TRENDnet Series 300 User Manual

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Operator’s

Manual

Series 300 Automatic Transfer Switches

G design 1000 through 3000 amps

1000, 1200, 1600 amp. sizes

DANGER is used in this manual to warn of high voltages capable of causing shock, burns, or death.

!

WARNING is used in this manual to warn of possible personal injury.

!

CAUTION is used in this manual to warn of possible equipment damage.

Refer to the outline and wiring drawings provided with ASCO Series 300 ATS for all installation details.

2000 amp. size

An experienced licensed electrician must install the ATS.

TABLE OF CONTENTS

section

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SEQUENCE OF OPERATION . . . . . . . . . . . . . 2

TESTING & SERVICE . . . . . . . . . . . . . . . . . . . .

3

ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . 4

CONTROL FEATURES . . . . . . . . . . . . . . . . . . . 5

INDEX . . . . . . . . . . . . . . . . . . . . . . . . . back cover

ASCO POWER TECHNOLOGIES L.P. 50 Hanover Road, Florham Park, New Jersey 07932 USA www.asco.com

381333–122B

Nameplate

Catalog Number Indentification

The Transfer Switch nameplate includes data for each specific ASCO Series 300 ATS. Use the ATS only within the limits shown on this nameplate.

A typical Catalog Number is shown below with its elements explained. The example is for a G–designSeries 300 ATS with switched neutral, 3 pole, 2000 amp, 480 V, in a Type 1 enclosure:

G300

3

2000

N

1

C

Neutral

 

 

Phase Poles

 

Amperes

B – switched

 

2

– single Ø

 

1000

C – overlapping

 

3

– three Ø

 

1200

blank – solid

 

 

 

 

1600

 

 

 

 

 

 

2000

 

 

 

 

 

 

2600

 

 

 

 

 

 

3000

 

 

 

 

 

 

 

 

 

 

 

 

 

neutral connections

power connections

Transfer

Switch

power connections

neutral connections

Voltage

C 208

L 440

D 220

M 460

E 230

N 480

F 240

P 550

H 380

Q 575

J 400

R 600

K 415

 

 

 

Controller

1 – standard

1X – if accessories ordered

Enclosure

C – type 1

F – type 3R

G – type 4 *

L – type 12 *

blank – open type

* type 4 & 12 enclosures are available only for 1000, 1200, & 1600 amp. sizes

terminal block TB for engine start and switch position contacts

Controller

membrane controls

2000 amp. size in typical enclosure with location of customer connections

SECTION 1 INSTALLATION

ASCO Series 300 Automatic Transfer Switches (ATSs) are Listed under Underwriters Laboratories UL 1008 Standard for Safety for Automatic Transfer Switches. All control features are UL Component Recognized, which assures that ASCO automatic transfer switches meet OSHA Safety Requirements and will be acceptable to electrical inspectors.

ASCO Series 300 Automatic Transfer Switches are suitable for emergency and standby system applications. They meet emergency system rating requirements as defined in National Electrical Code (NEC) Article 700 and UL 1008. Also, they are suitable for the requirements of NEC Article 517 – Health Care Facilities, NEC Article 701 – Legally Required Standby Systems, NEC Article 702 – Optional Standby Systems, NFPA 99 Health Care Facilities, and NFPA 110 Emergency and Standby Power Systems.

Rating Label

Each automatic transfer switch contains a rating label to define the loads and fault circuit withstand / closing ratings. Refer to the label on the transfer switch for specific values.

!

Do not exceed the values on the rating label. Exceeding the rating can cause personal injury or serious equipment damage.

Series 300 Automatic Transfer Switches are factory wired and tested. Installation requires skid removal then securing the enclosure to the supporting foundation.

Remove the Shipping Skid

Open the front door and remove the four lag screws (two in front, two in rear) securing the enclosure to the wood skid.

Supporting Foundation

The supporting foundation for the enclosure must be level and straight. Refer to the applicable enclosure outline drawing included with the Series 300 for all mounting details including door opening space.

If bottom cable entry is used, the foundation must be prepared so that the conduit stubs are located correctly. Refer to the enclosure outline drawing for specified area and location. Provide cable bending space and clearance to live metal parts. When a concrete floor is poured, use interlocking conduit spacer caps or a wood or metal template to maintain proper conduit alignment.

Mounting

Refer to the applicable enclosure outline drawing furnished with this switch and mount the Series 300 according to details and instructions shown on diagram.

1--1

Auxiliary Cable Box for 1000–2000amp

An auxiliary cable box is required if the power cables do not enter the enclosure directly adjacent to the terminal lugs (for example, if all power cables enter the top or bottom). Order ASCO part no. 609027 if needed.

