Chapter 8 Maintenance
Danger
1. Please do not touch the terminals of frequency inverter, which are provided with the high voltage.
There is the danger of electric shock.
2. Before power is supplied, please do install the terminal casing well. When the casing is dismantled, please
do cut off the power supply.
There is the danger of electric shock.
3. Maintenance and inspection cannot be started until the main circuit power supply is cut off and the
CHARGE LED indicator light is confirmed to go out.
There is the danger of residual voltage on the electrolytic capacitor.
4. Non-professionals are not allowed to do the job of maintenance and inspection.
There is the danger of electric shock.
1. As the CMOS integrated circuit is installed on the keypad panel, the control circuit board and the driving
circuit board, please pay special attention when they are used. If the circuit boards are touched with the
finger directly, the integrated chips on them will be damaged by the electrostatic induction.
2. Please do not change the connection lines or dismantle the terminal lines when power is supplied.
There is the danger of electric shock.
3. Please do not check the signal during operation. Otherwise, the equipment may be damaged.
8.1 Inspection and Maintenance
Inverter is a typical product, which combines the power electronics technology with the microelectronics technology.
Therefore, it double features with industrial Equipment and microelectronics Equipment. The change of environment
such as temperature. Humidity, smog and internal components aging factor will cause kinds of faults to the inverter.
For long time secure operation, daily inspection and regular maintenance (at least 3 or 6 months interval) is needed.
8.1.1 Daily Inspection
Before inverter running, please check below:
Whether there is abnormal sound or vibration with the motor;
whether the frequency inverter and the motor heat up abnormally;
whether the environment temperature is too high;
whether the load ammeter indicates the same value as usual:
whether the cooling fan of frequency inverter operates normally;
Whether the braking resistor has the good earthing insulation.
The daily maintenance and inspection content is showed in Table 8-1.
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