Table 13 — Cutler-Hammer ® Solid-State Starter Troubleshooting Guide

Problem

Probable Cause

Area of Correction

 

 

 

CB trips (electrically

Motor is not connected.

Connect motor to starter.

operated disconnecting

 

 

Incorrect phase sequence to the starter, 3-

Switch two incoming power leads. The 50

means opens) as it is

phase power not connected, or terminal

and 51 corresponding motor leads must

closed.

loose.

also be switched to maintain the same

 

 

 

motor rotation.

 

 

 

 

Shorted SCR.

Perform shorted SCR check.

 

 

 

 

Shunt trip contact between terminals closes

Perform shorted SCR check.

 

due to shorted SCR.

 

 

 

 

 

Shunt trip latching relay not reset (if used).

Reset STR relay by pushing RESET but-

 

 

ton on relay.

 

 

 

CB trips while motor is

Microprocessor detected non-standard

Check wiring to logic module or replace

running.

operation.

logic module.

 

 

 

CB trips when STOP is

Voltage drop across SCR (looks like

Check SCR.

pressed.

shorted SCR).

 

 

 

 

Starter does not pick up

Line voltage is not applied.

Check incoming lines for proper voltage.

and maintain.

 

 

Overload is not reset.

Reset overload.

 

 

 

 

 

120 v control voltage is not present.

Check control transformer fuse. Check

 

 

control circuits.

 

 

 

 

Heatsink overtemperature switches are

Check for continuity through overtemper-

 

open.

ature switches. Check that all fans are

 

 

rotating freely. Check for excessive motor

 

 

current draw.

 

 

 

Starter maintains but

Current limit is too low.

Increase current limit setting clockwise.

motor does not acceler-

 

Set ramp time to minimum (counterclock-

ate or does not attain

 

wise).

full speed (stalls).

 

 

 

 

 

Insufficient Torque.

Improper current feedback.

Check current feedback resistor for

 

 

proper calibration.

 

 

 

 

High breakaway torque required.

Load is not suitable for reduced voltage

 

 

starting.

 

 

 

Motor accelerates too

Current limit is too low.

Increase current limit setting clockwise.

slowly.

 

 

Ramp time is too long.

Decrease ramp time setting counterclock-

 

 

 

wise.

 

 

 

 

Broken current feedback resistor.

Check by recalibrating CFR.

 

 

 

Page 307
Image 307
Carrier PC211 Cutler-Hammer Solid-State Starter Troubleshooting Guide, Problem Probable Cause Area of Correction