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6.3. Circuit-breaker closing and opening
operations
Circuit-breaker operation can be either manual or electrical
(fig. 6 - fig. 7).
a) Manual closing spring loading for eVD4 circuit-
breakers for UniGear switchgear and PowerCube units
(fig. 7a)
Repeatedly operate the loading lever (2) (maximum rotation
angle of the lever: about 90°) until the yellow indicator (7)
appears.
The maximum forces which can normally be applied to the
lever are <150 N for the EL1operating mechanism, <200 N for
the EL2 operating mechanism and <250 N for the EL3
operating mechanism.
For the type of operating mechanism, please refer to the
rating plate in fig. 1.
b) Electric spring loading operation
On request, the circuit-breaker can be fitted with a geared
motor for automatic closing spring loading.
The geared motor automatically reloads the spring after each
closing operation until the yellow indicator (7) appears.
If the power is cut off during loading, the geared motor stops
and automatically starts reloading the springs again when the
power returns.
In any case, it is always possible to complete the loading
operation manually.
Fig. 7a
42
42
c) Circuit-breaker closing
c1 Circuit-breaker closing from the front
The operation can only be carried out with the closing spring
completely loaded.
For manual closing, press the button (5 - fig. 6a).
When there is a shunt closing release, the operation can also
be carried out remotely by means of a special control circuit.
Closing having taken place is indicated by the signalling
device (6 - fig. 6a).
c2 Closing the circuit-breaker by means of HMI
The operation can only be carried out with the circuit-breaker
open and the closing spring fully loaded and by means of the
shunt closing release.
Nota
Make sure that the control mode is set to "Local"
(the LED alongside the letter L on button
otherwise press the control mode selection button until the
LED alongside L comes on.
a) Select the Single Line Diagram (SLD) section
by means of the SLD button
display shows the part dedicated to the SLD (it turns black)
b) When the SLD is selected, use the "up" and "down" arrow
buttons to select the circuit-breaker symbol.
≈ 90°
7
2
must be on),
; the top bar on the
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