E. Emerson Tool 3ADTS, 3ATS, 3NTS, 3NDTS User Manual

Installation Manual ASCO 3ATS, 3ADTS, 3NTS, 3NDTS

E

Installation Manual

G-design 1600-3000 A Transfer Switches

DANGER

!

DANGER is used in this manual to warn of a
hazard situation which, if not avoided, will result in
death or serious injury.

WARNING

!

WARNING is used in this manual to warn of a
hazardous situation which, if not avoided, could
result death or serious injury.

CAUTION

!

CAUTION is used in this manual to warn of a
hazardous situation which, if not avoided, could
result in minor or moderate injury.

Refer to the outline and wiring drawings provided
with the 3ATS, 3NTS, 3ADTS, or 3NDTS for all
installation and connection details and accessories.

Refer to User’s Guide 381333-400 for the Goup G
Controller status display messages, time delays,
pickup and dropout settings, and adjustments.

Rating Label

Each 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.

WARNING

!

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

An experienced licensed electrician must install the transfer
switch.

Installation

These transfer switches are factory wired and tested.
Installation requires mounting, connecting service cables, and
connecting engine start and auxiliary control circuits (if
required.).

3ATS, 3ADTS, 3NTS, 3NDTS

Table of Contents

INSTALLATION

Mounting .......................................................... 1

Power Connections .........................................2

Engine Starting Contacts.................................2

FUNCTIONAL TEST

1- Manual Operation........................................3

2- Voltage Checks ...........................................4

3- Electrical Operation .....................................6

TESTING & SERVICE

Transfer Test ...................................................6

Preventive Maintenance ..................................6

Manual Load Transfer .....................................6

TROUBLESHOOTING ....................................7

INDEX..............................................................8

Supporting Foundation

The supporting foundation for the enclosure must be level and
straight. Refer to the applicable enclosure outline drawing
included with the transfer 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 1 inch minimum 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 outline and mounting diagram and mount the
transfer switch according to details and instructions shown on
the diagram. Mount it vertically to a rigid supporting
structure. Level all mounting points by using flat washers
behind the holes to avoid distortion of the transfer switch.

NOTIC

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

381333-406

381333-406 ASCO Power Technologies Page 1

ASCO 3ATS, 3ADTS, 3NTS, 3NDTS Installation Manual

Line Connections

Refer to the wiring diagram provided with the transfer switch.
All wiring must be made in accordance with the National
Electrical Code and local codes.

DANGER

!

De-energize the conductors before making any line
or auxiliary circuit connections. Be sure that the
Normal and Emergency line connections are in
proper phase rotation. Place the 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 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.

Connecting Power Cables

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 the transfer switch. 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 transfer switch. 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.

Harnesses

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

Auxiliary Circuits

Connect auxiliary circuit wires to appropriate terminals on the
transfer switch as shown on the wiring diagram.

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.

Engine Starting Contacts

The engine control contact connections (if used) are located on
the transfer switch for 3ATS & 3NTS or in the upper right
side of the enclosure for 3ADTS & 3NDTS. Connect signal
wires to appropriate terminals as specified in Table A and
shown in Figure 1.

Table A. Engine Start Connections.

When normal

source fails

contact closes TB1 and TB2

contact opens TB1 and TB3

TB

Figure 1. Engine start and auxiliary circuit terminal block.

Emergency
contacts

window
indicators

OPEN or
CLOSED

Normal
contacts

Figure 2. Main contact position indicators on right side.

Terminals on

transfer switch

Page 2 ASCO Power Technologies 381333-406

Installation Manual ASCO 3ATS, 3ADTS, 3NTS, 3NDTS

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 transfer switch.

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

Do not manually operate the transfer switch until
both power sources are disconnected: open both
circuit breakers.

1. After deenergizing both power sources, open the enclosure

2. Install the handle into the hole in the molded hub. Move

3. 3ADTS and 3NTS have two contact shaft hubs. See

4. Return the transfer switch to the Normal position.

Note: If Normal and Emergency connections are reversed this
operation is also reversed.

NOTICE

1 – Manual Operation

WARNING

!

door. Locate and remove the maintenance handle from the
clip on the left side of the transfer switch. See Figures 3, 4,
and 5. See Figure 2 for the contact position indicators.

the handle up or down as shown to manually operate the
transfer switch. It should operate smoothly without any
binding. If it does not, check for shipping damage or
construction debris.

Figure 5.

maintenance

Figure 3. Maintenance handle on 3ATS & 3NTS.

Counterclockwise DOWN
closes the Emergency
source contacts (upper)
and opens the Normal
source contacts (lower)

Clockwise DOWN closes
the Normal source
contacts (lower) and
opens the Emergency
source contacts (upper)

Figure 4. Maintenance handle operation on 3ATS &

3NTS.

maintenance handle

insert handle into
hole in hub

slide hub onto shaft
and insert the pin

Counterclockwise DOWN
OPENS the contacts

shaft to open

Pull out
Emergency source contacts
(upper)
Push in
source contacts (lower)

shaft to open Normal

Clockwise DOWN CLOSES
the contacts
Pull out

shaft to close
Emergency source contacts
(upper)
Push in

shaft to close
Normal source contacts
(lower)

Figure 5. Maintenance handle on 3ADTS & 3NDTS.

381333-406 ASCO Power Technologies Page 3