Rockwell Automation Allen-Bradley SMC-PLUS Bulletin 150, Installation Manual

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Chapter Troubleshooting
4-2
4
Figure 4.1 - Motor will not start (no output voltage to motor)
Symptom Possible Causes Remedy
“CONTROL
VOLTAGE” LED On
•
Pilot devices
•
Control voltage
•
Failed control module
•
Check wiring
•
Check control voltage
•
Replace control module
“CONTROL
VOLTAGE” LED Off
•
Control voltage not present
•
Overload trip
•
Failed control module
•
Check for correct control voltage
•
Check overload relay and heater element selection
•
Replace control module
“START” LED On
•
Open gate circuitry
•
Perform resistance check; replace power module if necessary
“STALL” LED On
•
Motor rotor locked
•
Stall select switch set incorrectly
•
Failed control module
•
Correct source of stall
•
Check DIP switch #3 for correct setting
•
Set stall feature off (DIP switch #3 to OFF) then attempt to start
motor
•
Replace control module
LED “TEMP” On
•
Controller ventilation blocked
•
Motor overloaded
•
Controller duty cycle exceeded
•
Fan failure (if used)
•
Ambient temperature limit exceeded
•
Failed Thermister
•
Failed control module
•
Check for proper ventilation
•
Correct motor overload condition
•
Check application duty cycle
•
Check for correct fan operation, replace if necessary
•
Wait for controller to cool or provide external cooling
•
Replace Power Pole
•
Replace control module
LED “LINE” On
•
Open line condition
•
Phase Unbalance
•
Motor not connected properly
•
Shorted SCR
•
Open gate resistors
•
Motor instability
•
Failed control module
•
Check for open line (e.g., blown line fuse)
•
Check power system
•
Check for open load lead
•
Check for shorted SCR, replace if necessary
•
Perform resistance check; replace power module if necessary
•
Check motor
•
Replace control module
Figure 4.2 - Motor rotates but does not accelerate to full speed
Symptom Possible Causes Remedy
“CONTROL
VOLTAGE”
LED On
•
Mechanical problems
•
Check for binding or external loading and correct
•
Repair or replace motor
LED On
•
Failed control module
•
Replace control module
“CONTROL
VOLTAGE”
LED Off
•
Control voltage not present
•
Overload trip
•
Failed control module
•
Check for correct control voltage
•
Check overload relay and heater element selection
•
Replace control module
“START” LED On
•
Open gate circuitry
•
Perform resistance check; replace power module if necessary
“STALL” LED On
•
Motor rotor locked
•
Stall select switch set incorrectly
•
Correct source of stall
•
Check DIP switch #3 for correct setting
•
Set stall feature off (DIP switch #3 to OFF) then attempt to start
motor
•
Failed control module
•
Replace control module
“TEMP”
LED On
•
Controller ventilation blocked
•
Motor overloaded
•
Controller duty cycle exceeded
•
Fan failure (if used)
•
Ambient temperature limit exceeded
•
Failed Thermister
•
Failed control module
•
Check for proper ventilation
•
Correct motor overload condition
•
Check application duty cycle
•
Check for correct fan operation, replace if necessary
•
Wait for controller to cool or provide external cooling
•
Replace Power Pole
•
Replace control module
“LINE”
LED On
•
Open line condition
•
Motor not connected properly
•
Shorted SCR
•
Failed control module
•
Check for open line (e.g., blown line fuse)
•
Check for open load lead
•
Check for shorted SCR, replace if necessary
•
Replace control module