!

Do not route the power cables along the sides of the Transfer Switch.

Line Connections

Refer to the Wiring Diagram provided with your Series 300 ATS. All wiring must be made in accordance with the National Electrical Code and local codes.

It is unnecessary to remove pole covers from the transfer switch. If you do remove them, reinstall them carefully.

De–energizethe conductors before making any line or auxiliary circuitry connections. Be sure that Normal and Emergency line connections are in proper phase rotation. Place engine generator starting control in the OFF position. Make sure engine generator is not in operation.

Testing Power Conductors

Do not connect the power conductors to the ASCO Series 300 transfer switch until they are tested. Installing power cables in conduit, cable troughs and ceiling-suspendedhangers often requires considerable force. The pulling of cables can damage insulation and stretch or break the conductor’s strands. For this reason, after the cables are pulled into position, andbefore they are connected, they should be tested to verify that they are not defective or have been damaged during installation.

!

Protect the automatic transfer switch from construction grit and metal chips to prevent malfunction or shortened life of the ATS.

Connecting Power Conductors

After the power cables have been tested, connect them to the appropriate terminal lugs on the transfer switch as shown on the wiring diagram provided with this Series 300. Make sure the lugs provided are suitable for use with the cables being installed. Standard terminal lugs are solderless screw type and will accept the wire sizes listed on the drawings provided with the Series 300. Be careful when stripping insulation from the cables; avoid nicking or ringing the conductor. Remove surface oxides from cables by cleaning with a wire brush. When aluminum cable is used, apply joint compound to conductors. Tighten cable lugs to the torque specified on rating label.

INSTALLATION

(continued)

Controller Ground

Harnesses

A grounding wire must be connected to the controller’s lower left mounting stud. Because the controller is mounted on the enclosure door, a conductive strap must be used between the enclosure and the door. This connection provides proper grounding which does not rely upon the door hinges.

Engine Starting Contacts

Customer connections for engine control contact and TS auxiliary contacts connections are located on terminal block TB which is mounted on the front lower left of the transfer switch. Refer to wiring diagram provided with the Series 300 ATS and connect the engine start wires to the appropriate terminals. See Figure 1–1and Table A.

Table A. Engine start connections.

When normal

Terminals on

source fails

transfer switch

contact closes

TB1 and TB3

contact opens

TB1 and TB2

Auxiliary Circuits

Connect auxiliary circuit wires to appropriate terminals on transfer switch terminal block TB as shown on the wiring diagram provided with this Series 300 Automatic Transfer Switch. Make the necessary auxiliary connections by referring to Section 5, Control Features.

The transfer switch is connected to the left side of the controller by a plug–inharness (two plugs).

Engine Starting

TS Auxiliary Contacts

 

Signals

Feature 14A & 14B

 

5 amps, 32 V DC

10 amps, 32 V DC

 

5 amps resistive 28 V DC

10 amps 250 V AC

TB Terminal Block

or 120 V AC max.

general purpose

 

 

(field connections)

 

 

accepts wire range

 

 

22–12AWG

Figure 1-1.Connections to engine starting contact terminal block located on the Transfer Switch.

Connections to Controller

for other Control Features

(located on bottom of Controller)

Load Disconnect

Programmable

Feature

Engine Exerciser

Connections

connection,

(see Wiring Diagram

if provided

& refer to page 5–3

(refer to

for DIP switch settings) page 5–2)

Remote Control Features Connections

 

(refer to the Wiring Diagram &

 

page 5–3for DIP switch settings)

 

Each control contact must be suitable

for factory

for a 5 V DC low energy circuit.

use only

Figure 1-2.Input / output label on the Controller showing possible connections to the lower terminal block.

1--2

INSTALLATION (continued)

Functional Test

The Functional Test consists of three checks: manual operation, voltage checks, and electrical operation.

!

Do these checks in the order presented to avoid damaging the automatic transfer switch.

Read all instructions on the Wiring Diagram and labels affixed to the automatic transfer switch. Note the control features that are provided and review their operation before proceeding.

1 – Manual Operation Test

A detachable maintenance handle is provided on the frame of the Transfer Switch for maintenance purposes only. Manual operation of the transfer switch should be checked before it is energized (operated electrically).

Turn counterclockwise to Emergency.

Turn clockwise

 

Grasp

 

handle

to Normal.

 

insert

firmly

 

 

 

slide hub

handle

 

onto shaft

into hole

 

Figure 1-3.Maintenance handle.

1.After deenergizing both power sources, open the enclosure door. Locate and remove the maintenance handle and hub stored on the transfer switch frame. Then install the hub onto the center operator shaft and insert the handle firmly into the hole in the side of the hub (spring fully compressed). See Figure 1–3and1–4and Table B.

