Star–Delta Operation - Siemens SIMODRIVE 611 Planning Manual

05.01
Note
For SIMODRIVE 611 digital and SIMODRIVE 611 universal, the master/slave
operation is realized via a speed setpoint coupling ––> also refer to the litera-
ture associated with the particular drives.
9.10 Star–delta operation
SIMODRIVE 611 main spindle modules support the operation of star/delta
motors.
At low speeds, the drive is operated in the star circuit configuration (high torque)
and at higher speeds in the delta circuit configuration (high stall torque).
Changeover is also possible during operation.
The changeover speed from star to delta operation must lie within the stall
power range for star operation (refer to the speed–torque diagram for Y/∆
operation).
Fig. 9-26
Warning
!
While changing over from Y to ∆ operation torque may not be demanded from
the 1PH motor. In this case, a minimum deadtime of 0.5 s must be taken into
consideration for contactor changeover times, safety times, de–magnetization
and magnetizing operations.
 Siemens AG 2001 All rights reserved
SIMODRIVE 611 Planning Guide (PJU) – 05.01 Edition
1
M M
X
rated Y
n
Y
∆
M
rated
n
rated Y
0
Speed–torque diagram for Y/∆ operation
9 Important Circuit Information
9.10 Star–delta operation
∆
M
M
stall Y
stall
1
X
n∆
∆
n
rated
9
n
9-285