Emerson 7400 Power Supply User Manual

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Emerson 7400 Power Supply User Manual | Manualzz

Operator’s

Manual

7000 Series 7ADTB

Automatic Delayed–Transition Transfer

& Bypass–Isolation Switches

J design 150 through 600 amp.

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

Refer to the outline and wiring drawings provided with your 7000 Series ADTB for all installation and connection details and accessories.

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

Refer to Group 5 Controller User’s Guide 381333–126 for ATS status display messages, time delays, pickup

& dropout settings, and adjustments.

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

An experienced licensed electrician must install the

7ADTB.

Rating Label

Each 7000 Series 7ADTB contains a rating label to define the load 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.

TABLE OF CONTENTS

section-page

INSTALLATION

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Connections . . . . . . . . . . . . . . . . . . . .

1-1

1-1

Engine Starting & Auxiliary Circuits

Functional Test . . . . . . . . . . . . . . . . .

. . . . . .

1-2

1-2, 1-3, 1-4

TESTING & SERVICE

Transfer Test . . . . . . . . . . . . . . . . . . . . . . . . . .

Preventive Maintenance . . . . . . . . . . . . . . . .

Disconnecting the Controller . . . . . . . . . . . .

Manual Load Transfer

Trouble-Shooting

. . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . .

2-1

2-1

2-1

2-2

2-2

BYPASSING & ISOLATING

Bypassing the ATS

Isolating the ATS

. . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . .

Return to Service . . . . . . . . . . . . . . .

3-1, 3-2

3-3, 3-4

3-5, 3-6, 3-7

INDEX . . . . . . . . . . . . . . . . . . . . . . . . .

back cover

50 Hanover Road, Florham Park, New Jersey 07932–1591 USA

For sales or service call 1 800 800–2726 (ASCO) www.ascopower.com

ASCO POWER TECHNOLOGIES CANADA PO Box 1238, 17 Airport Road, Brantford, Ontario, Canada N3T 5T3 telephone 519 758–8450, fax 519 758–0876, for service call 1 888 234–2726 (ASCO) www.asco.ca

381333–309

Nameplate

The Transfer Switch nameplate includes data for each specific 7000 Series ADTB. Use the switch only within the limits shown on this nameplate. A typical Catalog Number is shown below with its elements explained.

J7ADTB C 3 600

Catalog Number Identification

Typical 7000 Series ADTB catalog no. for overlapping neutral, 3 pole, 600 amp, 480 V, ATS in Type 1 enclosure:

N 5 C

Neutral

A

– solid

B

– switched blank – none

Phase Poles

2

– single Ø

3

– three Ø

Amperes

150

260

400

600

Voltage

A

115

B

120

C

208

D

220

E

230

F

240

G

277

H

380

J

400

K

415

L

440

M

460

N

480

P

550

Q

575

R

600

Controller

5

– standard

5X

– if accessories ordered

Enclosure

C

– type 1

F

– type 3R

G

– type 4

L

– type 12 blank – open type optional

Accessory

Transfer/Bypass

Status Panel

Bypass

Handle

Isolation

Handle

Transfer

Switch

(inside)

Standard

Controls

& Indicators

Group 5

Controller

SECTION 1 INSTALLATION

ASCO 7000 Series Automatic Delayed–Transition

Transfer & Bypass–Isolation Switches (7ADTBs) are factory wired and tested. Field installation requires mounting and connection of service cables, and auxiliary control circuits (if required).

Remove the Shipping Skid

Open the front door and remove the four lag screws (2 in front, 2 in rear) securing enclosure to the shipping skid.

Testing Power Conductors

Do not connect the power conductors to the transfer switch until they are tested. Installing power cables in conduit, cable troughs and ceiling-suspended hangers 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, and before they are connected, they should be tested to verify that they are not defective or have been damaged during installation.

Supporting Foundation

The supporting foundation for the enclosure must be level and straight. Refer to the applicable enclosure outline drawing included with the switch 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.

Protect the switch from construction grit and metal chips to prevent malfunction or shortened life of the 7ADTB switch.

