Wearing Parts Replacement; Spared Parts Replacement Time; Chapter 8 Daily Maintenance Of Frequency Inverters; Regular Inspection - Danfoss VFD500 Series Manual

VFD500 high performance vector control frequency inverter user manual

Chapter 8 Daily maintenance of frequency inverters

8.1
Daily maintenance
Due to the influence of temperature, humidity, dust and vibration, it will lead to poor heat dissipation and
component aging of frequency inverter, and results in potential failure or reducing the service life of
frequency inverter. Therefore, it is necessary to do daily and regular maintenance of the frequency
inverter.
8.1.1 Daily maintenance
Due to the influence of temperature, humidity, dust and vibration, it will lead to poor heat dissipation and
component aging of frequency inverter, and results in potential failure or reducing the service life of
frequency inverter. Therefore, it is necessary to do daily and regular maintenance of the frequency
inverter.
Daily check items:
1) Check if the sound is normal during the running of the motor;
2) Check if there is a vibration during the running of the motor;
3) check whether the installation environment of frequency inverter has changed;
4) Check if the cooling fan of frequency inverter is working correctly, the cooling air duct is clear;
5) Check if the frequency inverter is overheating;
6) Make sure that the frequency inverter should always be kept in a clean state;
7) Clear up effectively the dust on the surface of frequency inverter, prevent the dust from entering into
the inside of frequency inverter, especially for the metal dust;
8) Clear up effectively the oil and dust on the cooling fan of frequency inverter.

8.1.2 Regular inspection

Please regularly check the frequency inverter, especially for the difficult checking place of running.
Regular inspection items:
1) Check the air duct and clear up regularly;
2) Check if there are any loose screws;
3) Check if the inverter has been corroded;
4) Check whether the wiring terminals show signs of arcing;
5) Main circuit insulation test.
Note: When using the megger(please use the DC 500V meg ohm meter) to measure the insulation
resistance, you shall disconnect the main circuit with the frequency inverter. Do not use the
insulation resistance meter to test the control circuit. It don't have to do the high voltage test (It
has been done when the frequency inverter produced in factory.)
8.2

Wearing parts replacement

The vulnerable parts of the inverter mainly include cooling fans, electrolytic capacitors, relays, etc. The
life of the inverter is closely related to the environment and maintenance conditions used. Table 8-3 lists
the replacement time and causes of damage to the main components for reference. In addition, if
abnormality is found during maintenance, please replace it in time.
Spared parts
fans
Electrolytic
capacitor
Table 8-3 Spared parts replacement time
Replacing Damaged reasons
time
3 0 0 0 0 ～
B e a r i n g w e a r, b l a d e
aging
60000h
Poor input power quality,
high ambient
4 0 0 0 0 ～ temperature, low air
pressure, frequent load
50000h
changes, electrolyte
aging
1, the blade has cracks
2 abnormal vibration, excessive
noise
1, there is liquid leakage
2, the safety valve protrudes
3, the capacitance value is
beyond the allowable range
4 , i n s u l a t i o n r e s i s t a n c e i s
abnormal
5, DC bus voltage fluctuations are
too large
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Chapter 8 Maintenance
How to check