Hitachi L100 Spare parts, Capacitor Life Curve

6–11

L100 Inverter

Spare parts

We recommend that you stock spare parts to reduce down time, including these parts:

Part description		Symbol	Quantity			Notes
			Used	Spare
Cooling fan	FAN		1	1	022NF, 037LF, 015HF to
					075HF
Case	CV		1	1	•	Front case
					•	Key cover
					•	Case
					•	Bottom cover

Troubleshooting Maintenance and

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			Variable-frequency Drive
Input
	Con-		Internal				Inverter		Motor
L1			DC Bus		+			U/T1
L2
	Rectifier			+
								V/T2
L3
						–		W/T3
		Capacitor

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 40		Operation for 12 hours/day
	30
Capacitor Life Curve	20

10

0

-10 Years

1 2 3 4 5 6 7 8 9 10