Connecting Power Conductors

After the power cables have been tested, connect them to the appropriate terminal lugs on the bypass switch as shown on the wiring diagram provided with the switch.

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 7ADTB. 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.

Mounting

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

Line Connections

Refer to the Wiring Diagram provided with the switch.

All wiring must be made in accordance with the National

Electrical Code and local codes.

Do not remove the interphase barriers from the transfer switch. Always protect the transfer switch, bypass switch, and isolation contacts and mechanisms from construction grit and metal chips when cabling.

Controller Ground

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.

Harnesses

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

De–energize the 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.

1---1

INSTALLATION

(continued)

Engine Starting Contacts

All customer connections, including the engine control contact connections, are located on terminal block TB which is mounted on the top right side of the enclosure.

Refer to the wiring diagram provided with the automatic transfer switch and connect the engine start wires to the appropriate terminals. See Figure 1–1 and Table A.

Table A. Engine start connections.

When normal source fails

contact closes contact opens

Terminals on

Terminal Block TB

TB1 and TB2

TB1 and TB3

Note:

To temporarily disable engine control from the automatic transfer switch you can unplug J3 from the small P3 receptacle at the bottom of the assembly. Be sure to reconnect plug J3 to the P3 receptacle for automatic transfer switch operation.

Auxiliary Circuits

Connect auxiliary circuit wires to appropriate terminals on transfer switch terminal block TB as shown on the wiring diagram provided with this automatic transfer switch.

engine start connections on customer terminal block TB

Figure 1-1. Customer terminal block on the top right side of the enclosure.

The Functional Test consists of two checks:

❐ 1 — Voltage Checks, page 1–3

❐ 2 — Electrical Operation, page 1–4

Functional Test

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

Continue to 1 – Voltage Checks on next page.

Do these checks in the order presented to avoid damaging the 7ADTB.

1---2

INSTALLATION

(continued)

GREEN

RED observe these lights

GREEN

RED

AMBER

Figure 1-2. Standard controls and indicators.

Functional Test

Read all instructions on the Wiring Diagrams and labels affixed to the 7ADTB. Note the control features that are provided and review their operation before proceeding.

After installing the 7ADTB check the following:

– Bypass Handle should be in the NORMAL position.

– Isolation Handle should be in the CONN position.

– CN transfer switch should be C (closed)

– CE transfer switch should be O (open)

If handles are not in correct positions, follow instructions for Bypassing and Isolating the automatic transfer switch in Section 3. Do not force the handles. Electrical interlocks prevent a wrong sequence of operation.

1 – Voltage Checks

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

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

Perform steps 1–6 at the right. Observe the status lights.

See Figure 1–2.

Black square means light is on.

White square means light is off.

* If necessary, adjust voltage regulator on generator per the manufacturer’s recommendations. The 7ADTB will respond only to rated voltage specified on the nameplate.

Now continue to 2 – Electrical Operation on next page.

1---3

1

Close the normal source circuit breaker. The Transfer Switch

Connected To Normal and the

Normal Source Accepted lights should come on.

2

3

4

Use an accurate voltmeter to check phase to phase and phase to neutral voltages present at the transfer switch normal source terminals.

Close the emergency source circuit breaker. (Start generator, if necessary.) The Transfer

Switch Connected To Normal &

Emergency Source Accepted

lights should come on.

Use an accurate voltmeter to check phase to phase and phase to neutral voltages present at the transfer switch emergency source terminals.*

5

Use a phase rotation meter to check phase rotation of emergency source; it must be the same as the normal source.

6

Shut down the engine–generator, if applicable. The Emergen-

cy Source Accepted light should go off. Then put the starting control selector switch (on the generator set) in the automatic position. Close enclosure door.

A B C

Load

Disconnect

Active

Load

Disconnect

Active

Load

Disconnect

Active

INSTALLATION

(continued)

GREEN

RED operate this switch observe these lights

GREEN

RED

AMBER

Figure 1-3. Standard controls and indicators.

2 – Electrical Operation

This procedure checks electrical operation of the ADTS.

Close enclosure door before proceeding to prevent personal injury in case of electrical system fault.

