What causes a motor to run rough with Danfoss D9h DC Drives?
If the motor runs rough with Danfoss DC Drives, check the motor settings in parameter groups 1-2* Motor Data, 1-3* Adv Motor Data, and 1-5* Load Indep. Setting to avoid over-magnetisation.
Why won't the motor brake with Danfoss DC Drives?
If the motor will not brake using Danfoss DC Drives, check parameter group 2-0* DC Brake and 3-0* Reference Limits for possible incorrect settings in the brake parameters or ramp down times that are too short.
What does 'DC link voltage low' mean for Danfoss D9h?
The message 'DC link voltage low' for Danfoss DC Drives means that the intermediate circuit voltage (DC) is lower than the low voltage warning limit.
What does 'Ext. supply' mean on Danfoss D9h DC Drives?
If your Danfoss DC Drives display an 'Ext. supply' error, it means the VLT[®] Extended Relay Option MCB 113 is mounted without external 24 V DC. Either connect a 24 V DC external supply or specify that no external supply is used via parameter 14-80 Option Supplied by External 24VDC.
How to fix earth fault in Danfoss D9h?
An earth fault in Danfoss DC Drives indicates current leakage from the output phases to earth, either in the cable between the frequency converter and the motor or in the motor itself. Remove power to the frequency converter and repair the earth fault. You can also check for earth faults in the motor by measuring the resistance to ground of the motor leads and the motor with a megohmmeter.
What to do if brake check failed on Danfoss D9h DC Drives?
If the brake check failed on your Danfoss DC Drives, it means the brake resistor is not connected or not working. Check 2-15 Brake Check.
What causes line power current imbalance greater than 3% in Danfoss D9h?
If you notice a line power current imbalance greater than 3% in your Danfoss DC Drives, it could be a problem with the line power supply itself. Check the line power supply. If the imbalance remains on the same input terminal, there may be a problem with the unit, and you should contact the supplier.
What to do if Danfoss D9h motor is not reaching maximum speed?
If the motor is not reaching its maximum speed with your Danfoss DC Drives, check if the frequency limits are set correctly and adjust them as needed. Also, verify that the reference input signal is scaled correctly and adjust the settings accordingly.
Why Danfoss D9h DC Drives motor will not brake?
If the motor will not brake in your Danfoss DC Drives, review the brake parameters and ensure they are correctly configured. Also, check if the ramp-down times are too short.
Why is motor speed unstable in Danfoss D9h?
If the motor speed is unstable in your Danfoss DC Drives, it might be due to incorrect parameter settings. Review the settings in parameter group 1-6* Load Depen. Setting. For closed-loop operation, check settings in parameter group 20-0* Feedback.
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