8
05.01
8.10 Star–delta mode
8-300
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
!
Danger
If synchronous motors are operated with speeds that require a VPM, the
star–delta contactors must be protected using a safe power supply so that in
case of fault, this contactor remains reliably switched on until the motor has
reached uncritical speeds (EMC voltage)!
This must be proved in a risk evaluation of the machine/plant constructor!
Connection diagram for Y/D changeover, 1PH Motor with SINUMERIK 840D
SIMODRIVE 611
V2U2
W2 PE
K
x
1)
1PH
Y/D
K1 K2
U2
V1 W1
V2
W2 U2 V2 W2
U1
Notes:
1) A safe standstill is not guaranteed by just opening K1 and K2.
This is the reason that for safety–related reasons, contactor K
x
should be used to provide electrical isolation. This contactor may only be opened/closed in the no–current
condition, i.e. the pulse enable must be withdrawn 40 ms before the contactor is opened (de–energized).
Refer to Sections 9.4.2 and 9.7. Circuit example =10.
Fig. 8-28 Connection diagram for Y/∆ changeover with SIMODRIVE 611
The connection diagram for Y/∆ changeover 611 universal HRS can be engine-
ered, based on the previous examples. For a description of the function, refer to
the separate Configuration Manuals and documentation for SIMODRIVE 611
universal.
Connection
example
8 Im
ortant Circuit Information 05.08
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