TESTING & SERVICE (continued)
2 --- 2
MANUAL LOADTRANSFER
This procedure will manually transfer the load if the
controller is disconnect ed.
Do not manually operate the transfer switch
until both power sources are disconnected
(all conductors deenergized).
1. Deenergize both the normal and emergency source
conductors (remove fuses or open circuit breakers).
2. Use the maintenance handle to manually operate the
transfer switch to the opposite source. First open the
closed contacts, the n close the other contacts. Do not
try to close both Normaland Emergency contact.See
Manual Operation on page 1–3 through 1–6.
3. Then remove the mainte nanceha ndle..
Verifythat the maintenance handle
has been removed before proceeding!
4. If the transfer switch is in the Emergency position
manually start the engine generator and then install
emergencysourcefuseorclosethecircuitbreaker.
TROUBLE-SHOOTING
Note any optional accessories that may be furnished on
the ADTS and review their operation. Refer to any
separatedrawingsand/or instructions that may be packed
with the ADTS. Hazardous voltagecapable of causing shock,
burns, or death is used in this switch.
Do not touch thepower or load terminals
of the transfer switch!
Table2-1. Trouble-ShootingChecks.
P
R
O
B
L
E
M
CHECK IN NUMERICAL SEQUENCE
P
R
O
B
L
E
M
1OPERATION 2 GEN-SET 3VOLTAGE
Engine–generator set does
not start when the Tran sfe r
Controlswitch is turned and
held in Transfer Testposition
or when normal source fails.
Hold TransferTest switch 15
secondsor the outage must
be long enough to allow for
Feature1Ctimedelayplus
engine cranking and starting.
Starting controlmust be in the
automatic position. Batteries
must be chargedand
connected. Checkwiring to
engine starting contacts.
---
Transfersw itch 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 outputcircuit
breaker must be closed.
Generator frequency must be
at least 95% of nominal (57 Hz
for a 60 Hz system.) *
Voltmetershould read at least
90% of nominal phase to
phase voltage between
terminals EA and EC (or EL1
and EL2 for 2 pole switches)*
Transfersw itch 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.
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Voltmetershould read at least
90% of nominal phase to
phase voltage between
terminals NB and NC, NC and
NA, and NA and NB (orNL1
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 controlmust be in the
automatic position. ---
* These are factory settings. Refer to Group 5 Controller User’s Guide.
If the problem is isolated to circuitson thecontroller or the transfer switch, call your local ASCO PowerTechnologies
salesof fice orASI: in the United States, call 1–800–800–2726 or in Canada call 1–888–234–2726. Furnish the Serial No.,
Catalog No., and Bill of Material (BOM) No. from the transfer switch nameplate.