Instruction Manual

Larson Electronics, LLC
Phone: [phone]
Fax: [phone]
www.larsonelectronics.com
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TROUBLESHOOTING PROCEDURES
As with any troubleshooting procedure, there is no substitute for a clear understanding of the installation procedures
involved. The contents of this manual should be studied and THOROUGHLY UNDERSTOOD.
Make absolutely certain that all factory installation procedures regarding physical mounting, protection from foreign
material, wire sizing, fuse protection, etc., have been followed. Check all connections to be certain that they are tight.
CAUTION - This is a high voltage (220V) device. Disconnect power prior to installing or removing the phase converter or
attempting to troubleshoot the installation.
Problem
Symptom
Corrective Action
1. Motor will not start
A. Is your motor single phasing?
(Is your motor turning very
slowly and / or making a
growling or grinding sound?)
a. No. You do not have
single phase power to
your machine.
b. Yes. Single phase
power is reaching your
machine. Refer to
Symptom B below.
B. What is the red light doing?
a. Light is flashing on
and off?
There is a clicking
sound in the converter.
1. You have an open circuit. Check all
switches, starters, fuses & breakers.
2. Your system is wired incorrectly.
Make absolutely certain that M3 (mfg
leg) is used to power motor only.
1. Your motor may be wired for 440V.
Check to determine that the motor is
wired for 220V.
2. You may have a bad connection.
Check that all connections are tight.
3. The starting characteristics of your
motor may not be compatible with this
phase converter. Some motors have
special or unique starting
requirements and a one size smaller
converter is necessary.
MTPC-SCHD Series