the test is initiated, the controller initiates the Time
Delay Source 2 Start (Engine Start Timer "P") cycle. A manual
CANCEL button is provided to cancel the test if desired 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 sta-
bilization before re-transfer. A manual pushbutton BYPASS is
provided to bypass the "W" time delay if desired. After the (W)
time delay, the CCNO relay energizes the CNO solenoid to
open the transfer switch out of Source 1 position. The time
delay to Source 2 timer (DW) begins its timing cycle. After the
(DW) time delay, the CCE relay energizes. The switch then
completes transfer to Source 2 by energizing the CE solenoid.
The SE limit switch activates to de-energize the CCE relay.
Restoration of Source 1 Power:
Deactivating the test switch initiates re-transfer to Source
1sequence.The delay to open Source 2 Timer (T) begins its tim-
ing 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 CCEO relay
energizes the CEO solenoid to open the switch out of Source 2
position. The time delay to Source 1 timer (DT) begins its timing
cycle. After the (DT) time delay, the CCN relay energizes the CN
solenoid to complete re-transfer of the switch to Source 1. The SN
limit switch activates to de-energize the CCN relay.
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.