Opening And Closing Procedure; Autoreclosing Sequence; Control Module; Functions Of The Control Module - ABB VM1 Installation And Service Instructions Manual

7.3. Opening and closing procedure

(Refer to figure 10)
The opening and closing processes are initiated either by
remote control via closing contacts or locally by manual
operation of push-buttons
In the closing process, the armature motion acts directly via
the lever shaft (8) on the moving contact until the vacuum
interrupter contacts meet.
In the full motion sequence, the spring arrangement (6) is
tensioned to 100% and the necessary contact force thus
applied. The available overtravel is greater than the maximum
contact burn-off throughout the life of the vacuum interrupter.

7.4. Autoreclosing sequence

The operating mechanism is SUITABLE for autoreclosing,
and with the short recharging time of the storage capacitor
it is also suitable for multi-shot autoreclosing.
Thanks to the short duration of capacitor recharging,
the drive is suitable for multiple reclosing operations with
O-0.3s-CO-3min-CO cycle.

7.5. Control module

The control module is available in the full option version.

7.6. Functions of the control module

All the conditions for controlling the opening and closing
commands given to the magnetic actuator are managed by
a microprocessor:
• the power supply voltage must be applied to the AC/DC
converter.
• the capacitor must be sufficiently charged for the next
operation:
Circuit-breaker position
Open
Close
• the closing coil can only be activated when the circuit-
breaker is open
• the opening coil can only be activated when the circuit-
breaker is closed
• closing is disabled when an opening command is active at
the same time
operations
Close and open
Opening
• de-activation of the opening or closing coil takes place
when the relative limit position has been reached.
• WRONG POSITION (auto trip) function: if the final CLOSED
(or OPEN) position is not reached within 70 ms during a
closing (or opening) operation, an opening operation is
immediately started to guarantee reaching a defined safe
position in any case.
• The anti-pumping function ensures that only one closing-
opening cycle is carried out when a closing command
followed by an opening command is active. The active
closing command must be cancelled and reset for the next
closing operation.
• Activation of the input for the closing command can be
locked by means of an external locking signal.
• The input for the "lock on closing" command must be
energised to be able to close the circuit-breaker (without
power it inhibits closing).
• Undervoltage function: controls circuit-breaker opening
if the voltage applied drops below the limit of tolerance
(established by the Standards).
The rated voltage value to be monitored is set in the factory
in conformity with the order specifications.
To prevent the function intervening when the voltage drops
below the specified level (e.g. in the case of motor starting),
it is possible to set a trip time (see Fig. 8).
If no voltage is applied to the undervoltage function input, it
is impossible to close the circuit-breaker.
The undervoltage function can be disabled.
In this case, it is possible to open and close the circuit-
breaker without applying voltage to the input of the function.
It is also possible to select either the circuit-breaker lock in
the open state or permission to reclose the circuit-breaker
after an opening operation for undervoltage.
• Monitoring function of the actuator closing and opening coil.
This function serves to monitor the continuity of the closing
and opening coils of the magnetic actuator to detect any
faults.
If a fault is detected, the luminous "READY" signal on
front of the circuit-breaker turns off and the "READY/NOT
READY" signalling contacts are activated.
• Additional safety opening command function.
The second input of the control module for the opening
function is designed so that an opening command is carried
out directly even in the case of a fault in the microprocessor.
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