M ED I U M VO LTAG E P R O D U C T S
15
15
•
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).
7.1.4.2. Additional functions of the control module
- full option version
When the “FULL OPTION” control module is
requested, the following functions are also
available:
•
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 par. 7.1.7).
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 (see par. 7.1.7).
•
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.
7.1.2. Opening and closing operations
The opening and closing operations can either be
remotely controlled by means of the special inputs
provided in the control module, or locally by
pressing the pushbuttons (8 - 9) (fig. 4).
During the operations, the moving armature of
the actuator acts directly on the moving contact
by means of the kinematics (8a) (fig. 7).
7.1.3. Reclosing function
Thanks to the short duration of capacitor
recharging, the drive is suitable for multiple
reclosing operations with O-0,3s-CO-3min-CO
cycle.
7.1.4. Control module
The control module is available in the standard
version and in the full option version.
7.1.4.1. Functions of the control module - standard
version
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
Operations
Open
Closing and Opening
Closed
Opening
•
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
•
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.
Summary of Contents for VM1
Page 59: ...MEDIUM VOLTAGE PRODUCTS 59 59 ...
