Spare Parts; Capacitor Life Curve - Hitachi L100 Instruction Manual

6–10

Spare parts

Capacitor Life Curve

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Maintenance and Inspection
We recommend that you stock spare parts to reduce down time, which include:
Part description
Cooling fan FAN
Case CV
The DC bus inside the inverter uses a large capacitor as shown in the diagram below. The
capacitor handles high voltage and current as it smooths the power for use by the
inverter. So, any degradation of the capacitor will affect the performance of the inverter.
Variable-frequency Drive
Power
Input
High-voltage
Converter
L1
L2
Rectifier
L3
Capacitor life is reduced in higher ambient temperatures, as the graph below demon-
strates. Be sure to keep the ambient temperature at acceptable levels, and perform
maintenance inspections on the fan, heat sink, and other components. If the inverter is
installed on a cabinet, the ambient temperature is the temperature inside the cabinet.
Ambient temperature, °C
Capacitor Life Curve
Quantity
Symbol
Used
1
1
Inverter
DC Bus +
+
–
40
30
20
10
0
-10
1 2 3 4 5
Notes
Spare
1 022NF, 037LF, 015HF to
075HF
1 Front case
Key cover
Case
Bottom cover
Motor
U
V
W
Operation for 12 hours / day
6 7 8 9 10
Years