TESTING & SERVICE (continued)
3 --- 2
MANUAL LOAD TRANSFER
This procedure will manually transfer the load if the
controller is disconnect ed.
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. Seepage 1–3,
Manual OperationTest.
3. If the transfer switch is in the Emergency position
manually start the engine generator and then close
the emergency source circui t breaker.
TROUBLE-SHOOTING
Notethe control features that are activated or furnished
onthe switch and review their operation. Refer to Section
5,Control Features.
Proceed with care!
The automatic transfer switch is energized.
Table3-1. 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 Testbutton is
pressed and held for 15
seconds orwhen thenormal
source fails.
Hold theTransfer Test button
15sec.ortheoutagemustbe
long enough to allow for the 1
or 3 sec. MomentaryNormal
Source Outage Delay plus
engine cranking and starting
time.
Starting controlmust be in
automatic position. Batteries
must be chargedand
connected. Checkwiring to
engine starting contacts.
—
Transfersw itch does not
transfer the load to
emergency source after the
gen-set starts.
Wait for Transfer to Em ergen-
cy Delay(0 to 5 m in.) to time
out. Forimmediate transfer,
press the Bypass Time Delay
button. If Motor Load Transfer
is active, wait for inphase con-
dition (seebelow).
Generator outputcircuit
breaker must be closed.
Generator frequency must be
at least 57 Hz.
Voltmetershould read at least
90% of nominal phase to
phase voltage between
transfer switch terminals EA
and EC (orEL1 and EL2 for 2
pole switches).*
* These are factory settings.
Transfersw itch does not
transfer the load to normal
source when normal returns
or when Transfer Testbutton
is released.
Wait for Retransfer to Normal
Delay (1 sec. to 30 min.) to
time out. For immediate re–
transfer,p ress Bypass Time
Delay button. If Motor Load
Transferis active, wait for in-
phase condition (see below).
—
Voltmetershould read at least
90% of nominal phase to
phase voltage between
transfer switch terminals NB
and NC, NC and NA, and NA
and NB (orNL1 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 controlmust be in
automatic position. —
Trouble-Shooting the Motor Load Transfer Feature (refer to page 5–4)
Use extreme caution when using a meter
to measure voltage s in the following
steps. Do not touch power terminals;
shock, burns, or deathcould result !
1. Connect a voltmeter (set for twice system
phase–to–phase voltage) between Transfer Switch
terminalsNA and EA.
2. Manually start generator. Voltmeter needle should
sweepback and forth at a regular rate between 0 and
about twice system voltage.
3. Pressand hold Transfer Testbutton. The loadshould
transfer to emergency sourcewhen meter needle is
near 0 volts. If transfer does not occur, Motor Load
Transferfeature is not operating.
4. Release the Transfer Test button. The load should
retransfer back to the normal source after the
Retransfer to NormalDelay,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 t he Bypass Time
Delay button. Then disconnectthe voltmeter.
If the problem is isolated to circuitson the controller orthe transfer switch, call your loca l ASCO PowerTechnologies
sales office, representative, or ASI. In United States, call 1–800–800–2726 or email customercare@asco.com. Furnish
the Serial No., Billof Material (BOM) No., & Catalog No. from transfer switch nameplate.