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 switch and review their operation. Refer to
Section
5
,
Control Features
.
Proceed with care!
The automatic transfer switch is energized.
Table 3-1. Trouble-Shooting Checks.
PROBLEM
CHECK IN NUMERICAL SEQUENCE
PROBLEM
1 OPERATION
2 GEN-SET
3 VOLTAGE
Gen-Set does not start when
the
Transfer Test
button is
pressed and held for 15
seconds or when the normal
source fails.
Hold the
Transfer 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
connected. Check wiring to
engine starting contacts.
—
Transfer switch does not
transfer the load to
emergency source 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 inphase con-
dition (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 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 5–4)
Use extreme caution when using a meter
to measure voltages in the following
steps. Do not touch power terminals;
shock, burns, or death could result !
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 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 the
Transfer Test
button. The load should
retransfer back to the normal source after the
Retransfer to Normal Delay
, if used. The retransfer
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.
If the problem is isolated to circuits on the controller or the transfer switch, call your local ASCO Power Technologies
sales office, representative, or ASI. In United States, call 1–800–800–2726 or email [email protected]. In Canada,
call 1–888–234–2726. Furnish the Serial No., Bill of Material (BOM) No., & Catalog No. from transfer switch nameplate.
