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Refer to the following table for routine inspection:
Inspection items
Inspection area
Inspection items
Operating Environment Frequency inverter installation site
Temperature, humidity, dust, metal dust, harmful gases
Frequency inverter
body
Inside the cabinet
Temperature, sound, peculiar smell
Display
LED monitor, meter
Whether the monitoring data is normal, such as input
voltage, output current, output frequency output voltage, etc.
Loads
Motor and its wiring and connection
terminals
The temperature and sound of the motor, the temperature of
the wire and whether there is abnormal heat at the terminal
Daily cleaning:
1) Keep the doors and windows of the frequency inverter room closed and the filtering device of the cooling
system in a normal and clean state.
2) The frequency inverter should always be kept in a clean state. Validly remove dust on the surface area of the
frequency inverter to prevent dust accumulation from entering the frequency inverter. Especially the metal dust
7.1.2 Regular maintenance
Regular inspections should be carried out at places that are difficult to inspect during operation. The inspection
shall be carried out at least ten minutes after the power failure. Refer to the following table for regular inspection
items:
Inspection items
Check content
Countermeasures
Main loop terminal,
control loop terminal
Whether the bolts and screws are loose,
and whether there are any spark marks
Processing is normal
Fan cooling
Whether there is dust accumulation,
whether the fan blade movement is
blocked or whether there is abnormal
sound and vibration, and whether the wind
turbine housing is overheated and
deformed
Replace defective products
Printed circuit board
Whether there is overheating or burning.
Dust accumulation
The former changes plates as the case may be, while the
latter blows the ash OFF with dry air of several atmospheres
Connector
Is it loose
Reinsert
Electrolytic capacitor Is there any leakage or bubbling
discoloration?
Replace with new products
Heat sink
Is there dust accumulation
Dust removal, air duct cleaning,
Insulation situation
Insulation of main circuit to ground
Use a 500 v megohmmeter and disconnect the control
circuit from the main return circuit, the power supply and the
load from the frequency inverter
Ambient air
Is it corroded
Transforming the environment
7.1.3 Replacement of vulnerable parts of frequency inverter
The vulnerable parts of the frequency inverter mainly include cooling fans and electrolytic capacitors for filtering,
followed by printed circuit boards and fuses, etc. their life span is closely related to the environment in which they are
used and their maintenance conditions. The user can determine the replacement period based on the running time.
The typical life time of these devices is:
Device name
Life time
Fan
2-3 years
Electrolytic condenser
4-5 years
Printed circuit board
5-8 years
1) Fan cooling
