V&T V5 Series User Manual page 49

P0.03=8
closed-loop encoder control then adjust the low speed loop parameters Pd.03 and Pd.04 .
◆ Speed too fast when downward:
1) Confirm inverter power if correctly selected , inverter should be selected according to the motor
rated current, require inverter rated current to amplify one power level based on corresponding motor
rated current. Because it is crane applications, the inverter and the motor are required to leave some
margin;
2) Ensure that the braking unit and braking resistor selection is correct, make sure that the braking
unit and braking resistor can be in the process of decentralization of energy through the braking
resistor freed, the braking resistor selection, also need to Ensure brake resistor and brake unit to
match;
3) Ensure that lifting weight is in the range of rated weigh;
4) Confirm the motor parameters have been set already and conduct auto tuning;
5) To ensure inverter output torque is enough, the motor's rated output torque is adequate;
6) Ensure brake resistor is turn on.
◆ Slide down when stop:
1) Confirm inverter power if correctly selected , inverter should be selected according to the motor
rated current, require inverter rated current to amplify one power level based on corresponding motor
rated current. Because it is crane applications, the inverter and the motor are required to leave some
margin;
2) Ensure that the load within the range of rated load;
3) If use traditional type brake equipment, ensure there is no problem about brake pads;
4) of it is tapered motor, make sure when motor start to stop it maintains adequate output torque to
ensure motor
braking torque is sufficient;
5) Confirm the motor parameters have been set already and conduct auto tuning;
6) Improve the frequency of brake engage.
◆ Overcurrent, overload:
1) Confirm inverter power if correctly selected , inverter should be selected according to the motor
rated current, require inverter rated current to amplify one power level based on corresponding motor
rated current. Because it is crane applications, the inverter and the motor are required to leave some
margin;
2) Ensure that the load within the range of rated load;
2) Ensure that the load at rated load range;
3) Confirm the motor parameters have been set already and conduct auto tuning;
4) Ensure that the brake is normal intact, the opening and closing logic is correct, there was no
abnormal phenomenon;
high performance crane special inverter User Manual
Chapter 6 Crane specialinverter faults and troubleshooting 39