Siemens 8DB10 Installation And Operating Instructions Manual page 144

Installation
Electrical operation of
switching devices
Checking interlocks
and indicators
Completing test operation
Activating
undervoltage release
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➭ Switch on all auxiliary and control voltages. The motor must start up automatically
immediately after, in order to charge the closing spring in the circuit-breaker
operating mechanism.
➭ Close and open the circuit-breaker several times. The motor charges the closing spring
automatically after every closing operation.
➭ Close and open the disconnectors and earthing switches several times.
All circuit-breakers, disconnectors and earthing switches are closed and opened,
checking the interlocks and indicators at the same time.
➭ Operate all switching devices for test to verify the perfect operation of all mechanical and
electromechanical interlocks. Do not use force.
➭ Check correct indication on position indicators at the front of the panels and
in the control room.
➭ Switch the circuit-breakers, disconnectors and earthing switches to OPEN position.
The undervoltage releases mounted in the circuit-breaker must be activated.
The circuit-breaker operating mechanism is located in the central part of the panel behind
the ON/OFF pushbuttons.
DANGER
Risk of injury by release of charged operating springs when the front plate of the operating
mechanism is removed! Bruises or cuts at the hands can be the consequence.
➭ To avoid impermissible switching operations, switch off auxiliary voltage.
➭ To discharge the spring energy store in the operating mechanism, perform the following
operations before removing the cover:
- Trip the miniature circuit-breaker.
- Actuate the OFF pushbutton.
- Actuate the ON pushbutton.
- Actuate the OFF pushbutton.
- Disconnect the control cables from the low-voltage compartment.
➭ The spring energy store indicator must show "spring not charged".
➭ Remove the circuit-breaker front cover.
Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9