Danfoss D9h, Руководство по эксплуатации

Страница: 143 / 206

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9.4.7 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.
9.4.8 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.
9.4.9 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.
9.4.10 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.
9.4.11 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.
Check that the motor current set in
parameter 1-24 Motor Current is correct.
Ensure that the motor data in parameters 1-20 to 1-25 is set correctly.
AQ262139143212en-000301 / 130R0879 | 143 Danfoss A/S © 2021.10
Maintenance, Diagnostics, and
Troubleshooting
VLT® AutomationDrive FC 302
Operating Guide