TESTING & SERVICE
(continued)
2--2
TROUBLE-SHOOTING
Note any optional accessories that may be furnished on
the ATB and review their operation. Refer to any sepa-
rate drawings and/or instructions that may be packed
with the ATB.
Hazardous voltage capable of causing shock,
burns, or death is used in this switch.
Do not touch the power or load terminals
of the transfer switch!
Table 2-1. Trouble-Shooting Checks.
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
transfer switch terminals EA &
EC (or EL1 & EL2 for 2 pole)*
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
transfer switch terminals NB &
NC, NC & NA, & NA & NB (or
NL1 & NL2 for 2 pole).
Engine–generator-set does
not stop after load retransfer
to the normal source.
Wait for Feature 2E time delay
to time out.
Starting control must be in the
automatic position.
---
* 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. In the United States, call 1–800–800–2726. In Canada, call 1–888–234–2726. Furnish the Serial No.,
Bill of Material (BOM) 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 all enclosure doors to prevent personal
injury in case of electrical system fault.
!
1. Be sure that the Bypass Handle is in the
BYPASS
POS
(position) (see page 3–1).
2. Be sure that the Isolation Handle is in the
TEST
or
DISCONNECTED
position (see page 3–2).
3. Turn the Bypass Handle clockwise to
AUTOMATIC
POS
(position).
4. Then pull–out or push–in the Bypass Handle and
turn it back to BYPASS POS (select opposite source):
- Emergency Source - pull out the handle
- Normal Source - push in the handle
Figure 2–1. Bypass Handle.
