7 Routine Inspection and Maintenance
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7
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Do not perform inspection while the power is on.
◆
Before the inspection, disconnect all power supply and wait for 10 minutes to avoid
risk caused by the residual voltage in the capacitor of the drive.
Inspection
Item
Inspection Points Inspection Points Checked
General
Inspect for wastes, dirt and dust on the
surface of the AC drive.
● Check whether the AC drive is powered off.
● Use a vacuum cleaner to suck up wastes
and dust to prevent direct touching.
● Wipe surface dirt gently with a soft cloth
immersed in neutral detergent.
Cables
Inspect power cables and connections for
discoloration.
Inspect wiring insulation for aging or wear.
● Replace cracked cable.
● Replace damaged terminals.
Peripheral
devices such
as relay and
contactor
Inspect contactors and relays for excessive
noise during operation.
Inspect coils for signs of overheating such as
melted or cracked insulation. Check whether
the coil voltage is normal.
● Replace abnormal peripheral device.
Ventilation
Inspect whether ventilation and heatsink are
clogged.
Check whether the fan is damaged.
● Clean ventilation.
● Replace the fan.
Control circuit
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.
7.2.2 Insulation Test on Main Circuit
Before measuring insulation resistance with a megameter (a 500 VDC megameter is recommended), discon-
nect the main circuit from the AC drive. Do not conduct the dielectric strength test using an insulation megame-
ter. High voltage (> 500 V) test need not be performed again because it has been completed before delivery.
R S
T
U
V
W
BR
P
+
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DC 500V
Megameter
+
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MD500
Figure 7-1 Test insulation on the main circuit
The measured insulation resistance must be greater than 5 MΩ.
Before test, remove the VDR screw. For positions of VDR and EMC screws, refer to Figure 3-37 in 3 Installa-
tion and Wiring.
7.3 Replacement of Wear Parts
7.3.1 Lifetime of Wear Parts
The lifetime of fans and electrolytic DC bus capacitors is related to the operating environment and maintenance
status. Generally, the lifetime is shown as follows:
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