Emerson Series 300 H-design User Manual download pdf (Page 12)

TESTING & SERVICE

(continued)

3 --- 2

MANUAL LOAD TRANSFER

This procedure will manually transfer the load if the

controller is disconnected.

Do not manually operate the transfer switch

until both power sources are disconnected:

open both circuit breakers.

1. Open normal and emergency source circuit breakers.

2. Use the maint enance handle to manually operate

transfer switch to the opposite source. See page 1–3,

Manual Operation Test.

3. If the transfer switch is in the Emergency positi on

manually start the engine generator and then close

the emergency source circuit breaker.

TROUBLE- SHOOTING

Note the control features that are activated or furnished

on theswitch and reviewtheir operation. Refer to Section

5, Control Features.

Proceed with care!

The automatic transfer switch is energized.

Table 3-1. Trouble-Shooting Checks.

CHECK IN NUMERICAL SEQUENCE

1OPERATION 2 GEN-SET 3VOLTAGE

Gen-Set does not start when

the Transfer Test button is

pressed and held for 15

seconds or when the normal

source fails.

Hold the Transfer Test button

15sec.ortheoutagemustbe

long enough to allow for the 1

or 3 sec. Momentary Normal

Source Outage Delay plus

engine cranking and starting

time.

Starting control must be in

automatic position. Batteries

must be charged and

connec ted. Check wiring to

engine starting contacts.

—

Transfer switch does not

transfer the load to

emergency source after the

gen-set starts.

Wait for T ransfer to Emergen-

cy Delay (0 to 5 min.) to time

out. For immediate transfer,

press the Bypass Time Delay

button. If Motor Load Transfer

is active, wait for inphase con-

dition (see below).

Generator output circuit

breaker must be closed.

Generator frequency must be

at least 57 Hz.

Voltmeter should 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). *

* These are factory settings.

Transfer switch does not

transfer the load to normal

source when normal returns

or when Transfer Test button

is released.

Wait for Retransfer to Normal

Delay (1 sec. to 30 min.) to

time out. For immediate re–

transfer, press Byp ass Time

Delay button. If Motor Load

Transfer is active, wait for in-

phase condition (see below).

—

Voltmeter should 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).

Gen-Set does not stop after

load retransfer to the normal

source.

Wait for the 5 minute

Unloaded Running Delay to

time out.

Starting control must be in

automatic position.

—

Trouble-Shooting the Motor Load Transfer Feature (refer to page 5–4)

Use extreme caution when using a meter

to measure voltages in the following

steps. Do not touch power terminals;

sh oc k , burns , or death could result !

1. Connect a voltmeter (set for twice system

phase–to–phase voltage) between Transfer Switch

terminals NA and EA.

2. Manually start generator. Voltmeter needle should

sweep back and forth at a regular rate between 0 and

about twice system voltage.

3. Press and hold

Transfer Test button. The load should

transfer to emergency source when meter needle is

near 0 volts. If transfer does not occur, Motor Load

Transfer feature is not operating.

4. Release the Transfer Test button. The load should

retransfer back to the normal source after the

Retransfer to Normal Delay,ifused. Theretransfer

should occur when the needle is near 0 volts. If

retransfer does not occur after the ti me delay, the

Motor Load Transfer feature is not operating.

5. For immediate retransfer, press the Bypass Time

Delay button. Then disconnect the voltmeter.

If the problem is isolated to c ircuits on the c ontroller or the transfer switch, ca ll your loc al ASCO Power Techno logies

sales office, representative, or ASI. In United States, call 1–800–800–2726or email [email protected] m. InCanad a,

call 1–888–234–2726. Furnish the Serial No., Bill of Material (BOM) N o., & Catalo g No. from transfer switch nameplate.

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Emerson Series 300 H-design User Manual Page 12

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