TESTING & SERVICE

(continued)

MANUAL LOAD TRANSFER

2.

Use manual handle to manually operate transfer

This procedure will manually transfer the load if the

 

switch to the opposite source. First open the

 

closed transfer switch, then close the other transfer

control panel is disconnected.

 

 

switch.

 

 

 

 

 

3.

Then remove the maintenance handle. See page 1–3.

 

 

 

 

Do not manually operate the transfer switch

 

 

 

 

 

 

until both power sources are disconnected

 

 

 

 

 

 

 

Verify that the maintenance handle

(all conductors deenergized).

 

 

 

has been removed before proceeding!

1. Deenergize both the normal and emergency source

 

4. If the transfer switch is in the Emergency position

conductors (remove fuses or open circuit breakers).

 

 

manually start the engine generator and then

 

 

 

 

install emergency source fuse or close the circuit

 

 

breaker.

TROUBLE-SHOOTING

Note any optional accessories that may be furnished on the ADTS and review their operation. Refer to any separate drawings and/or instructions that may be packed with the ADTS.

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.

PROBLEM

CHECK IN NUMERICAL SEQUENCE

1

2

3

 

OPERATION

GEN-SET

VOLTAGE

Engine–generator set does

Hold Transfer Test switch 15

Starting control must be in the

 

not start when the Transfer

seconds or the outage must

automatic position. Batteries

 

Control switch is turned and

be long enough to allow for

must be charged and

---

held in Transfer Test position

Feature 1C time delay plus

connected. Check wiring to

 

or when normal source fails.

engine cranking and starting.

engine starting contacts.

 

 

 

 

 

Transfer switch does not

Wait for Feature 2B time delay

Generator output circuit

Voltmeter should read at least

transfer the load to the

to time out.

breaker must be closed.

90% of nominal phase to

emergency source after the

 

Generator frequency must be

phase voltage between

engine–generator set starts.

 

at least 95% of nominal (57 Hz

terminals EA and EC (or EL1

 

 

for a 60 Hz system.) *

and EL2 for 2 pole switches)*

 

 

 

 

Transfer switch does not

Wait for Feature 3A time delay

 

Voltmeter should read at least

transfer the load to normal

to time out.

 

90% of nominal phase to

source when normal returns

 

---

phase voltage between

or when the Transfer Control

 

terminals NB and NC, NC and

 

 

switch is released.

 

 

NA, and NA and NB (or NL1

 

 

 

and NL2 for 2 pole switches).

 

 

 

 

Gen. does not stop after load

Wait for Feature 2E time delay

Starting control must be in the

---

retransfer to normal source.

to time out.

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 at 1–800–800–2726. Furnish the Serial No. and Catalog No. from the transfer switch nameplate.

2---

2

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Emerson FDESIGN 30004000A, GDESIGN 10004000A, FDESIGN 600800A manual Manual Load Transfer, Trouble-Shooting
Page 9 Page 11

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