Transfer Test

The ATS should still be bypassed. Both normal and emergency sources must be available and the emergency source generator (if used) must be capable of being started; put engine starting control in automatic position.

The Transfer Switch Connected to Normal light and the

Normal Source Accepted light should be on.

1. Turn the Isolation Handle counterclockwise to the

TEST position.

NOTE:

The engine generator may be signalled to start while turning the Isolation Handle. If emergency source is available, the ATS may operate to the emergency position. If it does, operate Retransfer Delay Bypass switch.

2. Perform steps 1–5 at right. Observe the status lights.

See Figure 1–3.

Black square means light is on.

White square means light is off.

3. Turn the Isolation Handle clockwise to the CONN

(connected) position.

4. Turn Bypass Handle clockwise to the OPEN position.

This completes the Functional Test of the 7ADTB.

1

Turn and hold Transfer Control switch clockwise to Transfer

Test until the engine starts and runs (within 15 sec.). The

Emergency Source Accepted

light should come on.

2

3

4

Transfer switch CN opens and the Transfer Switch Connected

to Normal light should go off and the Load Disconnect Active light should come on. Both CN

& CE contacts are now open.

After the delay transition time delay, the CE Transfer switch will operate to the Emergency position. The Transfer Switch

Connected To Emergency light should come on and Load Dis-

connect Active light goes off.

Transfer switch will operate back to Normal position after

Feature 3A time delay. For immediate retransfer turn Transfer

Control counterclockwise to

Retransfer Delay Bypass. The

Transfer Switch Connected To

Normal light should come on;

Transfer Switch Connected to

Emergency light should go off.

5

The engine–generator will stop after the Feature 2E time delay

(unloaded running engine cooldown). The Emergency Source

Accepted light should go off.

1---4

Load

Disconnect

Active

Load

Disconnect

Active

Load

Disconnect

Active

Load

Disconnect

Active

Load

Disconnect

Active

SECTION 2 TESTING & SERVICE

TRANSFER TEST

Test the Automatic Transfer Switch portion of the 7000

Series 7ADTB at least once a month. This procedure checks the electrical operation of the Transfer Switch and

Controller. Put the engine–generator starting control (at the engine–generator set) in automatic mode.

In the following test the generator will start, the load will be transferred to the Emergency source, then back to the

Normal source. An interruption to the load will occur, unless the the Transfer Switch contacts are bypassed before the test. See pages 3–1 through 3–4 for bypassing & isolating instructions if no interruption of load is required.

REPLACEMENT PARTS

Replacement parts are available in kit form. When ordering parts provide the Serial No., Bill of Material No.

(BOM), and Catalog No. from the transfer switch nameplate. Contact your local ASCO Power Technologies

Sales Office or ASI:

In the United States

call 1 – 800 – 800 – ASCO ( 2726 )

In Canada

call 1 – 888 – 234 – ASCO ( 2726 )

Be sure to close the enclosure door before proceeding to prevent personal injury in case of electrical system fault.

Perform the five–step Electrical Operation – Transfer

Test

procedure on page 1–4.

DISCONNECTING THE CONTROLLER

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:

Bypass–Isolation Switch is energized!

Do not touch isolation contact fingers; shock, burns, or death could result!

PREVENTIVE MAINTENANCE

Reasonable care in preventive maintenance will insure high reliability and long life for the 7000 Series 7ADTB.

An annual preventive maintenance program is recommended.

ASCO Services, Inc. (ASI) is ASCO Power

Technologies’s national service organization. In the

US ASI can be contacted at 1-800-800-2726 for information on preventive maintenance agreements.

Disconnecting the Plugs

1. Bypass and Isolate the Automatic Transfer Switch.

2. Open the upper enclosure door.

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

Checklist for Yearly Inspection

Reconnecting the Plugs

1. The ATS should be still bypassed and isolated.

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

3. Close the enclosure doors.

4. Follow Return to Service instructions on page 3–5.

Hazardous voltage capable of causing shock, burns, or death is used in this switch.

Deenergize both Normal – Emergency power sources before performing inspections!

