Chapter 8 Maintenance
Shenzhen Hpmont Technology Co., Ltd
―
112
―
HD20 Series Inverters User Manual
Table 8-1 Daily checking items
Items
Content
Criteria
Operating
environment
Temperature and humidity
-10
－
+40
℃
, derating at 40
－
50
℃
Dust and water dripping
No water dripping
Gas
No strange smell
Inverter
Oscillation and heating
Stable oscillation and proper
temperature
Noise
No abnormal sound
Motor
Heating
No overheating
Noise
Low and regular noise
Operating status
parameters
Output current
Within rated range
Output voltage
Within rated range
8.2 Periodical Maintenance
Customer should check the inverter in short time or every 3 to 6 months according to the actual
environment so as to avoid hidden problems and make sure the inverter runs well for a long time.
General Inspection:
•
Check whether the screws of control terminals are loose. If so, tighten them with a screw
driver;
•
Check whether the main circuit terminals are properly connected; whether the mains cables
are over heated;
•
Check whether the power cables and control cables are damaged, check especially for any
wear on the cable tube;
•
Check whether the insulating tapes around the cable lugs are stripped, and for signs of
overheating near terminations;
•
Clean the dust on PCBs and air ducts with a vacuum cleaner;
Note:
1. Dielectric strength test of the inverter has already been conducted in the factory. Do not do the
test again. Otherwise, the inverter might be damaged.
2. If insulation test to the motor is necessary, it should be done after the motor’s input terminals U,
V, W have been detached from the inverter. Otherwise, the inverter will be damaged.
3. For inverters that have been stored for a long time, they must be powered up every 2 years.
When supplying AC power to the inverter, use a voltage regulator to gradually raise the input
voltage to rated input voltage at least 5 hours.