Danfoss VLT AutomationDrive FC 301 Operating Manual page 57

VLT® AutomationDrive FC 301/FC 302
Operating Guide
7.4.70 WARNING 73, Safe Stop Auto Restart
Cause
STO activated.
Troubleshooting
• With automatic restart enabled, the motor can start when the fault is cleared.
7.4.71 ALARM 74, PTC Thermistor
Cause
The PTC is not working. Alarm is related to VLT
7.4.72 ALARM 75, Illegal Profile Sel.
Cause
There was an attempt to write the parameter value while the motor was running.
Troubleshooting
•
Stop the motor before writing the MCO profile to parameter 8-10 Control Word Profile.
7.4.73 WARNING 77, Reduced Power Mode
Cause
The drive is operating in reduced power mode (less than allowed number of inverter sections). The warning is generated on power
cycle when the drive is set to run with fewer inverters and remains on.
7.4.74 ALARM 78, Tracking Error
Cause
The difference between setpoint value and actual value exceeds the value in parameter 4-35 Tracking Error.
Troubleshooting
• Disable the function or select an alarm/warning in parameter 4-34 Tracking Error Function.
• Investigate the mechanics around the load and motor. Check feedback connections from motor encoder to drive.
•
Select motor feedback function in parameter 4-30 Motor Feedback Loss Function.
• Adjust the tracking error band in parameter 4-35 Tracking Error and parameter 4-37 Tracking Error Ramping.
7.4.75 ALARM 79, Illegal Power Section Configuration
Cause
The scaling card has an incorrect part number or is not installed. The MK102 connector on the power card could not be installed.
7.4.76 ALARM 80, Drive Initialized to Default Value
Cause
Parameter settings are initialized to default settings after a manual reset.
Troubleshooting
To clear the alarm, reset the unit.
7.4.77 ALARM 81, CSIV Corrupt
Cause
The CSIV file has syntax errors.
7.4.78 ALARM 82, CSIV Parameter Error
Cause
CSIV failed to initialize a parameter.
7.4.79 ALARM 83, Illegal Option Combination
Cause
The mounted options are incompatible.
Danfoss A/S © 2021.01
PTC Thermistor Card MCB 112.
®
Maintenance, Diagnostics, and
Troubleshooting
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