Precautions
illustrate
Motor insulation
inspection before
connecting to the
inverter
Before the motor is used for the first time or after being placed for a long time, the
insulation of the motor should be checked to prevent the inverter from being damaged
due to the insulation failure of the motor winding. Wiring as shown in the figure, please
use a 500V voltage type megohmmeter when testing, and ensure that the measured
insulation resistance is not less than 5MΩ .
Motor input terminal
The motor
megger
grounding
6.2 Precautions for use
When the customer officially uses the inverter, please confirm:
Step 1: Confirm the type of load machinery that the inverter will drive. In actual operation, whether the inverter is
overloaded; whether the inverter needs to amplify the power level.
Step 2: Confirm whether the actual operating current of the load motor is less than the rated current of the inverter.
Step 3: Whether the control precision required by the actual load is the same as the control precision that the inverter
can provide.
Step 4: Confirm whether the grid voltage is consistent with the rated voltage of the inverter.
Step 5: Confirm whether the required communication method requires an optional card.
Precautions
illustrate
Capacitors or varistors to
improve power factor
Since the output of the inverter is PWM wave, if a capacitor for improving the power
factor or a varistor for lightning protection is installed on the output side, it will cause
the inverter to trip or damage the device. Please remove it.
The use of switching devices
such as contactors installed
on the output terminals of
the inverter
If you need to install switching devices such as contactors between the inverter output
and the motor, please ensure that the inverter is on and off when there is no output,
otherwise the inverter may be damaged.
Use other than the rated
voltage value
It is not suitable to use the frequency converter outside the allowable operating voltage
range, if necessary, please use the corresponding step-up or step-down device for
voltage transformation.
Lightning Surge Protection
The inverter is equipped with a lightning overcurrent protection device, which has a
certain self-protection ability against induced lightning.
Altitude and Derating
In the area where the altitude exceeds 1000 meters, the heat dissipation effect of the
inverter is deteriorated due to the thin air, so it is necessary to derate for use. The
relationship curve between the rated current of the inverter and the altitude.
current
highly
022
NVF2G-S Series Inverter User's Guide
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