Table 13 — Cut l er-HammerSolid-State Starter Troubleshooting G ui de

Problem Probabl e Caus e Area of Correction

CB trips (electrically
operated disconnecting
means opens) as it is
closed.
Motor is not connect ed. Connect motor to star ter.
Incorrect phase seque nce to the starter, 3-
phase power not conne cted, or terminal
loose.
Switch two incoming p ower leads. The 50
and 51 correspondin g motor leads must
also be switched to maintain the same
motor rotation.
Shorted SCR. Perform shorted SCR ch eck.
Shunt trip contact between te rminals closes
due to shorted SCR. Perform shorted SCR check.
Shunt trip latching re lay not reset (if used). Reset STR relay by pushin g RESET but-
ton on relay.
CB trips while motor is
running. Microprocessor d etected non-standard
operation. Check wir ing to logic module or replac e
logic module.
CB trips when STOP is
pressed. Voltage drop ac ross SCR (looks like
shorted SCR). Check SCR.
Starter does not pick up
and maintain. Line voltage is not a pplied. Check incoming lines for proper voltage.
Overload is not reset . Reset overload.
120 v control voltage i s not present. Check control trans former fuse. Check
control circuits.
Heatsink overtemperatur e switches are
open. Check for continuity th rough overtemper-
ature switches. Check t hat all fans are
rotating freely. Check for excessive motor
current draw.
Starter maintains but
motor does not acceler-
ate or does not attain
full speed (stalls).
Current limit is too low. In crease current limit setting clockwise.
Set ramp time to mi nimum (counterclock-
wise).
Insufficient Torque. Improper current feedb ack. Check current feedback resistor for
proper calibration.
High breakaway torque re quired. Load is not suitable for reduced voltage
starting.
Motor accelerates too
slowly. Current limit is too low. In crease current limit setting clockwise.
Ramp time is too long . Decrease ram p time setting counterclock-
wise.
Broken current feedba ck resistor. Check by recalibrating C FR.