Danfoss PTU 025 User Manual

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9.4.67 ALARM 72, Dangerous Failure
Cause
Safe Torque Off (STO) with trip lock.
Troubleshooting
An unexpected combination of STO commands has occurred:
VLT
®
PTC Thermistor Card MCB 112 enables X44/10, but STO is not enabled.
MCB 112 is the only device using STO (specified through selection [4] PTC 1 alarm or [5] PTC 12 warning in parameter 5-19 Termi-
nal 37 Safe Stop). STO is activated, but X44/10 is not activated.
9.4.68 WARNING 73, Safe Stop Auto Restart
Cause
STO activated.
Troubleshooting
With automatic restart enabled, the motor can start when the fault is cleared.
9.4.69 ALARM 74, PTC Thermistor
Cause
The PTC is not working. Alarm is related to VLT
®
PTC Thermistor Card MCB 112.
9.4.70 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.
9.4.71 Warning 76, Power Unit Setup
Cause
The required number of power units does not match the detected number of active power units.
Troubleshooting
When replacing a drive module, this warning can occur if the power-specific data in the module power card does not match the
rest of the drive. Confirm that the spare part and its power card are the correct part number.
9.4.72 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.
9.4.73 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.
9.4.74 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.
AQ262141314214en-000301 / 130R0880148 | Danfoss A/S © 2021.11
Maintenance, Diagnostics, and
Troubleshooting
VLT® HVAC Drive FC 102
Operating Guide

Danfoss PTU 025 Specifications

General

Brand	Danfoss
Model	PTU 025
Category	DC Drives
Language	English