VLT
®
MICRO
Chapter 6
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oubleshooting and Fault Informationoubleshooting and Fault Information
oubleshooting and Fault Informationoubleshooting and Fault Information
oubleshooting and Fault Information
The AC motor drive has a comprehensive fault diagnosis system that includes more than
20 different alarms and fault messages. Once a fault is detected, the corresponding
protective functions will be activated to turn off the AC drive output. The different AC
motor drive failures may be classified as follows:
• Over Voltage / Low Voltage
• Heatsink Over Temperature
• Motor Overload
• AC motor drive Overload
• Motor Stalled
• Microprocessor Systems Failure
The three most recent faults are stored in the AC drive non-volatile memory and may be
read through the digital control panel, or through the RS-485 interface on the control
board.
This section provides information to guide the user in understanding the AC drive fault
conditions and the related general troubleshooting procedures. A listing and description
of the AC drive failures is given, along with their possible solutions. A section on general
troubleshooting is also included for reference.
Important: Pressing the Reset button will not restore the AC drive to its normal
operating conditions unless the fault is corrected. During any failure, the AC drive
switches off and an error message will appear in the display. The last error that occurred
is stored in Pr.73.
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