TESTING & SERVICE
(continued)
2--2
TROUBLE-SHOOTING
Note any optional accessories that may be furnished on
the ACTB and review their operation. Refer to any sepa-
rate drawings and/or instructions that may be packed
with the ACTB.
Table 2-1. Trouble-Shooting Checks.
Hazardous voltage capable of causing shock,
burns, or death is used in this switch.
Do not touch the power or load terminals
of the bypass switch or transfer switch!
PROBLEM
CHECK IN NUMERICAL SEQUENCE
PROBLEM
1 OPERATION
2 GEN-SET
3 VOLTAGE
Engine–generator set does
not start when the
Transfer
Control
switch is turned and
held in
Transfer Test
position
or when normal source fails.
Hold
Transfer Test
switch 15
seconds or the outage must
be long enough to allow for
Feature 1C time delay plus
engine cranking and starting
.
Starting control must be in the
automatic position. Batteries
must be charged and
connected. Check wiring to
engine starting contacts.
–
Transfer switch does not
transfer the load to the
emergency source after the
engine–generator set starts.
Wait for Feature 2B time delay
to time out.
Generator output circuit
breaker must be closed.
Generator frequency must be
at least 95% of nominal (57 Hz
for a 60 Hz system.) *
Voltmeter should read at least
90% of nominal phase to
phase voltage between
terminals EA and EC (or EL1
and EL2 for 2 pole switches)*
Transfer switch does not
transfer the load to normal
source when normal returns
or when the
Transfer Control
switch is released.
Wait for Feature 3A time delay
to time out.
–
Voltmeter should read at least
90% of nominal phase to
phase voltage between
terminals NB and NC, NC and
NA, and NA and NB (or NL1
and NL2 for 2 pole switches).
Gen. does not stop after load
retransfer to normal source.
Wait for Feature 2E time delay
to time out.
Starting control must be in the
automatic position.
–
Failure to Synchronize
light comes on.
Conditions of Normal or Emergency Sources not suitable for closed transition transfer.
Recheck voltage and frequency of both sources. Press
Alarm Reset
pushbutton.
Extended Parallel Time
light comes on.
CN and CE contacts are closed longer than setting in the Control Panel. Open the discon-
nected source circuit breaker, then call your nearest ASCO Service Center for assistance.
TS Locked Out
light comes on.
Transfer lockout operation has occured; transfer switch is disabled from automatic operation.
Open the disconnected source circuit breaker, then call your nearest ASI for assistance.
* These are factory settings. Refer to
Controller User’s Guide
.
If the problem is isolated to circuits on the controller or the transfer switch, call your local ASCO Power Technologies sales
office or ASI at 1–800–800–2726. Furnish the Serial No. and Catalog No. from the transfer switch nameplate.
MANUAL LOAD TRANSFER
This procedure manually transfers load to other source if
the Transfer Switch or Control Panel are out of service.
Close enclosure doors to prevent personal
injury in case of electrical system fault.
1. Be sure that the Bypass Handle is
CLOSED
on either
Emergency or Normal (see page 3–1).
2. Be sure that the Isolation Handle is in the
TEST
or
ISOLATE
position (see page 3–2).
3. Turn the Bypass Handle counterclockwise to
OPEN
the Bypass Switch. Then Bypass to the other source
(see page 3–1).
MAINTENANCE HANDLE
Bypass and isolate the Transfer Switch before
using the maintenance handle! See pages 3–1
and 3–2. Remove the hub and handle after
using them and store on frame.
Turn counterclockwise
to OPEN contacts.
Turn clockwise to
CLOSE contacts.
insert
handle
into hole
Grasp
handle
firmly
slide hub
onto shaft
& insert pin
Pull out shaft to operate
Emergency contacts.
Push in shaft to operate
Normal contacts.
