8.4.67 ALARM 71, PTC 1 Safe Stop
Cause
Because the motor is too warm, the VLT
®
PTC Thermistor Card MCB 112 activated the Safe Torque Off (STO).
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
®
PTC Thermistor Card MCB 112.
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
.
Maintenance, Diagnostics, and
Troubleshooting
Operating Guide | VLT® AQUA Drive FC 202
AQ275652274277en-000101 / 130R0708| 121
Danfoss A/S © 2020.01
Содержание VLT AQUA Drive FC 202
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