ABB AS09-30-10S-25 [102/202] Star delta starters protected by overload relays
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ABB AS09-30-10S-25 [102/202] Star delta starters protected by overload relays

ABB ASL09-30-10-81 [102/202] Star delta starters protected by overload relays
5/26 | ABB Motor protection and control - short form catalog
Star-delta starters protected by overload relays
With AF contactors - Open type version in kit form
Application
Star-delta starting is the most common method to reduce the starting current of a motor.
This system can be used on all the squirrel cage motors, which are normally used in delta connection. In this
type of starting, it is recommended to choose motors having high starting torque i.e. much higher than the
resistive torque in order to reach sufficient high speed when the motor is connected in star.
I
/
I
n
T
/
T
n
6
5
4
3
2
1
0
7
20 40 60 10080
T
r
I
T
I
T∆
(delta)
(motor)
(star)
(motor)
(resistive torque)
Motor speed (%)
When starting:
– Inrush current is reduced to a third of direct starting
current
– Motor torque is reduced to a third or even less of direct
starting torque.
Transient current is generated when switching from star to
delta connection.
During the initial starting phase ("star" connection), the
resistive torque of the driven load must remain, irrespective
of speed, less than the "star" motor torque until "star-delta"
switching occurs.
This starting mode is therefore ideal for machines having
low starting torque such as pumps, centrifugal compres-
sors, wood-working machines...
I = current
T = torque
In = nominal current
Tn = nominal torque
Precaution
– Motor nominal voltage in delta connection must be equal to that of the mains. Example: a motor for 400V
star-delta starting must be designed for 400V in "delta" connection. Its usual designation is "400V /
690V motor". The motor must be constructed with 6 terminal windings
– In order to prevent a high current peak, at least 85% of nominal speed must be reached before switching
from star to delta
Sequence
Starting is a three-stage process:
1st stage: "Star" connection - Press the "On" button on the control circuit to close the KM2 "Star" contactor.
The KM1 "line" contactor then closes and the motor starts. Countdown of programmed starting time (6 to
10s) then begins.
2nd stage: "Star" to "Delta" switching - when programmed starting time is over, the KM2 "Star" contactor opens.
3rd stage: "Delta" connection - Thanks to AF contactors, a transition time (or dwelling time) of 50ms is
already integrated between the opening of the "star" contactor and closing of the "delta" contactor.
Conclusion: An on-delay timer without dwelling time (e.g.: CT-ERS.21S or TEF4-ON) is enough to count-
down the programmed starting time (6 to 10s) during "Star connection". The use of a star-delta timer includ-
ing a dwelling time is not permitted.
Main Technical Data
Standards IEC 60947-4-1 / EN 60947-4-1
Rated operational voltage Ue max. 690 V - 50/60 Hz
Rated insulation voltage Ui
acc. to IEC 60947-4-1 690 V
acc. to UL / CSA 600 V
Ambient air temperature
Close to the device ≤ 60 °C (TF42: 38 A above ≤ 50 °C)
Degree of protection IP20
Switching frequency Refer to "Switching frequency diagrams" page
Mounting positions
Pos. 1
1SFC101104V0001
1SFC101103V0001
AF140-30-11 + AF140-30-11 +
AF140-30-11 + BEY140-4 + VM19
+ EF146
AF16-30-10 + AF16-30-10 +
AF09-30-10 + BEY16-4 + VEM4 +
TF42
Y
Δ
L
1SBC101956S0201
5
Time) Time) Time)

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