Emerson GDESIGN 10003000 A User Manual

Operator’s

Non–Automatic Transfer Switches

Manual

E–desi g n 260–400 A, G–de si gn 1000–3000 A

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

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

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

Series 386

Refer to the outline and wiring drawings provided with
the ASCO Series 386 N–ATS for all installation details.

Rating Label

Each non–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.

Identification Label

The identification label on the Transfer Switch includes
data for each specific ASCO Series 386. Use the switch only
within the limits shown on identification label.

An experienced licensed electrician must install the
Non–Automatic Transfer Switch (N–ATS).

TABLE OF CONTENTS

section-page

INSTALLATION 1-1........................

Mounting and Line Connections 1-1.........

Functional Test 1-2, 1-3.....................

SEQUENCE OF OPERATION 2-1...........

TESTING & SERVICE 3-1..................

Preventive Maintenance 3-1................

Transfer Test 3-1..........................

Trouble-Shooting 3-2......................

ADJUSTMENTS 4-1.......................

Sensor Adjustments 4-1...................

How to Change a Setting 4-1...............

OPTIONAL FEATURES 5-1.................

Motor Load Transfer 5-1...................

Load Disconnect 5-1......................

INDEX back of manual.....................

G–design 1000–1200 A sizes

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

381333–086 D

SECTION 1 INSTALLATION

ASCO 386 Non–Automatic Transfer Switches (N–ATSs)
are factory wired and tested. Field installation simply
requires mounting and connection of service cables, and
auxiliary control circuit s (if required).

Remove the Shipping Skid (large N–ATSs)

For large N–ATSs, open the front door and remove the
four lag screws (2 in front, 2 in rear) securing 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 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.

Mounting

Refer to the Outline and Mounting Diagram provided
with the N–ATS; it shows all mounting details and
instructions.

NOTICE

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

Mount the ASCO 386 vertically to a rigid supporting
structure. Level all mounting points by using flat washers
behind the holes to avoid distortion of the switch.

Auxiliary Cable Boxes for 1000 and 1200 A

For G–design 1000 and 1200 ampere sizes, auxiliary
cable boxes are required for all (normal, emergency, &
load) bottom or top entry. Be sure to install auxiliary
cable boxes if both service and load cables are entering
through the top or bottom of enclosure. Consult ASCO
Power Technologies.

Be sure that the insulator piece is behind the 260
and 400 ampere transfer switches.

insulator
backing
piece

Figure 1-1. Insulator for E–design 260 and 400 ampere

Controller Ground

The controller is mounted on the cabinet door. The
transfer switch is connected to the left side of the
controller by a plug–in harness (two plugs). An add-on
DIN rail is provided for some optional accessories and is
mounted below the controller on the door.

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 betwee n the enclosure and the door. This
connection provides proper grounding which does not
rely upon the door hinges.

Auxiliary Circuits

Connect auxiliary circuit wires to appropriate terminals
on transfer switch terminal block TB as shown on the
wiring diagram provi ded with this Non–Automatic
Tra ns f e r Swi tc h.

Read all instructions on the Wiring Diagram and labels
affixed to the non–automatic transfer swi tch. Note the
control features that are provi ded and review their
operation before proceeding.

Insulator Backing Piece for 260 and 400 A

E–design transfer switches rated 260 and 400 ampere are
mounted on an insulator backing piece (installed behind
the transfer switch). If the transfer switch is removed
from the cabinet and then reinstalled, this insulator
piece must be placed behind the transfer switch. See
Figure 1-1.

1 --- 1

INSTALLATION (continued)

Line Connections

A Wiring Diagram is furnished with the ASCO 386
(separate from this manual). Refer to this drawing. All
wiring must be made in accordance with the National
Electrical Code and local codes.

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 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
should be tested to verify that they are not defective or
have been damaged during installation.

they are connected, they

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 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 switch. B e 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.

Bus Connections

If bus connection is used, use SAE grade 5 hardware to
connect bus to appropriate terminal p lates on the
transfer switch. Wipe off bus surfaces before they are
joined. If bus is very dirty, gently clean surfaces with a
non–flammable solvent. Avoid touching cleaned
surfaces.

Do not breathe cleaning solvent vapors.

UseSAEgrade5hardwareandtightentheboltedjointsto
thetorquespecifiedinTableA.

NOTICE

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
3/4 155

Continue to 1–ManualOperationTest on next page.

Recommended

Tightening Torque

in foot pounds

Do not run cables behi nd the switch. Cables can be
bundled on the right side of the switch. Maintain proper
electrical clearance between the live metal parts and
grounded metal: ½ inch minimum for 260-400
amperes, 1 inch minimum over 400 amperes.

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