ABB ZX0 Manual For Installation And Operation page 48

Three position disconnector mechanism
On emergency manual operation, the interlocks are
ineffective.
The circuit-breaker must always be in the OFF position
before the three position disconnector is operated.
Always perform all switching operations up to the stop.
The switch position of the three position disconnector is indicated
mechanically (12 in figure 4.1.2.3.1.3).
− Plug the crank into the shaft of the three position discon-
nector mechanism (13 in figure 4.1.2.3.1.3).
Operation of the three position disconnector
When using the crank, ensure that pressure is continuously ap-
plied via the mushroom handle at the end of the crank throughout
the complete switching operation.
In panel width 400 mm, approx. 17 turns of the crank are required
from the OFF position of the three position disconnector to the
ON position of the earthing switch or disconnector and vice versa,
and in panel width 600 mm approx. 24 turns of the crank are re-
quired.
Earthing switch OFF ð ON
− Turn the operating crank counter-clockwise until the stop is
reached to switch the earthing switch on.
− Withdraw the operating crank.
Disconnector OFF ð ON
− Turn the operating crank clockwise until the stop is reached
to switch the disconnector on.
− Withdraw the operating crank.
Fig. 4.1.2.3.1.2: Crank for emergency manual operation of motor operated
mechanism 1
48 | Manual ZX0 HB 600 en - Revision 05
Earthing switch ON ð OFF ð Disconnector ON
− Turn the operating crank clockwise until the stop is
reached.
− The three position switch is then in the OFF position.
− Withdraw the operating crank and refit it. Turn the operat-
ing crank clockwise until the stop is reached.
− Withdraw the operating crank.
Disconnector ON ð OFF ð Earthing switch ON
− Turn the operating crank counter-clockwise until the stop is
reached.
− The three position switch is then in the OFF position.
− Withdraw the operating crank and refit it. Turn the operat-
ing crank counter-clockwise until the stop is reached.
− Withdraw the operating crank.
Fig. 4.1.2.3.1.3: Three position disconnector mechanism, motor operated
mechanism 1, with crank for emergency manual operation fitted
12 Switch position indicator
13 Operating crank
13
12