ABB eVM1 Installation And Service Instructions Manual page 108

14.15 Procedure for discharging the capacitor
Whenever the circuit-breaker has to be moved or the cover removed (i.e. in case of maintenance),
the capacitor energy storage, operating at 80V DC, must be discharged afeter cutting the circuit-
breaker auxiliary supply off.
Direct contact with DC voltage on Capacitor energy storage might result in fatal personnel
Warning!
injures.
The capacitor is discharged by the IED power consumption in some minutes following disconnection
of the circuit-breaker power supply voltage.
The C Charged LED indication on the CB HMI will go off and after some time the Unit Ready LED
indication will go off, showing the capacitor voltage is below the level required for CB operation
(50V DC). Several minutes are then needed until the capacitor voltage drops to a value of less
than 15 V.
After the ready indication goes off it is possible to apply the Capacitor Fast Discharge (CFD)
device to the capacitor flying connector (refer to schematic drawings 1VCD400060) to fully discharge
the capacitor.
Fig. 99
The red LED indication on the CFD device will go off at full discharge.
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