Vdc Control - Siemens SINAMICS S120 Function Manual

3.3.3

Vdc control

Description
Vdc_max
Vdc_max on_level
r1282
-
Vdc_act
r0070
+
Vdc_min on_level
r1286
Vdc_act +
r0070
-
Vdc_min
Fig. 3-48 Vdc control V/f
The "Vdc control" function can be activated using the appropriate measures if an
overvoltage or undervoltage is present in the DC link.
S Overvoltage in the DC link
– Typical cause
The drive is operating in regenerative mode and is supplying too much
energy to the DC link.
– Remedy
Reduce the regenerative torque to maintain the DC link voltage within
permissible limits.
S Undervoltage in the DC link
– Typical cause
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
Vdc_ctrl Tn
p1291
Vdc_ctrl Kp
p1290
Vdc_ctrl config
p1280
1.3
0
0.2
Vdc_max dyn_factor
p1283
Vdc_ctrl Tn
p1291
Vdc_ctrl Kp
p1290
Vdc_ctrl config
p1280
0
2.3
0.1
Vdc_min dyn_factor
p1287
Vector V/f control (r0108.2 = 0)
Vdc_ctrl t_deriv.
p1292
Vdc controller output limit
p1293
0
Vdc_ctrl output
Vdc_ctrl t_deriv.
p1292
0
–Vdc controller output limit
p1293
Operating Modes
Control ZSW 1
1
r0056
r0056.14
0
r1298
Ramp-function
generator
V/f limiting
Control ZSW 1
1
r0056
r0056.15
0
3-165