10.3 Routine care and maintenance
The inverter must operate in accordance with the specified operating environment, and some accidents
may occur during operation. The user should follow the tips in Table 10.1 to do daily maintenance work. It is a
good way to prolong the service life of the inverter to maintain a good operating environment, record the data
of daily operation, and find out the cause of the abnormality early.
10.1 Contents of this chapter
Due to the influence of the temperature, humidity, dust and vibration of the environment, the aging and
wear of the components inside the frequency converter, etc., many reasons will lead to potential failures of the
frequency converter. Therefore, it is necessary to implement daily and regular maintenance and maintenance of
the frequency converter.
Note: Before inspection and maintenance, please confirm the following items first, otherwise there may be
a risk of electric shock:
1. The inverter has cut off the power supply;
2. After the cover is opened, the charging indicator light goes out;
3. Use a DC high voltage meter to measure the voltage between the DC busbars to be less than 36V.
10.2 Inspection items
10.2.1 Daily inspection In principle, check whether there is any abnormality during operation:
1) Whether the motor runs according to the setting;
2) Whether the environment of the installation site is abnormal;
3) Whether the cooling system is abnormal;
4) Is there any abnormal vibration sound;
5) Whether there is overheating and discoloration;
6) Use a multimeter to measure the input voltage of the inverter during operation.
10.2.2 Regular inspection
During the regular maintenance and inspection of the inverter, be sure to cut off the power supply, wait
for 10 minutes after the monitor (keyboard) has no display and the indicator light of the main circuit power
supply is off, and then check the DC bus voltage with a multimeter with DC gear to be less than 36V , so as to
avoid damage to the inverter. The residual voltage of the capacitor can injure maintenance personnel.
1) Cooling system: Please clean the air filter and check whether the cooling fan is normal.
2) Screws and bolts: due to vibration, temperature changes, etc., fixed parts such as screws and bolts may
be loose, check whether they are tightened reliably, and please tighten them according to the tightening
torque.
3) Check whether the conductor and insulator substances are corroded and damaged.
4) Measure the insulation resistance.
5) Check the filter capacitor for discoloration, peculiar smell, bubbling, leakage, etc.
10
Maintenance and Troubleshooting
Inverter
500V DC
tramegger
Figure 10.1 Main circuit insulation resistance test
075
NVF2G-S Series Inverter User's Guide
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