Siemens 8DA10 Series Installation And Operating Instructions Manual page 19

Mechanical interlocking
Holding the control gate on the left
Three-position disconnector can be closed or
opened
READY-TO-EARTH function is blocked
Electrical interlocking
861-9601.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • Revision 11
Operating mechanism for three-position disconnector
The three-position disconnector is operated from the switchgear front.
• Auxiliary switch
- Every operating mechanism is equipped with an auxiliary switch to indicate the switch
position.
• Motor operating mechanism
- Remote operation (standard)
- Local operation (option)
- Manual operation possible by operating lever
• Wiring
- Auxiliary switches and motor operating mechanisms are wired to terminal strips in the low-
voltage compartment.
Interlocking between three-position disconnector and circuit-breaker:
• If the circuit-breaker is in OPEN position, the three-position disconnector can be closed or
opened. If one of the actuating openings of the three-position disconnector is opened, the
circuit-breaker cannot be operated.
• If the circuit-breaker is in CLOSED position, no operations are possible with the three-
position disconnector.
Inserted operating lever
• If the operating lever is inserted, the circuit-breaker cannot be closed or opened.
Operation of the control gate
• The control gate can only be operated if the interrogation lever is pushed downwards.
• The corresponding operating shafts are only released at the control board after having
operated the control gate.
• The interrogation lever can only be operated if the circuit-breaker is open.
Locking device of the switching gate
The locking device of the switching gate of the three-position disconnector can be padlocked
in all three switch positions.
Control gate in the center
No switching operation possible
DISCONNECTING and READY-TO-EARTH functions
are blocked
For information about the electrical interlocks, see the supplied circuit diagrams.
Holding the control gate on the right
Ready-to-earth/earthing is possible
DISCONNECTING function is blocked
Description
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