TRENDnet Series 300 manual Testing & Service, Manual Load Transfer, Trouble-Shooting

Page 10

TESTING & SERVICE (continued)

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 maintenance 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 position 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 the switch and review their operation. Refer to Section

 

 

 

 

 

 

 

 

 

 

 

5, Control Features.

 

 

Proceed with care!

 

 

 

 

The automatic transfer switch is energized.

 

 

Table 3-1. Trouble-

Shooting Checks.

 

 

 

 

 

 

 

 

 

PROBLEM

CHECK IN NUMERICAL SEQUENCE

 

1 OPERATION

 

2 GEN-SET

 

 

3 VOLTAGE

 

 

 

 

 

 

Gen-Set does not start when

Hold the TRANSFER SWITCH

Starting control must be in

 

 

 

 

the TRANSFER SWITCH TEST

TEST button 15 sec. or the

automatic position. Batteries

 

 

 

 

button is pressed and held for

outage must be long enough

must be charged and

 

 

 

 

15 seconds or when the

to allow for the 1 or 3 sec.

connected. Check wiring to

 

 

—

 

normal source fails.

Momentary Normal Source

engine starting contacts.

 

 

 

 

 

Outage Delay plus engine

 

 

 

 

 

 

 

cranking and starting time.

 

 

 

 

 

 

 

 

 

 

 

Transfer switch does not

Wait for Transfer to Emergen-

Generator output circuit

Voltmeter should read at

 

transfer the load to

cy Delay (0 to 5 min.) to time

breaker must be closed.

least 90% of nominal phase to

 

emergency source after the

out. For immediate transfer,

Generator frequency must be

phase voltage between

 

gen-set starts.

press the BYPASS TIME

at least 57 Hz.

transfer switch terminals EA

 

 

DELAY button. If Motor Load

 

 

and EC (or EL1 and EL2 for 2

 

 

Transfer is active, wait for in-

 

 

pole switches). *

 

 

phase condition (see below).

 

 

* These are factory settings.

 

 

 

 

 

 

 

Transfer switch does not

Wait for Retransfer to Normal

 

 

Voltmeter should read at least

 

transfer the load to normal

Delay (1 sec. to 30 min.) to

 

 

90% of nominal phase to

 

source when normal returns

time out. For immediate re–

 

 

phase voltage between

 

or when TRANSFER SWITCH

transfer, press BYPASS TIME

 

—

transfer switch terminals NB

 

TEST button is released.

DELAY button. If Motor Load

 

 

and NC, NC and NA, and NA

 

 

Transfer is active, wait for in-

 

 

and NB (or NL1 and NL2 for 2

 

 

phase condition (see below).

 

 

pole switches).

 

 

 

 

 

 

 

 

Gen-Set does not stop after

Wait for the 5 minute

Starting control must be in

 

 

 

 

load retransfer to the normal

Unloaded Running Delay to

automatic position.

 

 

—

 

source.

time out.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Trouble-Shooting the Motor Load Transfer Feature (refer to page 5–3)

Use extreme caution when using a meter to measure voltages in the following steps. Do not touch power terminals; shock, burns, or death could result !

3.Press and hold TRANSFER SWITCH 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 Switch Test button. The load should retransfer back to the normal source after the

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.

Retransfer to Normal Delay, if used. The retransfer

should occur when the needle is near 0 volts. If retransfer does not occur after the time 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 circuits on the controller or the transfer switch, call your local ASCO Power Technologies sales office. Furnish Serial No., Bill of Material (BOM) No., & Catalog No. from the transfer switch nameplate.

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Page 9 Page 11
Contents Operator’s Manual Nameplate Catalog Number Indentification 1000 1200 1600 2000 2600 3000Installation Engine Starting Contacts Source fails Transfer switchController Ground Auxiliary CircuitsATS Position Indicators Installation Functional TestManual Operation Test Voltage Checks InstallationUse a phase rotation meter to Black circle means light is onElectrical Operation Sequence of Operation Transfer To EmergencyTesting & Service Preventive MaintenanceProceed with care Automatic transfer switch is energized Testing & ServiceTROUBLE-SHOOTING Manual Load TransferSensor Adjustments AdjustmentsTime Delay Adjustment Time Delay SettingsHow to Change a Setting AdjustmentsClose the enclosure door BUILT-IN Engine Exerciser DIP Switch SettingsHow to Set Built-In Timer Step Function Explanation Push Button Status LightControl Features Optional Programmable Engine Exerciser Accessory 11CDChanging or Checking Time Programs Setting the Clock Time and DayCanceling Time Programs Programming Engine On-Off PeriodsInphase Monitor For Motor Load Transfer Load Disconnect FeatureStrip Heater Accessory ControlsIndex

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