!

 

 

 

2.

If the transfer switch is closed on Normal (window shows

 

 

 

 

 

 

 

 

 

 

 

 

 

CLOSED), grasp handle firmly and turn it counterclock-

Do not manually operate the transfer switch

 

 

until both power sources are disconnected:

 

 

wise. The transfer switch should operate smoothly

open both circuit breakers.

 

 

without binding. If it does not, check for shipping

 

 

 

 

 

 

 

damage or construction debris.

Table B. Maintenance handle positions.

3.

Turn the handle clockwise to return the transfer switch to

 

 

 

 

 

ATS Position

 

Indicators

 

 

the Normal position. Observe that the window indicators

 

E

 

 

OPEN

 

 

(left side) show the top shaft OPEN and the bottom shaft

 

 

 

 

 

CLOSED.

Normal

 

upper contacts open

 

 

 

 

 

 

 

 

 

 

 

 

CLOSED

 

 

Note: If Normal and Emergency connections are

 

 

 

 

 

 

 

N

lower contacts closed

 

 

reversed this operation is also reversed.

 

 

 

 

 

4.

Remove the maintenance handle and hub and store it on

 

E

 

 

CLOSED

 

 

 

 

 

the frame in the place provided.

Emergency

 

upper contacts closed

 

 

 

 

 

 

 

 

 

!

 

 

 

N

 

 

OPEN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

lower contacts open

 

 

Verify that the maintenance handle and hub

 

 

 

 

 

 

 

 

have been removed before proceeding!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Now continue to 2 – Voltage Checks on next page.

Emergency contacts

window indicators

OPEN or

CLOSED

Normal

counterclockwise DOWN

clockwise DOWN closes

closes the Emergency

the Normal source contacts

contacts

source contacts (upper)

(lower) and opens the

contact position

and opens the Normal

Emergency source

indicators (left side)

source contacts (lower)

contacts (upper)

Figure 1-4.Contact position indicators and maintenance handle operation.

1--3

INSTALLATION (continued)

Florham Park NJ 07932 USA

observe these lights

TRANSFER SWITCH TEST

BYPASS TIME DELAY SET ENGINE EXERCISER

Press for 15 Seconds

Press until light FLASHES

Figure 1–5.Standard controls and indicators.

2 – Voltage Checks

First check nameplate on transfer switch; rated voltage must be the same as normal and emergency line voltages.

!

Verify that the feeders have been connected to the proper lugs.

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 !

Perform steps 1 through 6 at the right. Observe the status lights. See Figure 1–5.

Black circle means light is on.

White circle means light is off.

*If necessary, adjust voltage regulator on the generator according to the manufacturer’s recommendations. The Automatic Transfer Switch will respond only to the rated voltage specified on the Transfer Switch nameplate.

Close the normal source circuit breaker. The Transfer Switch

1Connected To Normal and the Normal Source Availablelights should come on.

Use an accurate voltmeter to check phase to phase and

2phase to neutral voltages present at the transfer switch normal source terminals.

Close the emergency source circuit breaker. (Start generator,

3if necessary.) The Transfer Switch Connected To Normal

and the Emergency Source Availablelights should come on.

Use an accurate voltmeter to check phase to phase and

4phase to neutral voltages present at the transfer switch emergency source terminals.*

A B C

Use a phase rotation meter to 5 check phase rotation of emer-

gency source; it must be the same as the normal source.

Shut down the engine–genera-tor, if applicable. TheEmergency Source Accepted light should

6go off. Then put the starting

control selector switch (on the generator set) in the automatic position. Close enclosure door.

Now continue to 3 – Electrical Operation on next page.

1--4

INSTALLATION (continued)

Florham Park NJ 07932 USA

observe these lights

press this button

TRANSFER SWITCH TEST BYPASS TIME DELAY SET ENGINE EXERCISER

Press for 15 Seconds

Press until light FLASHES

Figure 1–6.Standard controls and indicators.

3 – Electrical Operation

First check nameplate on transfer switch; rated voltage must be the same as normal and emergency line voltages.

!

Verify that the feeders have been connected to the proper lugs.

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 !

Perform steps 1 through 8 at the right. Observe the status lights. See Figure 1–6.

Black circle means light is on.White circle means light is off.

NOTE: If Motor Load Transfer feature is activated, then transfer may not occur immediately after the respective time delays. Transfer will only occur when the phase relationship between sources is correct.

This completes the Functional Test of the ASCO Series 300 Automatic Transfer Switch. Leave the engine–generatorstarting control in theautomatic position.

