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Delta Changeover

Delta Changeover
Delta Changeover
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Product Code : HSDT2CO & BSDT
Brand Name : GE POWER
Product Description

 Delta Changeover

 HSDT2CO & BSDT

GE POWER

The HSDT2CO Series and BSDT Series are Star Delta Timers which have
been designed specifically to meet the requirements
for starting squirrel cage motors by star-delta change over. They have a run
up time settable from 0-30 sec and give a fixed 50msec (40 to 70ms)
changeover delay time. This changeover delay prevents the overlapping
operation of star and delta contactors. This in turn prevents possible
sparking, thus protecting contactors and motors from damage. The output
is 1 NO contact each for star & delta relay for HSDT2CO series timer and 1
NO contact for BSDT series timer

Features :
Repeat accuracy better than 0.5%
Finger guards for safety
DIN rail / Screw mounting
Slim space saving construction

GE has the widest range of Power Contactor in India today (6A to 825A, AC3). To ensure trouble free and smooth operations of your
star delta starters, insist on GE make CL & CK contactors with HSDT2CO Star-Delta Timer (with 2 changeover contacts) and BSDT
Star-Delta Timer (with 1 changeover contact)

 

Operating Principle - Two changeover - HSDT2CO
Timer gets the supply as soon as switch S2 is closed. Star
contact (15/18) of the timer closes which in turn gives supply to
the star contactor K1 and the set runup time starts. At the same
time mains contactor K2 is switched on via the auxiliary
contact of star contactor K1 and then becomes self-holding
via its own auxiliary contacts. Star contact of the timer opens
at the end of run-up time, thus switching off the supply voltage
of the star contactor. The second delay starts after star
contactor opens. At the end of this delay, the delta contact
(25/28) of the timer closes, starting the delta contactor K3. The
delta contactor, thereafter remains on until power is
discontinued.

 

Operating Principle - One changeover - BSDT
Star contactor K1 closes and the set run-up time starts when
the supply voltage is applied. Mains contactor K2 is switched
on via the auxiliary contacts of star contactor K1 and then
becomes self-holding via its own auxiliary contact 13/14.
Simultaneously, auxiliary contacts 21/22 of mains contactor K2
open, thus connecting the star-delta timer and the star
contactor via its auxiliary contacts 43/44 to the supply.
Contacts 15/16 of star-delta timer open after the run-up time,
thus switching off the supply voltage of the timer and of the
star contactor. Contact 15/16 of star-delta timer remains open
for approx. 50msec and resets after that time to ensure that
star contactor K1 has opened. Delta contactor K3 has been
connected via auxiliary 22/21 of star contactor K1.

 



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