GE Industrial Solutions Entelli-Switch 250 - Manual (Page 21)

■ GE Zenith Controls 21 ■ Entelli-Switch 250 Operation and Maintenance Manual (71R-2000A)
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, 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 fre-
quency 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 pushbut-
ton 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-E to operate the main transfer opera-
tor. 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 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 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.
Figure 11
S Y S T E M T E S T
F A S T X F R N O
M O R E T E S T L O A D X F R
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.
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 stabilization before re-transfer. A man-
ual 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 mechani-
cally locked. SN limit switch awaits the next operation to Source 1.
Restoration of Source 1 Power:
Deactivating the test switch initiates re-transfer to Source 1
sequence.The delay to open Source 2 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 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 contoller 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.
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)