Winco ASCO 300 G Design 1000-3000 Amp - Manual (Page 10)

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
SWITCH TEST button 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
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 Emergency
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
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 inphase
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 5–5)
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 the system
phase–to–phase voltage) between Transfer Switch
terminals NA and EA.
2. Manually start the generator. The voltmeter needle
should sweep back and forth at a regular rate
between 0 and about twice the system voltage.
3. Press and hold the 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 the Transfer Switch 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. Furnish Serial No., Bill of Material (BOM) No., & Catalog No. from the transfer switch nameplate.