Emerson ASCO 185 User Manual

Operator’s

Automatic Transfer Switches

Manual

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.

An experienced licensed electrician must install the A TS.

100 throu gh 400 ampe re sizes

Series 185

Refer to the outline and wiring drawings provided with
your ASCO Series 185 ATS for all installation details.

ASCO Series 185 Automatic Transfer Switches (ATSs) are
Listed under Underwriter’s Laboratories Standard for
Transfer Switch Equipment, UL–1008. They are intended
for use only in optional standby system s in accordanc e with
the National Electrical Code, NEC/NFPA 70, Article 702.
This ATS is for use with 2–wire automatic start generators
only.

Refer to Application Informaton 381339–292 to confirm
that you have selected tha appropriate product for the
intended installatio n .

This automatic transfer switch is intended for standby
power applicato n s in residential / lig h t commercial use only.

This product is not intended for emergency
or life–support systems.

If you have more stringen t applicatio n requirements contact
ASCO Pow er Technolog ies for other produc ts suitable for
critical applications.

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.

TABLE OF CONTENTS

page

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

CONTROLLER 2–5........................

FUNCTIONAL TEST 6......................

SEQUENCE OF OPERATION 7.............

TROUBLESHOOTING 8–9..................

100–230 ampere 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
telephone [phone], fax [phone], for service call 1 888 234–2726 (ASCO) www.asco.ca

INDEX 10.................................

381333–319 A

Series 185

Nameplate

The Transfer Switch nameplate includes data for each
specific ASCO Series 185 ATS. Use the ATS only
within the limits shown on this nameplate.

D 185 A 2 200 F 4 C

Neutral

A –standard

Phase Poles

2 –singleØ

Amperes Voltage Controller Enclosure

100

200

230

260
400

clock battery

cable spacers
(see INSTALLATION)

Catalog Number Identification

A typical Catalog Number is shown below with its
elements explained. The example is for a D–design,
2 pole, 200 A, 220–240 V, in a Type 1 indoor enclosure:

F 220--- 240

4 –standard

4X

–if

accessories

ordered

load power
connections

C –Type1

M –Type3R

emergency
power
connections

neutral
connections

terminals

for optional

switch

position

contacts

(shown

installed)

Transfer

Switch

ground

connections

200 ampere size in typical enclosure with location of customer connections

381333–319 A

membrane

controls

generator
control
connections

Controller

harness plug

utility power
connections

INSTALLATION

Series 185

Installation of the ASCO Series 185 automatic transfer
switch (ATS) must be performed by a licensed electrician.
It must be installed according to the National Electrical
Code (NEC) and all local electrical code requirements.
Remove the enclosure cover and inspect the ATS for
shipping damage. If damage is evident do not install the
ATS .

1 --- M o u n t i n g

Refer to the enclosure outline drawing. Mount the ATS
according to details and instructions shown on this
diagram. Mount the ATS vertically to a rigid supporting
structure. Level all mounting points by using flat washers
behind the holes to avoid distortion of the enclosure.

MALFUNCTION or SHORTENED LIFE
Protect the ATS from construction grit and metal
chips to prevent malfunction or shortened life.

Transfer switches rated 260 and 400 amperes are
mounted on an insulator backing piece (installed behind
the transfer switch). If the transfer switch is removed
from the enclosure and then reinstalled, this insulator
must be placed behind the transfer switch. See Figure 1.

2 --- Electrical Power Connections

Refer to the wiring diagram. The ATS must be protected
by suitably sized circuit breakers feeding the utility and
generator source terminals. The rating of the circuit
breakers must be based on the requirements of the
National Electrical Code for its nameplate ampere and
short circuit withstand ratings.

ELECTROCUTION HAZARD Turn off utility
power and turn off the generator to prevent
electrocution when wiring the transfer switch.

Cable Spacers for 200 and 230 A

Three cable spacers are included with 200 and 230
ampere transfer switches. Run the copper power cables
throughthecablespacersasshowninFigure2. Position
the cable spacers approximately 1½ inches from the
terminal lugs.

CABLE LOOSENING DUE TO SHORT CIRCUIT
Install three cable spacers 1 1/2 inches from
the power terminals to prevent the cables from
loosening during a short–short condition.

FLASH HAZARD – DAMAGE
Be sure that the insulator piece is installed behind
the 260 and 400 ampere transfer switches.

insulator
backing
piece

Figure 1. Insulator for 260 and 400 A.

cable spacers

1 ½ inch approximate

use copper power
cables only for
200 and 230 A

cable spacer

Figure 2. Cable spacers for 200 and 230 A.

1

381333–319 A

CONTROLLERSeries 185

The Group 4 digital Controller is used in ASCO Series
185 automatic transfer switches. It provides the sensing,
timing, and control functions for the ATS. This micro–
processor–based controller includes built–in control
buttons and st atus lights for control of the ATS and
generator.

clock
battery
cover
seepage3

Utility
Acceptable
light

Trans fer
Tes t
button

Load on
Utility light

1 --- P u s h B u t t o n s

On the front control display are three push buttons that
control the operation of the generator and the ATS .

Before using the transfer test button, be sure that
conditions are safe for running the generator and
for load transfer.

Transfer Test

Use this button to test the system. This operation starts
the generator and transfers the load. Be sure that
conditions are safe to do this operation.

Bypass Time Delay

Use this button to cancel the active time delay or exercise
period (stops the generator after cooldown).

Set Engine Exerciser

Use this button to set the automatic generator exerciser
(page 3).

2 --- I n d i c a t o r L i g h t s

Bypass
Time Delay
button

Set
Exerciser
button

Automatic
Generator
Exerciser
light

Load on
Generator
light

Generator
Acceptable
light

Figure 3. Front view of controller.

On the f ront control display are five lights that indicate
the status of the sources and the ATS.

Utility Acceptable

This light i ndicates that the utility voltage is acceptable
for connection to the load.

Generator Acceptable

This light indicates that the generator voltage is
acceptable for connection to the load.

Load on Utility

This light indicates that the generator voltage is
acceptable for connection to the load.

Load on Generator

This light indicates that the generator voltage is
acceptable for connection to the load.

Automatic Generator Exerciser

When the utility is acceptable and the load is on the
utility, this light flashes the number of days until the next
exercise period. When i t is off, no exerciser period is set.
The light is also off when the generator is running.

381333–319 A

2