Chapter 7 Maintenance
87
EV1000 Series General Purpose Variable Speed Drive User Manual
General Inspection:
1. Whether screws of control terminals are loose.
If so, tighten them with a screwdriver;
2. Whether the main circuit terminals are properly
connected; whether the mains cables are over
heated;
3. Whether the power cables and control cables
are damaged, check especially for any wear on
the cable insulation
4. Whether the insulating tapes around the cable
lugs are stripped;
5. Clean the dust on PCBs and air ducts with a
vacuum cleaner;
6. For drives that have been stored for a long time,
it must be powered on every 2 years. When
supplying AC power to the drive, use a voltage
regulator to raise the input voltage to rated input
voltage gradually. The drive should be powered
for 5 hours without driving a motor load.
7. Before performing insulation tests, all main
circuit input/output terminals should be
short-circuited with conductors. Then proceed
insulation test to the ground. Insulation test of
single main circuit terminal to ground is prohibited,
The drive can be damaged by such a test. Please
use a 500V Mega-Ohm-Meter.
8. If performing insulation test to the motor, be
sure to disconnect the cables between the drive
and it. Otherwise, the drive might be damaged.
Hint
：
Dielectric test of the drive has already been done in
the factory. It is not necessary for the user to do
dielectric test again in order to avoid potential damage
of its internal components.
7.3 Replacing of Easily-worn
Parts
The easily-worn parts of the drive are cooling fan
and electrolytic capacitor, whose life has close
relation with the environment and maintenance.
Refer to the table below.
Part
Life
Fan
30
～
40 thousand hours
Electrolytic capacitor
40
～
50 thousand hours
Relay TA/TB/TC
About 100,000 times
You can decide the time when the components
should be replaced according to their service
time.
1. Cooling fan
Possible cause of damages: wear of the bearing,
aging of the fan vanes.
Criteria:
After the drive is switched off, check if abnormal
conditions such as crack exists on fan vanes and
other parts. When the drive is switched on, check
if drive running is normal, and check if there is
any abnormal vibration.
2. Electrolytic capacitors
Possible cause of damages: high ambient
temperature, aging of electrolyte and large pulse
current induced by rapid changing loads.
Criteria: Check if frequent over-current or
over-voltage failures occur during drive start-up
with load. Check if there is any leakage of liquids
(electrolytes). Check if the safety valve protrudes.
Measure static capacitance and insulation
resistance.
3
．
Relay TA/TB/TC
Possible cause of damages: erosion, frequent
operation.
Criteria: ON/OFF malfunction.
7.4 Storage of the Drive
The following points must be followed for the
temporary and long-term storage of drive:
1. Store in locations free of high temperature,
humidity, dust, metal powder, and with good
ventilation.
艾默生变频器、艾默生CT高级授权代理商--广州盟雄 020-85543394 qq:2294731312
