Installation and Wiring
6
6.1 Precautions for installation
　 　After the inverter is installed, please pay attention to check the installation of the inverter:
Step 1: Input power cables and motor cables to see if the ampacity selection meets the actual load requirements.
Step 2: Whether the peripheral accessories of the inverter are selected correctly and installed correctly; whether the
installation cable meets its flow requirements; including input reactor, input carrier, output reactor, DC reactor
braking unit and braking resistor.
Step 3: Whether the inverter is installed on flame-retardant materials; and whether the heating accessories (reactors,
braking resistors) are kept away from flammable materials.
Step 4: Whether all control cables have been routed separately from power cables; whether the routing has fully taken
into account the special requirements of E MC .
Step 5: Whether all wiring systems have been properly grounded according to the requirements of the inverter.
Step 6: Whether the installation spacing of all installations of the inverter is installed according to the requirements of
the manual.
Step 7: Check whether the installation method of the inverter is consistent with the requirements in the manual; try to
install it vertically.
Step 8: Confirm whether the external wiring terminals of the inverter are fastened and whether the torque meets the
requirements.
Step 9: Confirm that there are no screws, cables, or other conductive objects left inside the inverter. If there is, please
take it out.
Precautions
illustrate
Compared with power
frequency operation
The output voltage is a PWM wave, which contains certain harmonics. Therefore, the
temperature rise, noise and vibration of the motor during use are slightly increased
compared with power frequency operation.
run at low speed
When the frequency converter drives an ordinary motor to run at low speed for a long
time, the output torque must be reduced due to the deterioration of the heat dissipation
effect of the motor. If it needs to run at low speed and constant torque for a long time, a
variable frequency motor must be selected.
Motor electronic thermal
protection value
When selecting a suitable motor, the frequency converter can implement thermal
protection for the motor. If the rated capacity of the motor does not match the frequency
converter, it is necessary to adjust the protection value or take other protection measures
to ensure the safe operation of the motor.
at frequencies above
5 0Hz
If the operation exceeds 50Hz , in addition to considering the increased vibration and noise
of the motor, it is also necessary to ensure the operating speed range of the motor bearings
and mechanical devices. Be sure to inquire in advance .
Lubrication of mechanical
devices
Mechanical devices that require lubrication, such as gearboxes and gears, may be damaged
due to poor lubrication effect during long-term low-speed operation, so be sure to check
in advance.
Negative torque load
For occasions such as thousands of lifting loads, negative torque often occurs, and the
inverter often trips due to overcurrent or overvoltage faults. At this time, it should be
considered to select a braking component with appropriate parameters.
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.
Occasions with frequent
start and stop
It is suitable for starting and stopping the inverter through the terminals. It is strictly
forbidden to use contactors and other switching devices on the input side of the inverter
for direct frequent start and stop operations, otherwise the equipment will be damaged.
021
NVF2G-S Series Inverter User's Guide
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