Hitachi L2002 - Manual (Page 223)

L200
2
Inverter
T
roub
leshooting
and Maintenance
6–11
Spare parts
We recommend that you stock spare parts to reduce down time, including these parts:
Capacitor Life Curve
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.
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.
Part description Symbol
Quantity
Notes
Used Spare
Cooling fan FAN 1 1 015NF, 022NF, 037LF,
015HF to 075HF
Case CV 1 1 • Front case
• Key cover
• Case
• Bottom cover
Power
Input
Inverter
L1
Motor
L2
L3
Rectifier
Variable-frequency Drive
Internal
DC Bus
+
+
–
U/T1
V/T2
W/T3
Converter
Capacitor
Ambient
temperature, °C
Years
Capacitor Life Curve
Operation for 12 hours/day 40
30
20
10
0
-10
1 2 3 4 5 6 7 8 9 10
50