Voltage Boost - Siemens SINAMICS S120 Function Manual

3.3.1

Voltage boost

With an output frequency of 0 Hz, the V/f characteristics yield an output voltage of
0 V. The voltage boost must be entered to:
S Magnetize the induction motor.
S Maintain the load.
S Compensate for the losses (ohmic losses in the winding resistors) in the system
S Generate a breakaway/acceleration/braking torque.
The voltage boost can be increased permanently (p1310) or during acceleration
(p1311).
Fig. 3-44
Note
The voltage boost affects all V/f characteristics (p1300).
Notice
If the voltage boost value is too high, this can result in a thermal overload of the
motor winding.
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
Permanent voltage boost
V_boost perm
p1310
0
0
V_boost accelerate
1
p1311
Ramp–up active
p1199.0
Voltage boost at
acceleration
Voltage boost total
Vector V/f control (r0108.2 = 0)
Drv I_output max
r0067
+ +
Mot I_rated 0
p0305
Operating Modes
V_boost total
r1315
R_stator active
r0395
3-161