6.2 Periodic Inspection
YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions 165
Periodic Inspection &
Maintenance
6
■ Power Cell
Check the following items.
• Check for discoloration indicating burn marks.
• Check for leakage from the smoothing capacitor.
• Check for protrusion or expansion of the safety valves.
• Check for loose bolts in the input terminals (L1, L2, L3) and the output terminals (T1, T2).
If there are any, retighten them.
• Check if the optical fiber cable connector is loose.
If it is, re-insert it.
• Check for loose screws and bolts inside Power Cells.
If there are any, retighten them.
• Check the main circuit fuse and control fuse on the board for discoloration and partial looseness.
• Check for accumulation of dirt and dust on the heat sink.
If you find any, remove it with dried compressed air at 39.2 × 10
4
to 58.8 × 10
4
Pa (4 to 6 kgxcm
2
).
■
Air Filter
If the air filter is soiled or clogged with dirt and dust, the cooling capacity of the drive will be degraded, resulting in
abnormal temperature rise. Check the air filter for dirt and dust at each periodic inspection, and clean it with neutral
detergent every six months.
■
Board
Check the following items.
• Check the board for abnormal odors or discoloration.
• Check for loose screws or connectors.
If there are any, retighten them.
■
Cooling Fan
Check the following items.
• Check for abnormal vibration and noise.
• Check for loose installation bolts.
If there are any, retighten them.
• Insulation resistance of the cooling fan’s motor
Use a 500 V Megger insulation resistance tester. The measured insulation resistance must be 10 MΩ or more.
• Cooling fan motor bearing
The service life of the bearing is approximately 40,000 hours.
Figure 6.1
Figure 6.1 Internal Layout Diagram (Drive: 6-kV Class, 1600 kVA)
A – Cooling fan D – Main circuit output terminals
B – Power Cells E – Transformer
C – Control circuit terminals F – Main circuit input terminals
VVU
T S R
W
Transformer panel Power Cell panel Control panel
F
A
B
C
D
E
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