Transport and Storage
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300314330_002_C7 - 05/2021 - © Leybold
Fig. 2.2 Capacitor forming
V
DC
Resistor
10 ohm
Inverter
+1
-
3 min. or more
40 min. or more
V
DC
: 360V (for 200V class)
720V (for 400V class)
Time
Voltage
Capacitor forming – What has to be observed when an inverter
was longer than 2 years on stock?
If an inverter was on stock for a time longer than two years, it should not be
connected directly to the power line. If doing so the capacitors might be per-
manently damaged.
Instead the DC bus of the inverter should be connected to a DC power
source including an cur-rent limiting resistor and the voltage should be raised
slowly. This kind of process is called forming capacitors.
In case a DC power source is not available, the DC bus of a second inverter
connected to a variable AC power supply could be used to supply the
variable DC voltage.
