Siemens SINAMICS S120 Function Manual page 131

Description of Vdc_max control
V
controller active
dc
Fig. 3-36
The switch-in level for Vdc_max control (r1242) is calculated as follows:
S Automatic detection of ON level deactivated (p1254 = 0)
r1242 = 1.15 * p0210 (device supply voltage, DC link)
S Automatic detection of ON level activated (p1254 = 1)
r1242 = Vdc_max -- 50 V (Vdc_max: overvoltage threshold of the Motor
Module)
Function diagram overview (see List Manual)
S 6220
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition
[V]
V
dc
1
0
|n|
I
qsetp
0 A
Switching Vdc_max control on/off
Vdc_max controller and Vdc_min controller
Switch- -on level
--{}--n
act
--{}--n
setp
I
= Torque--generating current setpoint
qsetp
Operating Modes
Vector control
t
t
t
3-131