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TESTING & SERVICE
(continued)
2 --- 2
TROUBLE- SHOOTING
Note any optional accessories that may be furnished on
the ADTB and review their operation. Refer to any
separatedrawingsand/orinstructionsthat maybepacked
with the ADTB.
Hazardous voltage capable of causing shock,
burns, or death is used in this switch.
Do not touch the power or load terminals
ofthebypassswitchortransferswitch!
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 c ircuit
breaker must be closed.
Generator frequency must be
at least 95% of nominal (57 Hz
for a 60 Hz system.) *
Voltmeter sho uld 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). *
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 sho uld 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).
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 to Controller User’s Guide.
If the problemis isolated to circuitson thecontrolleror the transferswitch,callASI oryourlocalASCOPowerTechnolo-
gies sales office. Furnish the Serial No., Catalog No., & BOM 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 surethat the BypassHandleis CLOSED oneither
Emergency or Normal (see page 3–1).
2. Be sure that the Isolation Handle is in the TEST or
ISOLA TE position (see page 3–2).
3. TurntheBypassHandlecounterclockwisetoOPEN
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
&insertpin
Pull out shaft to operate
Emergency contacts.
Push in
shaft to operate
Normal contacts.