Danfoss VLT AQUA Drive FC 202 Operating Manual page 123

Operating Guide | VLT® AQUA Drive FC 202
8.4.67 ALARM 71, PTC 1 Safe Stop
Cause
Because the motor is too warm, the VLT
Troubleshooting
• Once the motor temperature reaches an acceptable level and the digital input from MCB 112 is deactivated, perform 1 of the
following:
- Send a reset signal via bus or digital I/O.
- Press [Reset].
8.4.68 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 Terminal
37 Safe Stop). STO is activated, but X44/10 is not activated.
8.4.69 WARNING 73, Safe Stop Auto Restart
Cause
STO activated.
Troubleshooting
• With automatic restart enabled, the motor can start when the fault is cleared.
8.4.70 ALARM 74, PTC Thermistor
Cause
The PTC is not working. Alarm is related to VLT
8.4.71 ALARM 75, Illegal Profile Sel.
Cause
Do not write the parameter value while the motor is running.
Troubleshooting
• Stop the motor before writing the MCO profile to parameter 8-10 Control Word Profile.
Danfoss A/S © 2020.01
®
PTC Thermistor Card MCB 112 activated the Safe Torque Off (STO).
®
PTC Thermistor Card MCB 112.
Maintenance, Diagnostics, and
Troubleshooting
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