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TESTING & SERVICE
(continued)
3-- 2
MANUAL LOAD TRANSFER
This procedure will manually transfer the load if the
controller is disconnected.
Do not manually operate the transfer switch
until both power sources are disconnected:
open both circuit breakers.
!
1. Open normal and emergency source circuit breakers.
2. Use the maintenance handle to manually operate
transfer switch to the opposite source. See page 1–3,
Manual Operation Test.
3. If the transfer switch is in the Emergency position
manually start the engine generator and then close
the emergency source circuit breaker.
TROUBLE-SHOOTING
Note the control features that are activated or furnished
on the switchand reviewtheir operation. Refer to Se ction
5, Control Features.
Proceed with care!
The automatic transfer switch is energized.
!
Table 3-1. Trouble-Shooting Checks.
P
R
O
B
L
E
M
CHECK IN NUMERICAL SEQUENCE
P
R
O
B
L
E
M
1OPERATION 2 GEN-SET 3VOLTAGE
Gen-Set does not start when
the TRANSFER SWITCH TEST
butto n is pressed and held for
15 seconds or when the
normal source fails.
Hold the TRANSFER SWITCH
TEST button 15 sec. or the
outage must be long enough
to allow for the 1 or 3 sec.
Momentary Normal Source
Outage Delay plus engine
cranking and starting time.
Starting control must be in
automatic position. Batteries
must be charged and
connec ted. Check wiring to
engine starting contac ts.
—
Transfer switch does not
transfer the load to
emergency s o urce after the
gen-set starts.
Wait for Transfer to Emergen-
cy Delay (0 to 5 min.) to time
out. For immediate transfer,
press the BYPASS TIME
DELAY button. If Motor Load
Transfer is active, wait for in-
phase condition (see below).
Generator output circuit
breaker must be closed.
Generator frequency must be
at least 57 Hz.
Voltmeter should read at
least 90% of nominal phase to
phase voltage between
transfer switch terminals EA
and EC (or EL1 and EL2 for 2
pole switches). *
* These are factory settings.
Transfer switch does not
transfer the load to normal
source when normal returns
or when TRANSFER SWITCH
TEST button is released.
Wait for Retransfer to Normal
Delay (1 sec. to 30 min.) to
time out. For immediate re–
transfer, press BYPASS TIME
DELAY button. If Motor Load
Transfer is active, wait for in-
phase condition (see below).
—
Voltmeter should read at least
90% of nominal phase to
phase voltage between
transfer switch terminals NB
and NC, NC and NA, and NA
and NB (or NL1 and NL2 for 2
pole switches).
Gen-Set does not stop after
load retransfer to the normal
source.
Wait for the 5 minute
Unloaded Running Delay to
time out.
Starting control must be in
automatic position.
—
Trouble-Shooting the Motor Load Transfer Feature (refer to page 5–3)
Use extreme caution when using a meter
to measure voltages in the following
steps. Do not touch power terminals;
sh oc k , burn s , or death cou ld res u lt !
1. Connect a voltmeter (set for twice system
phase–to–phase voltage) between Transfer Switch
terminals NA and EA.
2. Manually start generator. Voltmeter needle should
sweep back and forth at a regular rate between 0 and
about twice system voltage.
3. Press and hold
TRANSFER SWITCH TEST button.
The load should transfer to emergency source when
meter needle is near 0 volts. If transfer does not
occur, Motor Load Transfer feature is not operating.
4. Release t he Tran sfer Switch Te st button. The load
should retransfer back to the normal source after the
Retransfer to Normal Delay,ifused. Theretransfer
should occur when the needle is near 0 volts. If
retransfer does not occur after the time delay, the
Motor Load Transfer feature is not operating.
5. For immediate retransfer, press the BYPASS TIME
DELAY button. Then disconnect the voltmeter.
Ifthe problemisisolatedto ci rcuitson thecontrollerorthe transferswitch, callyourlocalASCOPowerTechnologies
sales office. Furnish Serial No., Bill of Material (BOM) No., & Catalog No. from the transfer switch nameplate.