Power Considerations; Discharging Storage Unit Capacitors - ABB R-MAG Instruction Manual

6.0 POWER CONSIDERATIONS

The ED2.0 power supply recharge unit adapts any voltage within the specified range of the board
to maintain 80 V across the capacitors. The following voltage thresholds must be reached to
complete the specified operations:
1. The capacitor voltage threshold for an Open operation is 49 volts.
2. The capacitor voltage threshold for a Close-Open operation is 72.5 volts.
3. The capacitor voltage threshold for a Open-Close-Open operation is 78 volts.
Illustrations 5 and 6 are provided to indicate the states of the Ready LED, Ready and Not Ready
output contacts.
CB OPERATIONS VS AVAILABLE CAPACITOR CHARGE:
CAPACITOR CHARGE
Energy sufficient for O-CO operations Open allowed
Energy sufficient for CO operations
Energy sufficient for O operations
Energy insufficient for any operation
RECHARGE TIME
As with all energy storage devices, there is a recharge time required for operation of the breaker.
A fully charged unit will do an Open-Close-Open operation. Average values for recharge on 15
kV units are listed below. The 27 kV units require additional recharge time. The values shown are
minimums and will change as capacitor life and operation conditions vary.
Open-1.0 sec
Close-2.2 sec
Close-Open-3.4 sec
Open-Close-Open-5 sec

6.1 Discharging Storage Unit Capacitors

Make sure ED2.0 Control Power is removed before attempting to discharge the
capacitors. See paragraph below.
36
CIRCUIT BREAKER POSITION
CLOSE
Open allowed
Open allowed
Blocked in closed
position or CB
opened (depending
on dip switch setting
- I1004)
!
WARNING
OPEN
Close allowed
Close allowed
Blocked in open position
Blocked in open position