Clean the 7ADTB enclosure.

Brush and vacuum away any excessive dust accumulation. Remove any moisture with a clean cloth.

Check the transfer switch contacts.

Bypass, isolate, and withdraw the transfer switch.

Then remove the transfer switch interphase barriers and check the condition of the contacts. Replace contacts when pitted or worn excessively. Reinstall the interphase barriers carefully. See page 3–4.

Maintain transfer switch lubrication.

If switch is subjected to severe dust or abnormal operating conditions, renew factory lubrication on all movements and linkages. Relubricate solenoid operator if TS coil is replaced. Don’t use oil; order

lubrication kit 75-100.

Check all cable connections & retighten them.

MANUAL LOAD TRANSFER

This procedure manually transfers load to other source if the Transfer Switch or Controller are out of service.

Close enclosure doors to prevent personal injury in case of electrical system fault.

1. Bypass the connected ACTB source. Turn Bypass Handle to EMERGENCY or NORMAL (see page 3–2).

2. Isolate to Test. Turn the Isolation Handle to TEST position (see page 3–3).

3. Turn the Bypass Handle to OPEN, then to the other source (see page 3–1). The load will be interrupted.

4. Turn the Isolation Handle clockwise to the CONN

[connected] position (see page 3–4).

2--1

TESTING & SERVICE

(continued)

TROUBLE-SHOOTING

Note any optional accessories that may be furnished on the 7ADTB and review their operation. Refer to any separate drawings and/or instructions that may be packed with the 7ADTB. See Table B.

Hazardous voltage capable of causing shock, burns, or death is used in this switch.

Do not touch the power or load terminals of the bypass switch or transfer switch!

Engine–generator set does not start when the Transfer

Control switch is turned and held in Transfer Test position or when normal source fails.

Transfer switch does not transfer the load to the emergency source after the engine–generator set starts.

Transfer switch does not transfer the load to normal source when normal returns or when the Transfer Control switch is released.

Gen. does not stop after load retransfer to normal source.

Load Disconnect Active light comes on.

Load Disconnect Active light stays on longer than 6 min.

Table B. Trouble-Shooting Checks.

CHECK IN NUMERICAL SEQUENCE

1 OPERATION

Hold Transfer Test switch 15 seconds or the outage must be long enough to allow for

Feature 1C time delay plus engine cranking and starting.

2 GEN-SET

Starting control must be in the automatic position. Batteries must be charged and connected. Check wiring to engine starting contacts.

Wait 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.) *

3 VOLTAGE

---

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)*

Wait for Feature 3A time delay to time out.

Wait for Feature 2E time delay to time out.

Wait for load disconnect time delay to time out.

Check load disconnect time delay setting. Call ASI.

---

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).

Starting control must be in the automatic position.

---

Explanation: Transfer switch in delayed transition transfer mode.

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

Explanation: Transfer switch contacts are open longer than 5 min. 59 sec (maximum setting). Load remains disconnected.

* These are factory settings. Refer to Controller’s 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: in the United States, call 1–800–800–2726 or in Canada call 1–888–234–2726. Furnish the Serial No.,

Catalog No., and Bill of Material (BOM) No. from the transfer switch nameplate.

MAINTENANCE HANDLE

Bypass and isolate the Transfer Switch before using the maintenance handle! See pages

3–1 through 3–4. Remove the maintenance handle after using it; store it inside.

1. Bypass, isolate, and withdraw the transfer switch

(pages 3–1 through 3–4). Then locate and remove the maintenance handle from the clip (inside lower left side). Insert the handle onto the shaft on the left side of the operator of the transfer switch See Figures

2–1, 2–2, 2–3 and Table C.

2. Move the maintenance handle up or down as shown to manually operate the transfer switch. Operate both upper and lower contact shafts. Observe the window indicators (right side). Remove the maintenance handle and store it on the lower left side.

Emergency contacts

(upper shaft) window indicators

O is open

C is closed

contact position indicators

(right side)

Normal contacts

(lower shaft)

Figure 2–1. Contact position indicators.

