NVF5 Series User Manual Chapter 8 Maintenance
Chapter 8 Maintenance
8.1 Maintenance Instructions
Due to the influence of temperature, humidity, dust and vibration in the environment,
internal component aging and wear of the inverter and many other reasons will lead to the
potential faults; therefore, it is necessary to carry out routine and periodic care and
maintenance for the inverter.
The system maintenance should pay attention：
1 Products must be periodic maintained, inspected, or replaced by qualified personnel,
Failure to comply may result in a risk of electric shock!
2 Leave the metal objects in the machine is strictly forbidden, otherwise there will be a
danger of fire!
3 Please ensure power off when carrying out maintenance or replacement of parts ,
otherwise there is a risk of electric shock
！
4 The maintenance operation should be carried out after power off for 5 minutes, and
the DC bus voltage below 25V, otherwise there is a risk of electric shock
！
5 When maintaining, inspecting, or replacing parts, try not to touch the components,
otherwise there is a danger of electrostatic damage to the components
！
6 All pluggable components must be inserted and drew out in the case of power off
！
8.2 Maintenance Items
8.2.1 In daily check, check whether there is an abnormality in principle running:
1. Whether the motor is running as programming；
2. Whether the environment of industrial field is abnormal；
3. Whether the cooling system is abnormal；
4. Whether there is abnormal vibration noise；
5. Whether overheating or discoloration appear；
6. Measure the inverter input voltage during running with a multimeter.
8.2.2 Regular Inspection
For safety reason When the qualified personnel execute inverter regular check, the
main power supply must be cutted off, the operation panel is no display, the main circuit
power indicator is off 10 minutes later and DC bus voltage is less than 25 V checked with a
multimeter for avoiding the capacitor residual voltage of the inverter injuries person.
1. Cooling system：Please clean the air filter and check whether the cooling fan is
normal.
2. Screws and screw bolts：Because of the influence of vibration and temperature
change, fixed parts such as screws and screw bolts may be loose, check whether
they are reliable and tighten, please tighten them according to the required torque.
3. Check whether conductor and an insulator is corrosion and damaged.
4. Measuring insulation resistance.
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