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(2) Periodic inspections
Inspection item
VAT2000 appearance
VAT2000 interior
Terminal block
Cooling fan
Electrolytic capacitor
Insulation resistance
inspection
Encoder
(3) Inspection of spare VAT2000
The inspection shown in Table 8-2 must also be performed for spare VAT2000 that are left
connected but are not used in normal operation. The operation of the VAT2000 must be checked
every six months by turning the power on.
8-2 Measuring devices
As the voltage and current on the input and output sides include high harmonics, the measured value will
differ according to the measuring device. When measuring with a device for commercial frequencies,
measure with the following circuits and noted measuring devices.
8. Maintenance and Inspection
Check the state of dirt and dust on the vent or heatsink, and clean if necessary.
Check the state of dirt and dust on the PCB and inside the equipment, and
clean if necessary.
Tighten the terminal block screws if loose.
Replace the fan every three years.
Confirm that there is no liquid leaking or sheath discoloration.
Do not perform a megger test on the VAT2000. When doing a megger test on
the external circuit, disconnect all wires connected to the VAT2000.
Confirm that there is no looseness or play in the bearings or couplings.
The bearings are durable parts. This is approx. 10,000 hours at 6000rpm, and
approx. 30,000 hours at 3000rpm.They must be replaced periodically.
A
V
W
1
1
1
A
W
2
2
A
W
3
3
V
M ovin g iro n type Vo ltm e te r (
1
V
R e ctifier typ e Vo ltm e te r
2
to
W
W
E lectro dyn am om e ter type p ow e r m e ter
1
6
to
A
A
M ovin g iro n type A m m ete r
1
6
Fig. 8-1 Measurement circuit example
Table 8-2
Inspection details and work
A
V
W
2
4
4
A
W
5
5
A
W
6
6
)
(
)
(
)
8-2
M
)
(
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Troubleshooting