2--2

TESTING & SERVICE

(continued)

handle frame

UP opens the

Emergency source contacts

UPPER SHAFT

DOWN closes the

Emergency source contacts shaft extension

Figure 2–2. Maintenance handle operation for Emergency source contacts (upper shaft).

handle frame

UP closes the

Normal source contacts

LOWER SHAFT

DOWN opens the

Normal source contacts shaft externsion

Figure 2–3. Maintenance handle operation for Normal source contacts (lower shaft).

Table C. Maintenance handle positions.

ALL POWER MUST BE OFF !

Transfer Switch Position Interlocked Shafts Maintenance Handle

shaft extension up

Shaft Indicators

E

E = O upper contacts open up

N shaft extension link N = C lower contacts closed up

Load

Disconnected

E

N

E = O upper contacts open

N = O lower contacts open down

E

E = C upper contacts closed down

N

N = O lower contacts open down

* Link between contact shafts prevents closing both N and E contacts. The shaft extension and contact shaft turn in opposite directions through a cam–follower mechanism. If Normal and Emergency connectios are reversed this operation is also reversed.

2--3

SECTION 3 BYPASSING & ISOLATING

BYPASSING THE ATS*

This procedure explains how to Bypass the closed transfer switch contacts. Bypassing is required before the

Transfer Switch can be tested or isolated. The Bypass

Switch Handle must be in the OPEN position (green window indicator) and the Isolation Handle must be in the CONN [connected] position (window indicator). The

TS Connected light must be on. See Figures 3–1, 3–2, 3–3.

You can only bypass to the same source that the Transfer Switch is connected.

Solenoid interlock prevents incorrect operation.

1. Observe which Transfer Switch Connected To light is on (Normal or Emergency) on the door. This is the position of the transfer switch (see Figure 3–2).

2. Follow the directions on next page to Bypass to the same source as connected to transfer switch (select

Normal or Emergency).

Window indicator shows yellow when ATS is bypassed to

Emergency.

Window indicator shows green when the ATS is not bypassed.

Figure 3–1. Status lights and Engine Control.

TRANSFER SWITCH

CONNECTED TO NORMAL

Upper green light is on if Transfer Switch is on

Normal.

Lower red light is on if

Transfer Switch is on

Emergency.

CONNECTED TO EMERGENCY

Figure 3–2. Status lights for Transfer Switch main contact position.

Upper amber light should be on.

TS CONNECTED

TS TEST

TS ISOLATED

Figure 3–3. Status lights for Transfer Switch isolation contact position.

Window indicator shows yellow when ATS is bypassed to

Normal.

Figure 3–4. Bypass Handle and three position window indicators.

NOTE: The 7ATB contains mechanical (window) indicators for the bypass switch and transfer switch positions in addition to the LED status lights.

Allowable Positions of the Bypass Switch in relation to Positions of the Transfer Switch

(with Isolation Handle in the Conn [connected] position and TS Connected light on)

Transfer Switch

Bypass Switch can be in either

If Transfer Switch is in

Normal position.

If Transfer Switch is in

Emergency position.

Open or Normal

Open or Emergency

3---1

BYPASSING & ISOLATING

(continued)

To Bypass Normal Source* To Bypass Emergency Source*

(Load connected to Normal Source)

The Transfer Switch Connected To Normal light is on and Transfer Switch Connected To Emergency light is off.

(Load connected to Emergency Source)

The Transfer Switch Connected To Emergency light is on and Transfer Switch Connected To Normal light is off.

Push in the handle and turn it counterclockwise.*

Turn the handle clockwise.*

Push in* the Bypass Handle all the way, then turn it counterclockwise until Bypass Switch Position shows closed on NORMAL (yellow window indicator). The green light Bypassed to Normal will come on and the amber light Not In Automatic will flash.

Push in

Bypass

Handle and turn it counterclockwise.

Bypass Switch

E

L

Turn* the Bypass Handle clockwise until Bypass Switch

Position shows closed on EMERGENCY (yellow window indicator). The red light Bypassed to Emergency will come on and the amber light Not In Automatic will flash.

