CSDU Star/Delta Connecting for the protective start of the motor
The Condor Pressure Control GmbH CSDU Star/delta
connection offers, in due consideration of the relevant
standards, the possibility of economically operating motors
with a switching capacity greater than 4 kW using public mains
With this 2-stage starter the inrush current (star circuit) is
reduced by 1/3 of the height to be expected when starting the
motor directly. The torque is equally reduced during start-up
During the start-up phase (1 – 32 seconds), a special
change-over relay with a contact switching time of 50 ms,
guarantees reliable change over from star to delta operation.
During continuous operation, all motors connected to the
Star/delta connection are protected by a manual motor
starter with thermal and magnetic trip.
Standard executions contain a manual motor starter and an
on / off switch for the control circuit. Complete star/delta
connections additionally have a main circuit-breaker with
enclosure locking, an emergency button, an hour meter and
an operating LED.
Star/delta connections as standard-version with an additional
transformer are used, if there is no neutral leader connected.
CSDU-M Star/Delta Connecting With Pressure Switch MDR 3
The Star-delta connection is used in order to reduce high
currents when starting electric motors. With this 2-stage
starter the inrush current (star circuit) is reduced by 1/3 of
the height to be expected when starting the motor directly.
The Condor Pressure Control CSDU offers the possibility to
operate a motor until 7.5 kW using public supply networks.
This control can be connected to a power supply without
The pressure switch MDR 3 included in the scope
of supply replaces a contactor and can be
delivered in different options.
The Condor Pressure Control star/delta with pressure with
MDR 3 is registered at the German Patent and Trademark
Office as utility model number 20 2015 104 249 .
For the star/delta connection special switches or contactor
combinations are used. The pressure switch MDR 3 that has
to be installed separately to the compressor of the new
Condor Pressure Control star/delta CSDU-M serves as a
so-called main contactor for this type of control. Thereby the
contactor is not necessary anymore.
The applied pressure switch MDR 3 can be used in different
pressure ranges and has a wide variety of optional accessories
(e.g. unloader valves, on-/off switch, phase sequence
monitoring and phase drop monitoring, hourmeter kit, etc.).
Both of the star/delta contactors as well as the star/delta
change-over relays and the motor connecting clamps are built
in a compact housing of the CSDU-M.