Danfoss VLT FC 102 Operating Manual page 79

VLT HVAC Drive FC 102
Operating Guide
7.6.64 ALARM 69, Power Card Temperature
Cause
The internal temperature has exceeded the allowed operating limits.
Troubleshooting
• Check that the ambient operating temperature is within the limits.
• Check for clogged filters.
• Check fan operation.
• Check the power card.
7.6.65 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.
7.6.66 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].
7.6.67 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.
7.6.68 WARNING 73, Safe Stop Auto Restart
Cause
STO activated.
Troubleshooting
• With automatic restart enabled, the motor can start when the fault is cleared.
7.6.69 WARNING 77, Reduced Power Mode
Cause
The drive is operating in reduced power mode (less than allowed number of inverter sections). The warning is generated on power
cycle when the drive is set to run with fewer inverters and remains on.
7.6.70 ALARM 79, Illegal Power Section Configuration
Cause
The scaling card has an incorrect part number or is not installed. The MK102 connector on the power card could not be installed.
7.6.71 ALARM 80, Drive Initialized to Default Value
Cause
Parameter settings are initialized to default settings after a manual reset.
Danfoss A/S © 2023.09
PTC Thermistor Card MCB 112 activated the Safe Torque Off (STO).
®
Diagnostics and Troubleshooting
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