Turn

Bypass

Handle clockwise.

Bypass Switch

E

L

N

ATS

Figure 3–5. Bypass to Normal diagram.

Upper green light comes on

BYPASS SWITCH

BYPASSED TO NORMAL

BYPASSED TO EMERGENCY

N

ATS

Figure 3–7. Bypass to Emergency diagram.

BYPASS SWITCH

BYPASSED TO NORMAL

Lower red light comes on

BYPASSED TO EMERGENCY

Upper window indicator

EMERGENCY shows yellow

Lower window indicator

NORMAL shows yellow

Figure 3–6. Status light and window indicator for

Bypassed to Normal Source.

Figure 3–8. Status light and window indicator for

Bypassed to Emergency Source.

The automatic transfer switch can now be put in the TEST or OPEN position. See ISOLATING on page 3–3.

* NOTE

: When Accessory 40*B (reversed Normal & Emergency connections) is specified, the handle operation is reversed. Follow instructions on the door.

3---2

BYPASSING & ISOLATING

(continued)

ISOLATING THE ATS

Isolating is required before any service work can be performed on the automatic transfer switch (ATS). Refer to Figures 3–9, 3–10, 3–11, and 3–12.

NOTE: In the TEST position the transfer switch solenoid operator circuit is energized through secondary disconnects.

1. Bypass the closed automatic transfer switch contacts.

See BYPASSING on pages 3–1 and 3–2.

2. Turn the Isolation Handle counterclockwise (approx.

8 turns) until window shows TEST. The TS Test amber light should come on. The ATS can be tested now without load interruption (see page 2–1).

Bypass Switch

E

Hazardous voltage capable of causing electrical shock, burns, or death; do not touch any control circuit terminals.

3. Continue turning Isolation Handle counterclockwise

(approx. 6 turns) until the window shows ISOLATE.

The TS Isolated amber light should come on.

Bypass Switch

E

Turn crank counterclockwise until window shows

TEST.

L

N

Automatic Transfer Switch

Figure 3–9. CONNECTED to TEST position.

Turn crank counterclockwise until window shows

ISOLATE.

L

Automatic Transfer Switch

Figure 3–11. TEST to ISOLATE position.

N

Middle amber light should be on.

TS CONNECTED

TS TEST

TS ISOLATED

Lower amber light should be on.

TS CONNECTED

TS TEST

TS ISOLATED

position window

CONN

TEST

counterclockwise – draws out the transfer switch

ISOLATE

Figure 3–10. Isolation Handle turned to TEST.

3---3 position window

CONN

TEST

ISOLATE

counterclockwise – draws out the transfer switch

Figure 3–12. Isolation Handle turned to ISOLATE.

BYPASSING & ISOLATING

(continued)

4. Open the lower enclosure door. Pull out both left and right side rails then use the two tab handles to roll out the transfer switch. It can be safely inspected in this position. The transfer switch can also be removed for easier maintenance operations. See Figure 3–13.

1. Deenergize transfer switch (pages 3–1 thru 3–4)

Bypass, isolate, and withdraw transfer switch.

Use a voltmeter to verify that no electrical power is present at the transfer switch terminals.

2. Use the maintenance handle (page 2–2).

Open the contacts that will be inspected by using the detachable maintenance handle.

Hazardous voltage capable of causing electrical shock, burns, or death; do not touch any control circuit terminals.

tab handles

3. Remove the barrier (Figure 3–14).

Use a phillip screwdriver to loosen (ccw) four or six captive round–head screws holding the barrier to the arc chutes. Then pull the barrier straight outward to remove it.

4. Reinstall the barrier.

Install the barrier over the arc chutes. Use a phillips screwdriver to tighten (cw) the four or six round–head screws to secure the barrier to the arc chute insulator nuts. See Figure 3–14.

left rail right rail

Figure 3–13.Transfer switch isolated and pulled out for inspection.

See page 2–2 for maintenance handle use. A lifting yoke

812053 is available to facilitate lifting by using an overhead crane or similar equipment. See WARNING.

