Spare Parts; Capacitor Life Curve - Hitachi SJ100 Instruction Manual

Spare parts

We recommend that you stock spare parts to reduce down time, including these parts:
Part description
Cooling fan
Case

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.
Power
Input
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
Symbol
Used
FAN 1
CV 1
Variable-frequency Drive
Internal
DC Bus
+
+
–
Capacitor
Capacitor Life Curve
40
30
20
10
0
-10
1 2 3 4
SJ100 Inverter
Quantity
Spare
1 022NF, 030HF, 037LF,
015HF to 075HF
1 •
Front case
•
Key cover
•
Case
•
Bottom cover
Inverter
U/T1
V/T2
W/T3
Operation for 12 hours/day
5 6 7 8 9
6–11
Notes
Motor
Years
10