Emerson 7ADTB User Manual

7000 Series 7ADTB

Operator’s

Manual

Automatic Delayed–T ransition T ransfer

& Bypass–Isolation Switches

G design 1000 through 3000 amp. sizes

DANGER is used in this manual to warn of high

voltages capable of causin g shock, burns, or death.

WARNINGisusedinthismanualtowarn

of possible personal injury.

CAUTIONisusedinthismanualtowarn

of possible equipment damage.

TABLE OF CONTENTS

section-page
INSTALLATION

Mounting 1-1.............................

Power Connections 1-2....................

Engine Starting & Auxiliary Circuits 1-2......

Functional Test 1-3, 1-4.....................

TESTING & SERVICE
Transfer Test & Preventive Maintenance 2-1..

Trouble-Shooting 2-2......................

BYPASSING & ISOLATING

Bypassing the ATS 3-1....................

Isolating the ATS 3-2......................

Return to Service 3-3, 3-4...................

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

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

Refer t o Group 5 Controller User’s Guide 381333–126
for ATS stat us display messages, time delays, pickup
& dropout settings, and adjustments.

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 /c losin g
ratings. R efer 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.

Nameplate

The Transfer Switch nameplate includes data for each
specific 7000 Series 7ADTB Use the switch only
within the limits shown on this nameplate. A typical
Catalog Number is shown below with its elements
explained:

Catalog Number Identification

Typical 7000 Series ADTB catalog no. for switching
neutral, 3 pole, 1600 amp., 480 V, in Type 1 enclosure:

G7ADTB B 3 1600 N 5 C

Neutral

A –solid

B – switching

blank – none

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

Phase Poles

2 –singleØ
3 –threeØ

50 Hanover Road, Florham Park, New Jersey 07932–1591 USA
For sales or service call 1 800 800–2726 (ASCO) www.ascopower.com

Amperes Voltage Controller Enclosure

1000

1200

1600

2000

3000

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

5 –standard
5X –if

accessories

ordered

C –type1

F –type3R

G –type4

L –type12

blank – open type

381333–140 B

SECTION 1 INSTALLATION

The ASCO 7000 Series Automatic Delayed–Transi tion
Transfer & Bypass–Iolation Switch (ADTB) consists of
an upper bypass–isolation switch, a transfer switch, a
monitoring and transfer control panel, and door–
mounted controls. The ADTB is factory wired and
tested. Installation requires removal of the shipping skid
then securing the enclosure to the supporting founda­tion.

Remove the Shipping Skid

Open the front lower door and remove the two front lag
screws securing the enclosure to the wood skid. Next
remove the rear lower panel and remove the two rear lag
screws securing the enclosure to the wood skid.

Supporting foundation and mounting

The supporting foundation for the enclosure must be
level and straight. Allow at least 35 inches in front of the
enclosure for draw out of the Transfer Switch. Refer to
the enclosure outline drawing included with the 7000
Series ADTB 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 t o the appropriate enclosure outline drawing for
specified cable entrance area and location. Providecable
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.

Figure 1-1. Typical enclosure,

Mounting

Refer to the enclosure outline drawing furnishe d with
this switch and mount the 7000 Series ADTB according
to the details and instructions shown on the drawing.

Remove three Shipping Angles

from the Transfer Switch

Open the lower front door. The Transfer Switch carriage
is secured to the frame for shipment. Remove the three
shipping angle (1 upper left, 1 upper right, 1 lower right).

To prevent serious damage, remove three
shipping angles from the Transfer Switch
carriage. Do not turn the Isolation Handle
until they are removed!

remove 3 shipping
L–angles from transfer switch

Figure 1-2. Remove three shipping L–angles.

1 --- 1

INSTALLATION (continued)

Bus Connections

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.

Testing Power Conductors

Do not connect the power conductors to the ADTB 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.

Protect the switch from construction grit

and metal chips to prevent malfunction or

shortened life of the ADTB switch.

Connecting Power Conductors

A Wiring Diagram is furnished with the ADTB. Allwiring
must be made in accordance with the local codes. 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 this ADTB. Make
sure that 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 ADTB. Be careful
when stripping insulation from conductors; avoid nicking
or ringing the conductor. Remove surface oxides from
conductors by cleaning with a wire brush. Follow
conductor manufacturer’s instructions when aluminum
conductor is used. Apply joint compound to conductor,
then carefully wipe away excess compound. Tighten the
cable lugs to the torque specified on the rating label.

If bus connection is used, use SAE grade 5 hardware to
connect bus to appropriate terminal plates on bypass
switching device. Wipe off bus surfaces before they are
joined. If bus is dirty, gently clean surfaces with a
non-flammablesolvent. Avoid touching cleaned surfaces.

Do not breathe cleaning solvent vapors.

UseSAEgrade5hardwareandtightentheboltedjoints
tothetorquespecifiedinTableA.

The reliability of the connection depends

on how clean and how tight the joint is.

Table A . Tightening torque values for bolted joints.

Bolt Diameter

(Grade 5 hardware)

in inches

5/16 12

3/8 20
1/2 50
5/8 95

Recommended

Tightening Torque

in foot pounds

Harnesses

All internal connections are made at the factory. The
bypass switch, transfer switch, and control panel are
joined together by an interconnecting wire harness. The
disconnect plugs are already engaged on enclosed
switches. For opentype switches, the plugs must be
engaged after installation is completed. Align harness
plugs with sockets in the control and push them together
until they are secure.

Engine Starting Contacts

and Auxiliary Circuits

The engine control contact signal connections and
auxiliary circuits are located on terminal block TB as
shownontheWiring Diagram provided with the ADTB.
Connect the signal wires to the appropriate terminals.

Be sure that the Normal and Emergency power

connections are in proper phase rotation.

1 --- 2

INSTALLATION

(continued)

GREEN

RED

observe
these lights

GREEN

RED

AMBER

Figure 1-3. Standard controls and indicators.

Functional Test

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

After installing the ADTB check the following:

– Bypass Handle should be in the OPEN position.

– Isolation Handle should be in the CLOSED position.

– CN transfer switch should be CLOSED.
– CE transfer switch should be OPEN.

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

Close the normal source circuit
breaker. The Transfer Switch
Connected To Normal and the

1

Normal Source Accepted lights
should come on.

Use an accurate voltmeter to
check phase to phase and
phase to neutral voltages pres-

2

entatthetransferswitchnormal
source terminals.

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

3

Switch Connected To Normal &
Emergency Source Accepted

lights should come on.

Load

Disconnect

Active

Load

Disconnect

Active

1–VoltageChecks

First check nameplate on transfer switch; rated voltage
mustbethesameasnormalandemergencylinevoltages.

Useextremecautionwhenusingameter

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 1–3.

■ 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 ADTB will respond only
to rated voltage specified on the nameplate.

Now continue to 2 – Electrical Operation on next page.

Use an accurate voltmeter to
check phase to phase and
phase to neutral voltages pres-

4

ent at the transfer switch emer­gency source terminals.*

Useaphaserotationmeterto
check phase rotation of emer-

5

gency source; it must be the
same

as the normal source.

Shut down the engine–genera­tor , if applicable. The Emergen-
cy Source Accepted light should
go off. Then put the starting

6

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

1 --- 3

C

B

A

Load

Disconnect

Active