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TESTING & SERVICE

(continued)

2-- 2

TROUBLE-SHOOTING

Note any opt ional accessories that may be furnished on

the ADTB and review their operation. Refer to any

separate drawings and/or instructions that may be

packed 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

1OPERATION 2 GEN-SET 3VOLTAGE

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

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 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.

W ait for Feature 2E time delay

to time out.

Starting control must be in the

automatic position.

---

Load Disconnect Active light

comes on.

W ait for load disconnect time

delay to time out.

Explanation: Transfer switch in delayed transition transfer mode.

Load disconnect time delay is adjustable from 0 to 5 min. 59 sec.

Load Disconnect Active light

staysonlongerthan6min.

Check load disconnect time

delay setting. Call ASI.

Explanation: Transfer switch contacts are open longer than 5

min. 59 sec (maximum setting). Load remains disconnected.

* These are factory settings. Refer to Controller User’s Guide.

If the pr ob l em is isol ated to circu its on the con trol l er or the transfer switch , call your local AS CO Power Techn ol og ies

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 C ontrol 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

eit her 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. TurntheBypassHandlecounterclockwiseto

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

&insertpin

Pull out shaft to operate

Emergency contacts.

Push in

shaft to operate

Normal contacts.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

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