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
• 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
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