NVF5 Series User Manual Chapter 1 Safety Information
1.3 Precautions for Users
Danger
The inverter must be covered with the cover plate before power on in case of the
danger of electric shock and explosion!
The inverters which have been stored for more than 2 years must been done precharge
experiment. When energized, the voltage regulator is used to slowly increase the
voltage in case of the danger of electric shock and explosion
！
During power-on, it is not allowed to touch the terminals by hand in case of the danger
of electric shock!
It is not permitted to operate the inverter with a damp hand in case of the danger of
electric shock!
After replacing control boards,the inverter will begin running after parameters are
correctly set in case of the danger of equipment damage!
The products is intended for qualified personnel to test during running in case of the
danger of personal injury or equipment damage!
Please don’t change original factory parameters in case of the danger of equipment
damage
！
Attention
Please ensure the power phase and rated voltage are consistent with the nameplate of
the product in case of the danger of equipment damage!
Check connection of the main circuit of the inverter to ensure disappearance of short
circuit and fastened conenction in case of the danger of equipment damage!
It is not permitted to control the inverter start and stop frequently in a power-on and
power-off mode in case of the danger of equipment damage!
Safety
Information
Description
Compared with
power frequency
running
The inverter is a voltage source type machine and the output
voltage is PWM waves including harmonics. Therefore, the
temperature rise, noise and vibration of the motor will slightly
increase compared with power frequency running.
Constant-torque
low-speed
running
When the inverter drives common AC induction motor to run at a
low speed for a long term, the output torque maybe reduced due to
the heat dissipation effect of the motor. If it is required to run at a
low speed and constant-torque for a long term, a variable frequency
motor must be used.
Electronic thermal
protection value
of motor
When using an adaptive motor, the inverter could perform thermal
protection on the motor. In case that the motor is not matched with
the inverter in rated capacity, the protection threshold value must be
adjusted or other protection must be taken for guaranteeing safe
running of the motor.
Running over
50Hz
In case that the motor runs at the frequency over 50Hz, in addition
to increase of the vibration and noise of the motor, the applied
!
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