Instruction manual

KRB-5377
30
z Motor charging
When the charge indicator (Fig. 23
◯
1
) changes to “DISCHARGED” while the specified operation voltage is applied to the control
circuit terminals
□
02
and
□
22
, the charging motor is activated to start charging the closing springs. Upon completion of the charging
operation, the charge indicator shows “CHARGED” and the charging motor is automatically deactivated. The time required for the
motor charging operation depends on the operation voltage or the ACB types, but does not exceed 10 seconds.
4-1-2. Closing operation
The ACB closing operation is not permitted unless all of the following conditions are met.
1) The charge indicator (Fig. 23
◯
1
) shows "CHARGED".
2) The position indicator (Fig. 23
◯
3
) shows "CONN.", "TEST" or "ISOLATED" (a halfway position not permitted).
3) The draw-out handle is not inserted in the draw-out handle insertion hole(Fig. 23
◯
5
) .
4) The OFF button (Fig. 23
◯
6
) is not locked with the lock-in-OFF plate (Fig. 23
◯
7
).
5) The specified voltage is supplied to the undervoltage trip device .
The control power of the overcurrent release (OCR) must be supplied before closing operation in order that the internal program can
be started. If the OCR trips open directly after the control power is supplied to the OCR, operation indication may be incorrect.
z Manual closing
Open the ON-OFF button cover (Fig. 23
◯
8
) and press the ON button (Fig. 23
◯
9
). The ACB will be closed with a sound. The ON-
OFF indicator (Fig. 23
◯
10
) shows "ON" and the charge indicator (Fig. 23
◯
1
) shows "DISCHARGED".
z Electrical closing
Press the ON switch shown in Fig. 17,19. The latch release coil (LRC) (Fig. 17,19) will be excited and the ACB is closed with a
sound. The ON-OFF indicator (Fig. 23
◯
10
) shows "ON", the charge indicator (Fig. 23
◯
1
) shows "DISCHARGED", and the
charging motor starts charging the closing springs.
4-1-3. Opening operation
z Manual opening
Open the ON-OFF button cover (Fig. 23
◯
8
) and press the OFF button (Fig. 23
◯
16
). The ACB will trip open with a sound. The ON-
OFF indicator (Fig. 23
◯
10
) shows "OFF".
z Electrical opening
Press the OFF switch shown in Fig. 17,19. The shunt trip device (SHT) or the fixed type undervoltage trip device (Fig. 17,19) will
be excited so that the ACB trips open with a sound. The ON-OFF indicator (Fig. 23
◯
10
) shows "OFF".
4-1-4. Motion of trip indication and spring charge indication switches
The trip indication and spring charge indication switches provide the breaker status as shown in Table 16.
Table 17 Motion of trip indication and spring charge indication switches
Contact output
State
Closing spring ACB open
Type of OCR Operation
Terminal No.
See Fig. 17
Charged Discharged
ACB closed
Not ready to close * Ready to close *
Trip
□
05
,
□
17
No change No change OFF ON OFF
All
Spring charge
□
05
,
□
27
ON OFF No change No change No change
* “Ready to close” means that all of the following conditions are met:
1. The closing springs are charged.
2. Opening operation is complete (At least 40 ms has elapsed after trip signal was produced).
3. The OFF button is released.
4. The specified voltage is applied to the undervoltage trip device (if equipped).