The Transfer Switch weighs about 150 lbs.

depending upon the number of poles. Use lifting device 812053 or other device capable of lifting this weight to avoid personal injury or equipment damage. Two persons are recommended.

Contact Inspection

Contact condition should be checked annually.

Discoloration is normal. Do not file contacts because it wastes material. Instead use light emery paper to clean up the contact surfaces. The non–replaceable main contacts are designed to last the life of the transfer switch.

To prevent the possibility of fatal electrical shocks and burns, bypass, isolate, and withdraw the transfer switch before working on it.

3---4

Figure 3–14. Barrier removal.

BYPASSING & ISOLATING

(continued)

RETURN TO SERVICE

This procedure explains how to return the automatic transfer switch (ATS) to service after inspection and maintenance. Observe the Bypass Switch Position indicator and lights).

1. Use the two tab handles to roll the transfer switch into the enclosure (isolation contacts facing inward) until the crank bearings stop against the draw–in plates. Then push in both side rails and close the enclosure door.

Middle amber light should come on.

tab handles

TS CONNECTED

TS TEST

TS ISOLATED

Turn crank clockwise until window shows

TEST.

L

Automatic Transfer Switch

Figure 3–16. ISOLATE to TEST position.

N position window

TEST

clockwise – draws in the transfer switch

Figure 3–17. Isolation Handle turned to TEST.

3. The ATS can be tested now without load interruption

(see page 2–1).

left rail right rail

Figure 3–15.Transfer switch isolated and pulled out for inspection.

Close the enclosure door to prevent personal injury in case of electrical system fault.

2. Turn Isolation Handle clockwise (approx. 6 turns) until the window shows TEST and TS TEST light comes on.

Bypass Switch

E

3---5

Solenoid interlock prevents you from closing the isolation contacts until the ATS is in the same position as the Bypass Switch.

4. Observe which Bypass Switch Position window indicator is yellow (NORMAL or EMERGENCY) at the

Bypass Switch Handle. This indicates the source connected to the load.

5. Observe which Transfer Switch Connected To light is on (Normal or Emergency) on the door. This is the position of the Transfer Switch. If it is not in the same position as the Bypass Handle change the position of the Transfer Switch as follows:

To change the position of transfer switch

Operate to NORMAL Operate to EMERGENCY

Turn Transfer Control switch to Retransfer

Delay Bypass.

Turn Transfer Control switch to Transfer Test

(hold 15 seconds).*

Connected To Normal

light should come on.

Connected To Emergency

light should comes on.

* If Feature 2B time delay is used, there will be a delay before transfer to Emergency.

NOTE

: With Normal available, the automatic transfer switch will not stay in the emergency position unless

Feature 3A time delay is used (at least 30 seconds).

BYPASSING & ISOLATING

(continued)

Do not close the isolation contacts unless the Transfer Switch (ATS) and Bypass

Switch are in the same position!

6. When the transfer switch is in the same position as the Bypass Switch handle, continue turning the

Isolation Handle clockwise (about 8 turns) until the window shows CONN (connected).

Bypass Switch

E

Turn crank clockwise until window shows

TEST.

L

N

Automatic Transfer Switch

Figure 3–18. TEST to CONN (connected) position.

Upper amber light should be on.

TS CONNECTED

TS TEST

TS ISOLATED

position window

CONN

clockwise – draws in the transfer switch

Figure 3–19. Isolation Handle turned to CONN.

3---6

BYPASSING & ISOLATING

(continued)

RETURN TO SERVICE continued*

This procedure explains how to return the Bypass Switch

Handle to the OPEN position. The Bypass Handle must be in the CLOSED position (yellow indicator on NOR-

MAL or EMERGENCY) and the Isolation Handle must be in the CONN position (window). See Figures 3–20,

3–21, and 3–22.

Window indicator shows yellow when ATS is bypassed to

Emergency.

Window indicator shows green when the ATS is not bypassed.

You can only bypass to the same source that the ATS is connected. Solenoid interlock prevents incorrect operation.

1 Observe which Bypass Switch Position indicator is yellow (NORMAL or EMERGENCY) at the Bypass

Switch Handle. This indicates the source connected to the load.

