ABB VD4G-25 Installation And Operating Instructions Manual page 24

V D 4 G I N S TA L L AT I O N A N D O P E R AT I N G I N S T R U C T I O N S
24
—
6. Instructions for circuit-breaker operation
6.2. Operating and signaling
VD4G circuit-breakers for UniGear switchgear and
PowerCube modules (fig. 6)
6.3. Circuit-breaker closing and
The mechanical operating mechanism can be
manually or electrically closed, opened and loaded
(fig. 6 - fig. 7).
a) Manual loading of closing spring for VD4G
circuit-breakers for UniGear switchgear (fig. 7a)
Repeatedly operate the loading lever (2) (the lever's
maximum angle of rotation is about 90°) until the
yellow indicator appears (7).
Maximum force that can normally be applied to the
lever: <200 N for operating mechanism EL2.
Operating mechanisms type EL1 Twin and EL2 Twin
are used for circuit-breakers with 40 kA breaking
capacity. Make sure the additional lever (1) is fully
inserted when loading in the manual mode, as
indicated in fig. 7b. In this way, the maximum force
applied is < 200 N.
The type of operating mechanism is indicated on
the rating plate of fig. 1
b) Electrical spring loading operation
On request, the circuit-breaker can be fitted with
the following accessories for electrical operation:
• gearmotor for automatic loading of closing spring
• shunt closing release
• shunt opening release.
The gearmotor automatically reloads the spring
after each closing operation until the yellow
indicator appears (7).
If there is a power failure during the loading
operation, the gearmotor stops and automatically
continues to load the spring once the power returns.
However, it is always possible to complete the
loading operation in the manual mode.
components
opening operations
c) Circuit-breaker closing
This operation can only be performed when the
closing spring is fully loaded.
Press the pushbutton (5 - fig. 6) to close the circuit-
breaker in the manual mode.
When there is a shunt closing release, the operation
can also be carried out in the remote mode by
means of the special control circuit. Effective
closing is signaled by the indicator (6 - fig. 6).
d) Circuit-breaker opening
Press the pushbutton (4 - fig. 6) to open the circuit-
breaker in the manual mode.
When there is a shunt opening release, the operation
can also be carried out in the remote mode by
means of the special control circuit. Effective
opening is signalled by the indicator (6 - fig. 6).