Danfoss VLT HVAC Drive FC 102 Operating Manual page 118

Operating Guide | VLT® HVAC Drive FC 102
Troubleshooting
• Check that the ambient operating temperature is within the limits.
• Check for clogged filters.
• Check the fan operation.
• Check the control card.
8.4.63 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 Current to
5% and parameter 1-80 Function at Stop.
8.4.64 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.
8.4.65 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]).
8.4.66 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.
116 | Danfoss A/S © 2020.01
Maintenance, Diagnostics, and
Troubleshooting
AQ275556502253en-000101 / 130R0706