Emerson ASCO 185 Series User Manual

381333–319 D
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
Operator’s
Manual
Seri es 185
Automatic Transfer Switches
100 t hrou gh 400 am pe re size s
DANGER is used in this manual to warn of high
voltages capable of cau si n g shock , burns, or death .
WARNINGisusedinthismanualtowarn
of possible personal injury.
CAUTIONisusedinthismanualtowarn
of possible equipment damage.
An exp erienced licensed electric ian must install the AT S.
100–230 ampere sizes
Refer to the outline and wiring drawings provided with
your ASCO Series 185 ATS for all installation details.
A SCO Series 185 A utomatic 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 acc or dan c e with
the National Electrical Code, NEC/NFPA 70, Article 702.
This ATS is for use with 2–w ir e automatic–star t genera tor s
only.
Refer to Appl ication Information 381339–292 to confirm
that you have selec ted the appropr iate produc t for the
intend ed instal l atio n .
This automatic transfer switch i s intended for standby
power applications in residential / light commercial use
only.
This product is not intended for emergency
or life–support systems.
If you have mor e strin g e nt application requ irements con tac t
A SCO Power Technol og ies for other products suitable for
cr itic al appl ications.
Rating Label
Eac h autom atic transfer switc h contains a rating lab el to
define the loads and fault circuit withstand / closing ratings.
Refer to the lab el on the transfer switc h 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..................
INDEX 10.................................

Emerson ASCO 185 Series Specifications

General

Manufacturer	Emerson ASCO
Series	185
Category	Switch
Type	Pressure Switch
Function	Pressure Sensing
Connection Type	Threaded
Housing Material	Aluminum

Summary

Operator's Manual Overview

Safety Classifications

Defines DANGER, WARNING, and CAUTION symbols used in the manual for hazard communication.

Installation Prerequisites

States that installation of the ATS must be performed by an experienced licensed electrician.

Installation Procedures

Mounting the Automatic Transfer Switch

Protection Against Installation Debris

Advises protecting the ATS from construction grit and metal chips during installation.

Insulator Installation for 260-400A Switches

Warns about the importance of the insulator backing piece for 260 and 400 Ampere transfer switches.

Electrical Power Connection Guidelines

Covers protection by circuit breakers and NEC requirements for ATS power connections.

Electrical Wiring Safety Precautions

Warns to turn off all power before wiring the transfer switch to prevent electrocution.

Preventing Cable Loosening During Short Circuits

Advises installing cable spacers correctly to prevent cable loosening during short circuits.

Controller Operations and Settings

Safety Reminder for Transfer Test

Advises ensuring safe conditions before using the Transfer Test button.

Controller DIP Switch Settings

Automatic Generator Exerciser Setup

Setting and Cancelling Generator Exercise

DIP Switch Configuration Details

Time Delay Settings Configuration

Voltage and Frequency Settings

Functional Test Procedures

Manual Transfer Switch Operation

Manual Operation Safety Warning

Emphasizes turning off all power before manually operating the transfer switch.

Electrical Operation Testing

Step-by-step procedure to test the ATS's electrical operation and transfer sequences.

Sequence of Operation: Utility Failure

Utility Failure Operational Flow

Illustrates the step-by-step sequence of events during a utility failure and generator startup.

Troubleshooting Common Issues

Utility Acceptable Light Not Illuminating

Addresses why the Utility Acceptable light may not illuminate and provides solutions.

Generator Cranking or Starting Failures

Generator Acceptable Light Not Activating

Failure to Transfer Load to Generator

Advanced Troubleshooting Scenarios

Delayed Load Transfer to Generator

Generator Bogging Down or Shutdown

Failure to Retransfer Load to Utility

Generator Exerciser Malfunctions