Danfoss VLT AutomationDrive FC 301 Programming Manual page 701

VLT AutomationDrive FC 301/302
Programming Guide
7.2.5 WARNING 5, DC Link Voltage High
Cause
The DC-link voltage (DC) is higher than the high-voltage warning limit. The limit depends on the drive voltage rating. The unit is still
active.
7.2.6 WARNING 6, DC Link Voltage Low
Cause
The DC-link voltage (DC) is lower than the low-voltage warning limit. The limit depends on the drive voltage rating. The unit is still
active.
7.2.7 WARNING/ALARM 7, DC Overvoltage
Cause
If the DC-link voltage exceeds the limit, the drive trips after a certain time.
Troubleshooting
• Extend the ramp time.
• Change the ramp type.
•
Activate the functions in parameter 2-10 Brake Function.
• Increase parameter 14-26 Trip Delay at Inverter Fault.
• If the alarm/warning occurs during a power sag, use kinetic back-up (parameter 14-10 Mains Failure).
• Connect a brake resistor.
7.2.8 WARNING/ALARM 8, DC Undervoltage
Cause
If the DC-link voltage drops below the undervoltage limit, the drive checks for 24 V DC back-up supply. If no 24 V DC back-up supply
is connected, the drive trips after a fixed time delay. The time delay varies with unit size.
Troubleshooting
• Check that the supply voltage matches the drive voltage.
• Perform an input voltage test.
• Perform a soft-charge circuit test.
7.2.9 WARNING/ALARM 9, Inverter Overload
Cause
The drive has run with more than 100% overload for too long and is about to cut out. The counter for electronic thermal inverter
protection issues a warning at 98% and trips at 100% with an alarm. The drive cannot be reset until the counter is below 90%.
Troubleshooting
• Compare the output current shown on the LCP with the drive rated current.
• Compare the output current shown on the LCP with the measured motor current.
• Show the thermal drive load on the LCP and monitor the value.
- When running above the drive continuous current rating, the counter increases.
- When running below the drive continuous current rating, the counter decreases.
7.2.10 WARNING/ALARM 10, Motor Overload Temperature
Cause
According to the electronic thermal protection (ETR), the motor is too hot.
This warning/alarm is controlled by parameter 1-90 Motor Thermal Protection:
• If the parameter is set to warning options, the drive issues a warning or an alarm when the counter is >90%.
• If the parameter is set to trip options, the drive trips when the counter reaches 100%.
The fault occurs when the motor runs with more than 100% overload for too long.
Troubleshooting
• Check for motor overheating.
• Check whether the motor is mechanically overloaded.
Danfoss A/S © 2022.12
Troubleshooting
AU275636650261en-000101 / 130R0334 | 701