Vdc Control - Siemens Sinamics S120 Function Manual

Servo control

3.14 Vdc control

● r1986 PolID saturation curve 2
● r1987 PolID trigger curve
● p1990 Determine encoder adjustment commutation angle offset
● p1991[0...n] Motor changeover commutation angle correction
● r1992 Pole ID diagnostics
● p1993[0...n] Pole ID current, motion based
● p1994[0...n] Pole ID rise time, motion based
● p1995[0...n] Pole ID gain, motion based
● p1996[0...n] Pole ID integral time, motion based
● p1997[0...n] Pole ID smoothing time, motion based
● p3090[0...n] Pole ID elasticity-based configuration
● p3091[0...n] Pole ID elasticity-based ramp time
● p3092[0...n] Pole ID elasticity-based wait time
● p3093[0...n] Pole ID elasticity-based measuring operation number
● p3094[0...n] Pole ID elasticity-based deflection expected
● p3095[0...n] Pole ID elasticity-based deflection permissible
● p3096[0...n] Pole ID elasticity-based current
● r3097.0...31 BO: Pole ID elasticity-based status
3.14 Vdc control
Description
The Vdc control monitors the DC voltage in the DC link for overvoltage and undervoltage. If
an overvoltage or undervoltage is identified in the DC link line-up, a subsequent response
can be set with the Vdc control via p1240.
The torque limits of the motors for which the Vdc controller is active can be affected if
discrepancies in the DC link voltage are significant enough. The motors may no longer be
able to maintain their setpoint speed or the acceleration/braking phases are prolonged.
In a drive line-up, one or more drives can be used to relieve or support the DC link. This
allows a fault due to an unfavorable DC link voltage to be avoided. The drives remain ready
for operation.
Generally, a maximum motoring power p
P
mot
Correspondingly, a maximum regenerative feedback power Pgen of the Motor Module into
the DC link of
P
gen
114
= V x (V
DC, actual value DC, actual value
= V x (p1244 - V
DC, actual value
of the Motor Module from the DC link is given by
mot
- p1248) x p1250
) x p1250 is obtained
DC, actual value
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Drive functions