Danfoss VLT HVAC Drive FC 102 Operating Manual page 147

VLT® HVAC Drive FC 102
Operating Guide
9.4.61 WARNING/ALARM 65, Control Card Overtemperature
Cause
The cutout temperature of the control card has exceeded the upper limit.
Troubleshooting
• Check that the ambient operating temperature is within the limits.
• Check for clogged filters.
• Check fan operation.
• Check the control card.
9.4.62 WARNING 66, Heat Sink Temperature Low
Cause
The drive is too cold to operate. This warning is based on the temperature sensor in the IGBT module.
Troubleshooting
• Increase the ambient temperature of the unit.
•
Supply a trickle amount of current to the drive whenever the motor is stopped by setting parameter 2-00 DC Hold/Preheat Cur-
rent to 5% and parameter 1-80 Function at Stop.
9.4.63 ALARM 67, Option Module Configuration has Changed
Cause
One or more options have either been added or removed since the last power-down.
Troubleshooting
• Check that the configuration change is intentional and reset the unit.
9.4.64 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 I/O, or by pressing [Reset]).
9.4.65 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.
9.4.66 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].
Danfoss A/S © 2021.11
PTC Thermistor Card MCB 112 activated the Safe Torque Off (STO).
®
Maintenance, Diagnostics, and
Troubleshooting
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