2 Un–Bypass to same source as the Bypass Switch

Position as follows (select Normal or Emergency).

To Un–Bypass Normal Source*

(Load connected to Normal Source)

The Transfer Switch Connected To Normal light is on and Transfer Switch Connected To Emergency light is off.

Window indicator shows yellow when ATS is bypassed to

Normal.

Figure 3–20. Bypass Handle and position indicators.

To Un–Bypass Emergency Source*

(Load connected to Emergency Source)

The Transfer Switch Connected To Emergency light is on and Transfer Switch Connected To Normal light is off.

Turn the handle clockwise.*

Turn* the Bypass Handle clockwise until the Bypass

Switch Position shows OPEN (green window indicator).

The Bypassed to Normal light should go off and the Not

In Automatic light should go off.

Bypass Switch

E

Turn

Bypass

Handle clockwise.

L

Turn the handle counterclockwise.*

Turn* the Bypass Handle counterclockwise until the

Bypass Switch Position shows OPEN (green window indicator). The Bypassed to Emergency light should go off and the Not In Automatic light should go off.

Bypass Switch

E

Turn

Bypass

Handle counterclockwise.

L

N N

ATS

Figure 3–21. Un–Bypass Normal diagram.

ATS

Figure 3–22. Un–Bypass Emergency diagram.

The Automatic Transfer & Bypass–Isolation Switch should be left in this position.

* NOTE

: When Accessory 40*B (reversed Normal & Emergency connections) is specified, the handle push–pull operation is reversed. Follow instructions on the door.

3---7

INDEX

A

auxiliary circuits, 1–2

B

barriers, interphase, 3–4, 3–5 bypassing the ATS, 3–1, 3–2

C

catalog number, 1–1 cleaning, 2–1 connections power, 1–1 contact inspection, 3–4, 3–5 controller disconnecting, 2–1 see Controller User’s Guide

D

delayed transition transfer, 1–4 see Controller User’s Guide

E

electrical operation, 1–4

Emergency Source Accepted light,

1–3 engine starting contacts, 1–2

F

foundation, 1–1 frequency, generator, 2–2 functional test, 1–2, 1–3, 1–4

H

harness, 1–2 disconnect plugs, 2–1

HELP [email protected]

800–800–2726 (ASCO)

I

indicators, contact position, 2–2, 2–3 inspection, 3–1 installation, 1–1 interlocked weights, 2–3 interphase barriers, 3–4, 3–5 isolating the ATS, 3–3, 3–4

L

lifting device, transfer switch, 3–4 lights, 1–2, 1–3, 3–1, 3–2, 3–3 load connected to emergency, 1–3 load connected to normal, 1–3

Load Disconnect Active light, 1–4 lubrication, 2–1

M

maintenance, preventive, 2–1 maintenance handle, 2–3 warning, 2–3 manual load transfer, 2–3 warning, 2–3

N

nameplate, 1–1

Normal Source Accepted light, 1–3

O

operation electrical, 1–4 manual, 2–3 warning, 2–3 optional accessories see Controller User’s Guide parts, 2–1

P

phase rotation check, 1–3 preventive maintenance, 2–1 problem, 2–2

R

rating label, cover replacement parts, 2–1 return to service, 3–5, 3–6, 3–7

S

service

ASCO Services, Inc. (ASI), 2–1 settings see Controller User’s Guide

T

test, functional, 1–2, 1–3, 1–4 testing power cables, 1–1 time delays, 2–1 see Controller User’s Guide

Transfer Control selector switch

Retransfer Delay Bypass, 1–3

Transfer Test, 1–3

Transfer Switch Connected To

Emergency light, 1–3

Transfer Switch Connected To

Normal light, 1–3 transfer test, 1–4, 2–1 transfer to emergency, 1–4, 2–1 transfer to normal, 1–4, 2–1 troubleshooting, 2–2

V

voltage checks, 1–3 voltage, pickup and dropout settings see Controller User’s Guide

Copyright 2007 ASCO Power Technologies, L.P.

Printed in U.S.A.

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