Carrier PC211 specifications Cutler-Hammer Solid-State Starter Troubleshooting Guide

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.