Danfoss VLT FC 103 Operating page 134

VLT® Refrigeration Drive FC 103
Operating Guide
9.3.64 ALARM 68, Safe Stop Activated
Cause
Safe Torque Off (STO) has been activated.
Troubleshooting
• To resume normal operation, apply 24 V DC to terminal 37, then send a reset signal (via bus, digital, or by pressing [Reset]).
9.3.65 ALARM 69, Power Card Temperature
Cause
The temperature sensor on the power card is either too hot or too cold.
Troubleshooting
• Check that the ambient operating temperature is within the limits.
• Check for clogged filters.
• Check fan operation.
• Check the power card.
9.3.66 ALARM 70, Illegal FC Configuration
Cause
The control card and power card are incompatible.
Troubleshooting
• To check compatibility, contact the Danfoss supplier with the type code from the unit nameplate and the part numbers on the
cards.
9.3.67 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].
9.3.68 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 Termi-
nal 37 Safe Stop). STO is activated, but X44/10 is not activated.
9.3.69 WARNING 73, Safe Stop Auto Restart
Cause
STO activated.
Troubleshooting
• With automatic restart enabled, the motor can start when the fault is cleared.
9.3.70 ALARM 74, PTC Thermistor
Cause
The PTC is not working. Alarm is related to VLT
9.3.71 ALARM 75, Illegal Profile Sel.
Cause
Do not write the parameter value while the motor is running.
134 | Danfoss A/S © 2020.09
PTC Thermistor Card MCB 112 activated the Safe Torque Off (STO).
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PTC Thermistor Card MCB 112.
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Maintenance, Diagnostics, and
Troubleshooting
AQ357954340588en-000201 / 130R0881