5 Maintenance and Repair
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Inspection
Item
Inspection Point Inspection Details Checked
Controller
Inspect for control components
in poor contact.
Inspect for loose terminal
screws.
Inspect for control cables with
cracked insulation.
Clear away foreign matters on the
surface of control cables and terminals.
Replace damaged or corroded control
cables.
□
5.3.2 Insulation Test on Main Circuit
Before measuring the insulation resistance with a megameter (500 VDC megameter
recommended), disconnect the main circuit from the AC drive. Do not use the insulation
resistance meter to test the insulation of the control circuit. The high voltage (> 500 V)
test is not required because it has been completed before delivery.
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5
6
7
8
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Figure 5-14 Insulation test on the main circuit
The measured insulation resistance must be greater than 5 MΩ.
Before test, remove the VDR screw. For specic locations of the VDR and safety capacitor
(EMC) jumpers to ground, see
"3.5.2 Main Circuit Terminals"
.
5.4 Replacement of Wear Parts
5.4.1 Service Life of Wear Parts
Wear parts of the AC drive include the cooling fan and lter electrolytic capacitor. Their
service life is related to the operating environment and maintenance. The service life of
the two components under general conditions is listed below.
Component Service Life
[1]
Cooling fan ≥ 5 years
Electrolytic capacitor ≥ 5 years
[1] The standard service life indicates the lifetime when the components are used in the following
conditions. You can determine when to replace these parts according to the actual operating
time.
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