USER`S GUIDE High Speed DC Circuit Breaker TYPE ... - Biziz

The activation magnet is mounted at the front of the
breaker and is equipped with a grounded casing.
The drive includes a self-interrupt control circuit (SUcontrol).
This circuit enables a short activation with a
minimum command duration of approximately
300ms, causes the voltage applied to the magnet to
be switched off after approximately 400ms and prevents,
during continuous operation, repeated activation
(anti-pumping) due to an existing short circuit. In
addition, the switch-in mechanism is electrically
blocked for approximately 10s after activation. This
prevents premature activation following a short circuit.
The breaker is equipped with up to ten isolated
form C auxiliary contacts (1 NO/NC each). The
auxiliary contacts are activated by the movable main
contact. They are wired to 15-pin control plugs. As
an accessory the circuit breaker can be equipped
with auxiliary switches for indication of short circuit
tripping and for the presence of the arc chute.
2. Installation and Operation
2.1 Transportation
The circuit breaker must always be transported to
the installation site properly and fully packed. The
packaging protects the device against damage and
dust; it should only be removed prior to installation.
If the packaging is damaged, the breaker and the
arc chute must be inspected for damage. Ensure
that all packaging materials have been carefully removed
prior to breaker installation.
2.2 Installation
The breakers, as delivered, are IP00 protected.
They must be installed in a dry, preferably dust-free
room. They must not be subjected to strong vibrations.
The lower and upper connections must be
connected directly to the main cables and busbars.
The breaker must only be used in an upright
operation position with the arc chute in place
and fully secured. After installation, both the arc
chute and special threaded joints must be checked
for tightness.
The safety distances as shown in the dimensional
drawings must be maintained to grounded or insulated
parts. Suitable measures must be taken to
protect personnel from arcs.
Strong, external magnetic fields, caused by
improperly located supply conductors or stray fields
from other devices, can lead to a shift of the trip setting
thresholds. This may result in premature tripping,
or no tripping at al, during low-level short circuit
current events. This has to be accounted for
when installing and operating the device with
shielding added if appropriate.
The control wires must be connected as shown in
the schematic circuit diagram [Fig.8].
The protective grounding wire must be connected at
the marked contact.
2.3 Setting the Overload Release
The adjustment of the static overload release [Fig.1]
within a specific adjustment range is made by turning
the regulating screw. This procedure requires an
SW6 hexagon wrench. The adjustment must only be
carried out after the breaker has been disconnected
from the main circuit and has been grounded. Turning
the adjustment screw clockwise decreased the
trip threshold, turning the screw counter-clockwise
increased the tripping threshold.
Adjustment is performed by aligning both the arrow
and the marking line to one line.
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