The normal source must be

 

available and the generator

 

1 must be ready to start.

 

Check that the Normal Source

 

Available light is on.

 

Press and hold theTransfer

TRANSFER SWITCH TEST

2Switch Test button until the engine starts and runs. This should happen within 15 sec.

3The Emergency Source Availablelight should come on.

 

The transfer switch should

 

 

transfer to the Emergency

 

4

position. The Load Connected

 

to Emergency light should come

 

 

on and the Load Connected to

 

 

Normal light should go off.

 

 

 

 

 

If the transfer to emergency

 

 

delay is used the transfer

BYPASS TIME DELAY

5should occurs after a time delay (up to 5 minutes).

For immediate transfer press the Bypass Time Delay button.

The transfer switch should transfer back to the Normal

6position. The Load Connected to Normallight should come on

and the Load Connected to Emergencylight should go off.

If the retransfer to normal delay

 

is used the retransfer should

BYPASS TIME DELAY

7occur after a time delay (up to 30 minutes).

For immediate retransfer press the Bypass Time Delay button.

The unloaded running delaykeeps the generator running for

85 minutes (cool–downperiod). Then the generator should stop

and the Emergency Source Availablelight should go off.

1--5

to emergency.
generator and to (stops engine now or period immediately (engine transfer the load after cooldown) See starts) and weekly thereafter.
start the engine
Hold 15 sec. to
active exercise period 20 min. engine exercise
Press until light FLASHES
Hold 5 sec. to set
Florham Park NJ 07932 USA
TRANSFER SWITCH TEST BYPASS TIME DELAY SET ENGINE EXERCISER
page 5–1.
Press to cancel the
Press for 15 Seconds

SECTION 2 SEQUENCE OF OPERATION

lights show position of transfer switch

lights show the sources available

Transfer To Emergency

The sequence for load transfer to emergency source begins automatically when normal source voltage falls below the preset dropout point or when Transfer Switch Test button is pressed. An under voltage condition on any phase of the normal source is detected by the sensor.

When the normal source voltage fails or the Transfer Switch Test button is pressed, the SE relayde-energizesand relay NR begins its timing cycle (1 or 3 seconds,momentary normal source outage

delay). The NR relay is provided with a time delay on dropout to override momentary outages and prevent nuisance starting of theengine-drivengenerator. If the normal source voltage returns above the sensor dropout setting before the time delay expires, the NR relay timing cycle is reset to zero and relay SE energizes.

If the normal source voltage does not return above the sensor dropout setting before the time delay expires, the NR relay de-energizesand signals theengine-drivengenerator to start. At the same time, a voltage and frequency sensor begins monitoring the emergency source. The sensor will accept the emergency source only whenboth voltage and frequency reach preset pickup points. Usually about ten seconds elapse from dropout of the NR relay to acceptance by the sensor. This time span occurs because theengine-drivengenerator must crank, start, and run up to nominal pickup points. For this reason, if theTransfer Switch Test button is pressed it must be held for 15 seconds. If the emergency source is available immediately, the sensor may accept it as soon as NR relay drops out.

When the emergency source is accepted by the sensor, relay ER begins its timing cycle (transfer to emergency delay). ER relay is provided with an adjustable (0 to 5 minutes) time delay on pickup to delay transfer of the load to the emergency source. For immediate transfer pressBypass Time Delay button.

ER relay energizes, the TS coil is energized, the transfer switch operates, and all switch contacts (mains, controls, auxiliaries) reverse position. The transfer switch is now supplying the load from the emergency source.

The transfer switch will remain in the Emergency position until the normal source is restored. If the Transfer Switch Terst button is used, the transfer switch will remain on emergency until theretransfer to normal delay times out.

light for built–inengine exercise timer

· blinks rapidly when button is held 5 sec. while being set

· blinks slowly when button is released (set) and during 20 min. exercise period.

· stays on after engine stops (exerciser is enabled for weekly operation)

See page 5–1for complete instructions

Figure 2–1.Membrane controls and indicator lights.

Retransfer to Normal

The sequence for load retransfer to the normal source automatically begins when the voltage sensor detects restoration of the normal source. The voltage level must rise above the preset pickup point on all phases before the sensor will accept the normal source.

When the normal source is accepted by the sensor, relay SE begins its timing cycle (adjustable 1 sec. to 30 min., retransfer to normal delay). For immediate retransfer pressBypass Time Delay button. SE relay is provided with a time delay on pickup to prevent immediate load retransfer to the normal source. The delay insures that the normal source has stabilized before reconnection of vital loads. If the normal source voltage falls below the present dropout point before the time delay expires, the timing cycle is reset to zero. If the emergency source fails for more than 4 seconds during the timing cycle, ER relay drops out and the load is immediately retransferred to the normal source, if that source is acceptable.

