Siemens 3AH4, Operating Instructions Manual

Page: 51 / 66

Operation
9229 9862 176 0D 51
2013-08-28
The adapter (50.6) of the hand crank (50.) is designed in such a way that the hand
crank becomes uncoupled when the motor supply voltage returns.
Closing
Provided there is no lock-out due to a mechanical locking device, send the closing
command via the CLOSE pushbutton (53.) or the corresponding command element
until the vacuum circuit-breaker is closed and shows and signals the CLOSED posi-
tion.
Change of the position indicator (59.):
After switching on and possibly releasing the CLOSE pushbutton (53.), the closing
spring (62.) is immediately automatically charged by the motor and the indicator
“Closing spring charged” (55.) becomes visible.
Change of the spring state indicator (55.):
Opening
The opening spring (64) is charged during the closing operation.
To open, send the opening command via the OPEN pushbutton (54.) or the corre-
sponding command element until the vacuum circuit-breaker is open and shows and
signals the OPEN switching position.
Change of the switching position indicator (59.) after electrical opening:
The spring state indicator (55.) does not change.
Discharging the closing spring
To discharge the closing spring:
• the supply voltage must be deactivated
• the vacuum circuit-breaker must be closed manually (see “Closing” on page 51)
and then
• opened manually (see “Opening” on page 51).

OPEN CLOSED
 
Charged Discharged Charged
Note
If an undervoltage release 3AX1103… is fitted, it must be connected to the control
voltage for switching operations (mechanical or electrical), as otherwise closing
is not possible.

CLOSED OPEN