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Precautions for use
Constant torque and low speed operation
When the inverter with ordinary motor runs at low speed for a long time, the motor life will be affected due to
the poor heat dissipation effect. If low speed constant torque long-term operation is needed, special frequency
conversion motor must be selected.
Confirmation of motor insulation
When using VH6 series frequency converter, please confirm the insulation of the motor before connecting the
motor, so as to avoid damaging the equipment. In addition, when the motor is in a bad environment, please
check the insulation of the motor regularly to ensure the safe operation of the system.
Negative torque load
For such occasions as lifting the load, there will often be negative torque, and the frequency converter will trip
due to over-current or over-voltage fault. At this time, the selection of braking resistance should be considered.
Mechanical resonance point of load device
In a certain output frequency range, the inverter may encounter the mechanical resonance point of the load
device, which must be avoided by setting the jump frequency.
Capacitors or varistors to improve power factor
As the output voltage of the frequency converter is pulse wave type, if the output side is installed with
capacitors to improve the power factor or varistors for lightning protection, it will cause the frequency converter
fault trip or device damage. Please remove it. In addition, it is recommended not to add air switch and contactor
and other switching devices on the output side.
The use of derating when setting the fundamental frequency
When the fundamental frequency is lower than the rated frequency, please pay attention to the derating of the
motor to avoid overheating and burning.
Operate at frequency above 50 Hz
If the frequency exceeds 50 Hz, in addition to considering the vibration and noise increase of the motor, it is
also necessary to ensure the speed range of the motor bearing and mechanical device, and make sure to check in
advance.
Electronic thermal protection value of motor
When selecting the suitable motor, the inverter can implement thermal protection for the motor. If the rated
capacity of motor and frequency converter does not match, the protection value must be adjusted or other
protection measures must be taken to ensure the safe operation of motor.
Altitude and derating
In the area with altitude more than 1000 meters, the heat dissipation effect of frequency converter becomes
worse due to the thin air, so it is necessary to reduce the rating.
About the protection level
The protection grade IP20 of VH6 series frequency converter is achieved when the status display unit or
keyboard is selected.
Notes on scrapping
When scrapping the inverter, please pay attention to:
When the electrolytic capacitors in the main circuit and printed circuit board are burned, they may explode.
Toxic gases are produced when plastic parts are burned. Please treat as industrial waste.
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