SE relay energizes and ER relay is dropped out. The TS coil is energized, the transfer switch operates, and all switch contacts (mains, controls, auxiliaries) reverse position. The transfer switch is now supplying the load from the normal source again.

Upon retransfer to the normal source, NR relay begins its timing cycle (unloaded running delay [engine cooldown] ). NR relay is provided with a 5 minute time delay on pickup to keep the engine running for acool-downperiod.

NR relay energizes after the time delay and signals the engine-drivengenerator to shut down. All circuits are reset for any future normal source failure.

Activation of standard control features shown in Section 5 will alter the sequence of operation and introduce additional time delays during transfer operations.

2--1

SECTION 3 TESTING & SERVICE

PREVENTIVE MAINTENANCE DISCONNECTING THE CONTROLLER

Reasonable care in preventive maintenance will insure high reliability and long life for the automatic transfer switch.

Operate the switch at least once a month. Perform this four step Electrical Operation Test. This is a test with load transfer.

TRANSFER SWITCH TEST

BYPASS TIME DELAY SET ENGINE EXERCISER

Press for 15 Seconds

Press until light FLASHES

 

 

Transfer Switch Test

1.Press and hold the door-mountedTRANSFER SWITCH TEST button until the engine starts and runs. This should happen within 15 seconds.

2.The transfer switch will operate to the Emergency position. If the Transfer To Emergency Delay is used, the transfer will occur after a time delay

(up to 5 minutes). For immediate transfer press

BYPASS TIME DELAY button.

3.The Transfer Switch will operate back to the Normal position after the Retransfer To Normal Delay (up to 30 minutes). For immediate retransfer pressBYPASS TIME DELAY button.

4.Unloaded Running (Engine Cooldown) Delay allows engine to run unloaded for 5 minutes.

Clean and inspect the switch once a year. De-energize all sources, then brush and vacuum away any excessive dust accumulation. Remove the transfer switch barriers and check contact condition. Replace contacts when pitted or worn excessively. Reinstall the barriers carefully.

Maintain transfer switch lubrication. The transfer switch has been properly lubricated, and under normal operating conditions no further lubricating is required. Renew factory lubrication if the switch is subjected to severe dust or abnormal operating conditions. Relubricate the operator if TS coil is replaced. Order lubrication kit 75-100.

Replacement parts. Replacement parts are available in kit form. When ordering parts provide the Serial No. and Catalog No. from the transfer switch nameplate. Contact your local ASCO Power Technologies sales office.

3--1

The harness disconnect plugs are furnished for repair purposes only and should not have to be unplugged. If the controller must be isolated, follow these steps carefully.

Disconnecting the Plugs

!

Do not unplug the controller until step 1a. or 1b. below is completed.

1.Observe the position of the transfer switch.

a.If the transfer switch is in the Normal position, place standby engine starting control in theoff position. Then open the emergency source circuit breaker.

b.If the transfer switch is in the Emergency position, open the normal source circuit breaker. Place the engine starting control in thetest orrun position.

2.Separate the quick disconnect plugs by squeezing the latches. Do not pull on the harness wires.

3.Label, remove, and tape the signal wires connected to the engine start terminals on the transfer switch: TB1 and TB3, or TB1 and TB2.

Reconnecting the Plugs

!

Do not reconnect the controller until step 1a. or 1b. and 2 below are completed.

1.Observe the position of the transfer switch.

a.If the transfer switch is in the Normal position, be sure that the standby engine starting control is still in theoff position. The emergency source circuit breaker still should be open.

b.If the transfer switch is in the Emergency position, normal source circuit breaker still should be open.

2.Reconnect the signal wires connected to the appropriate engine start terminals on the transfer switch. See Section 1,Engine Starting Contacts.

3.The harness plugs and sockets are keyed. Carefully align the plugs with the sockets and press straight in until both latches click.

4.Restore the opposite source as follows:

a.If the transfer switch is in the Normal position, place the standby engine starting control in theautomatic position. Then close the emergency source circuit breaker.

b.If the transfer switch is in the Emergency position, close the normal source circuit breaker. The load will be automatically retransferred to the normal source after theRetransfer to Normal Delay. For immediate retransfer, pressBYPASS TIME DELAY button. Place the engine starting control in theautomatic position.

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-Setdoes 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-setstarts.

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-Setdoes 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-Shootingthe 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 !

1.Connect a voltmeter (set for twice system phase–to–phasevoltage) 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 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

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.

3--2