Carrier 23XL Dokumentacja Pobierz pdf (Strona 86)

Table 14 — Cutler-HammerT Solid-State Starter Troubleshooting Guide

PROBLEM PROBABLE CAUSE AREA OF CORRECTION

(CB) trips (electrically operated

disconnecting means opens) as

it is closed.

Motor is not connected. Connect motor to starter.

Incorrect phase sequence to the starter, 3-phase

power not connected, or terminal loose.

Switch two incoming power leads. The 50 and 51

corresponding motor leads must also be switched to

maintain the same motor rotation.

Shorted SCR. Perform shorted SCR check.

Shunt trip contact between terminals closes due

to shorted SCR.

Perform shorted SCR check.

Shunt trip latching relay not reset (if used). Reset STR relay by pushing RESET button on relay.

CB trips while motor is

running.

Microprocessor detected non-standard operation. Check wiring to logic module or replace logic

module.

CB trips when STOP is pressed. Voltage drop across SCR (looks like shorted

SCR).

Check SCR.

Starter does not pick up and

maintain.

Line voltage is not applied. Check incoming lines for proper voltage.

Overload is not reset. Reset overload.

120 v control voltage is not present. Check control transformer fuse. Check control

circuits.

Heatsink overtemperature switches are open. Check for continuity through overtemperature

switches. Check that all fans are rotating freely.

Check for excessive motor current draw.

Starter maintains but motor does

not accelerate or does not attain

full speed (stalls).

Current limit is too low. Increase current limit setting clockwise. Set ramp

time to minimum (counterclockwise).

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 slowly. Current limit is too low. Increase current limit setting clockwise.

Ramp time is too long. Decrease ramp time setting counterclockwise.

Broken current feedback resistor. Check by recalibrating CFR.

Motor accelerates too quickly. Current limit is too high. Decrease current limit setting counterclockwise.

Improper current feedback. Check current calibrator for proper resistance value.

Pulse start setting is too long. Decrease pulse start time counterclockwise.

Broken current feedback transformer wire. Check for a broken current feedback transformer

wire.

Current limit adjustment has no

effect during acceleration.

Improper current feedback. Check current calibrator for proper resistance value.

Starter or motor is noisy or vi-

brates when starting.

Single phasing due to open phase. Check wiring and overload heater coils.

Single phasing or unbalanced current due to non-

ﬁring SCR.

Check gate lead wiring to SCRs.

Defective motor. Check motor for shorts, opens, and grounds.

Mechanical shock to machine. Current increases too quickly. Decrease starting current counterclockwise. If neces-

sary, increase ramp time clockwise.

End of limit contact does not

close.

Starter is in current limit. Perform SCR full voltage test.

Current trip contact does not

close when current goes above

the trip setting.

Improper current feedback. Check current calibrator for proper resistance value.

Current trip contact closes when

current is below trip setting.

Improper current feedback. Check current calibrator for proper resistance value.

Motor current, voltage, and

speed oscillate.

Power saver is misadjusted. Turn power saver adjustment CCW until oscillations

cease.

Overload relay trips when

starting.

Incorrect heater coils (melting allow). Check heater coil rating.

Loose heater coil. Tighten heater coil.

Long starting time (high inertia applications may

require slow trip overload and oversize starter).

Motor and starter thermal capabilities must be evalu-

ated before extending overload trip times.

Mechanical problems. Check machinery for binding or excessive loading.

Single phasing. See ‘‘Starter or motor is noisy or vibrates when start-

ing’’ symptom in troubleshooting table.

Excessive starting time (current limit may be set

too low).

Increase current limit setting clockwise.

Overload relay trips when run-

ning.

Incorrect heater coils (melting alloy). Check heater coil rating.

Mechanical problems. Check machinery for binding or excessive loading.

Single phasing. See ‘‘Starter or motor is noisy or vibrates when start-

ing’’ problem in troubleshooting table.

Heatsink overtemperature switch

opens.

Excessive current. Check motor current draw.

Defective heatsink, fan. Check that all fans are rotating freely.

Erratic operation. Loose connections. Check all connections.

LEGEND

CCW — Counter Clockwise

CFR — Current Feedback Resistor

STR — Shunt Trip Relay

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 103 104

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