Siemens SIMOCODE pro System Manual

Motor control
SIMOCODE pro
GWA 4NEB 631 6050-22 DS 03
4-31
Notice
If the current measuring module is switched to delta (normal case), a
current which is 1/√ 3 times smaller must be set for the star-delta starter
control function.
Example: I
n
= 100 A I
s
= I
n
x 1/√ 3
I
s
= 100 A x 1/√ 3 = 57.7 A
Current to be set I
s
= 57.7 A
Change-over pause
The switching time from star to delta can be extended by the change-over
pause.
Reason: For motors with a high ratio between starting current and rated
current, the mains voltage plus motor EMF might lead to a very high delta
starting current if the change-over pause is too short. The motor EMF
decreases if the pause is longer.
Schematic
Fig. 4-16: Schematic of the "Direct starter" control function, "Protection/Control" function block
Control commands
Auxiliary control inputs
Contactor controls
Displays
Status
QE1
QE2
FB ON*
QLA
QLE>
QLS
OFF
ON >
OFF
ON >
Protection/Control
Feedback time
Execution time
Non-maintained
Load type
(ON)
(OFF)
(Fault)
QE3
Change-over pause
Max.
star time
Transformer
mounted
*Feedback ON
Star-delta starter
Motor protection
Change-over pause
active
Star contactor
Delta contactor
Network contactor
Extended control
Separate failsafe
function from
command mode
control function

Siemens SIMOCODE pro Specifications

General

Brand	Siemens
Model	SIMOCODE pro
Category	Control Unit
Language	English