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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
Feature1Ctimedelayplus
engine cranking and star ting.
Starting control must be in the
automatic position. Batteries
must be charged and
connec ted. Check wiring to
engine starting contacts.
---
Transfer switch does not
transfer the load to the
emergency source after the
engine–generator set starts.
W ait 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.
W ait for Feature 3A time delay
to time out.
---
Voltmeter should read at l east
90% of nominal phase to
phase voltage between
transfer switch terminals NB &
NC, NC & NA, & NA & NB (or
NL1&NL2for2pole).
Engine–generator-set does
not stop after load retransfer
to the normal source.
W ait for Feature 2E time delay
to time out.
Starting control must be in the
automatic position.
---
* These are factory settings. Refer t o 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
turnit back toBYPASS POS(select opposite source):
- Emergency Source - pull out the handle
- Normal Source - push in the handle
Figure 2–1. Bypass Handle.