Table 10.1 Daily inspection reminder list
inspection
object
Check essentials
Criterion
check content
cycle
means of inspection
operating
environment
1.Temperature and humidity
at any
time
1. Thermometer , hygrometer
1. (-10~+45)℃, (45~55)℃ derating use
2. Dust, water and drip 2. Visual inspection
2. No trace of water leakage
3. Gas
3. Smell
3. No smell
Inverter
1. Vibration, heat
at any
time
1. Surgical Touch
1. Stable vibration and reasonable fan
temperature
2. Noise 2. Hearing
2. No abnormal sound
motor
1. Fever
at any
time
1. Hand touch
1. There is no abnormality in fever
2. Noise 2. Hearing
2. Even noise
Running state
parameters
1. Output current
at any
time
1. Hearing
1. Within the rated range
2. Output voltage
2. Ammeter
2. Within the rated range
3. Internal temperature
3. Thermometer
3. Temperature rise is less than 35K
10.4 Regular maintenance
According to the use environment, the user can conduct a regular inspection of the inverter every3 months
or 6 months.
General inspection content:
(1) If the control terminal screw is loose, tighten it with a screwdriver;
(2) Whether the main circuit terminals have poor contact, whether there is overheating trace at the copper
bar connection;
(3) Whether the power cables and control cables are damaged, especially whether there are cut marks on
the skin in contact with the metal surface;
(4) Whether the insulating bandages of the power cables have fallen off;
(5) Fully clean the dust on the circuit board and air duct, it is best to use a vacuum cleaner;
(6) For the insulation test of the inverter, all input and output terminals (R, S, T, U, V, W, etc.) , otherwise
there is a danger of damaging the inverter, please use a 500V megohmmeter;
(7) If the insulation test is performed on the motor, the input terminals U, V, W of the motor must be
disassembled from the inverter, and the motor must be tested separately, otherwise the inverter will be
damaged.
Notice
1. Only professionally trained personnel can disassemble parts , perform maintenance and replace
parts.
2. Do not leave metal parts such as screws and washers in the machine, otherwise there is a risk of
damage to the equipment.
10.5 Replacement of Vulnerable Parts of the Frequency Converter
Vulnerable parts of frequency converter mainly include cooling fan and electrolytic capacitor for filtering,
and their service life is closely related to the environment of use and maintenance status. The general life time
is shown in Table 10.2.
Notice
test has been passed before leaving the factory , and the user does not need to perform the withstand
voltage test, otherwise the device will be damaged if the test is not done properly .
2. Replacing the original components in the inverter with components with different models and
electrical parameters may cause damage to the inverter.
Table 10.2 Component life
Device name
life time
fan
(3~ 4 ) million hours
electrolytic capacitor
(4~ 5 ) million hours
relay
About 100,000 times
Users can determine the replacement period according to the running time.
(1) Cooling fan
076
NVF2G-S Series Inverter User's Guide
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