Symcom 201A-AU, 201-575-AU Installation Guide

INSTALLATION
INSTRUCTIONS

Rapid City, SD, USA, 02/2010

MODELS 201A-AU

201-575-AU

Revision B1

II_201A-AU_B1

2880 North Plaza Drive, Rapid City, South Dakota 57702

[phone] · [phone] · fax [phone]

BE SURE POWER IS DISCONNECTED PRIOR TO INSTALLATION!

FOLLOW NATIONAL, STATE AND LOCAL CODES.

SymCom’s MotorSaver
designed to protect 3-phase motors regardless of size. It is used on 190-480VAC (475-600 for
Model 201-575-AU), 50/60 Hz motors to prevent damage caused by single-phasing, low voltage,
high voltage, phase reversal, or voltage unbalance conditions.

CONNECTIONS

READ THESE INSTRUCTIONS ENTIRELY BEFORE INSTALLATION.

®

Model 201A-AU is an auto ranging plug-in voltage / phase monitor

1. Locate a convenient location in or near the motor control panel. If the location is wet or
dusty, the MotorSaver

2. Mount an 8-pin socket to the motor control back panel (SymCom P/N OT08-PC, sold
separately, is required for UL rating).

3. Connect L1, L2 and L3 (terminals 3, 4 & 5 on the relay socket) to the LINE SIDE of the

motor starter as shown in Figure 1.

4. Connect the output relay to the circuitry to be controlled. For motor control, connect the
normally open contact in series with the magnetic coil of the motor starter, and for alarm
operation, connect the normally closed contact in series with the control circuit. See Figure
1 for details.

5. Plug the MotorSaver

®

should be mounted in a NEMA 4 or 12 enclosure.

®

into the socket.

© 2010 SymCom, Inc. All Rights Reserved 2

Figure 1: Typical Wiring Diagram for Control and Alarm

Figure 2: Pin-Out Diagram

© 2010 SymCom, Inc. All Rights Reserved 3

SETTINGS

Rotate the knobs to the appropriate setting for the application following the guidelines below. Do not
apply excessive force when adjusting settings.

L ine Voltage

Rotate the VOLT ADJ. (VAC) knob to the nominal 3-phase line voltage feeding the motor to be
protected.

R estart Delay

Rotate the RESTART (SEC) knob to the desired position. The restart delay is the time between the
MotorSaver® measuring acceptable voltage and closing its output contacts. For compressor
applications, the restart delay should be set for the approximate time it takes for the head pressure to
bleed off of the compressor. For other applications, the restart delay is typically set between 10 and
20 seconds.

T rip Delay

Rotate the TRIP DELAY (SEC) knob to the desired setting. This setting does not affect the trip delay
on single-phasing faults (See SPECIFICATIONS Table). Typically, the trip delay is set between 1 and
5 seconds. In areas where voltage fluctuations are frequent, the trip delay may be set greater than 10
seconds.

V oltage Unbalance

Rotate the UNBALANCE TRIP (NEMA%) knob to the desired unbalance trip level. The NEMA MG1
standard does not recommend operating a motor above 1% voltage unbalance without derating the
motor. The NEMA MG1 standard also recommends against operating a motor above a 5% voltage
unbalance under any circumstances. SymCom recommends consulting the motor manufacturer for
specific tolerances.

Figure 3: Adjustment Knobs

© 2010 SymCom, Inc. All Rights Reserved 4