Velocity Compensation - Siemens SINUMERIK 840D Description Of Functions

02.99
Reference value
for pressure
sensors
Manipulated valve
voltage offset
3.9.3

Velocity compensation

Objective
 Siemens AG 2000. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital Descr. of Functions HLA Module (FBHLA) – 04.00 Edition
Note
Only in combination with pressure sensing function.
Enter characteristic data of pressure sensors from data sheet in
S
MD 5550: PRESSURE_SENS_A_REF (reference value for pressure sensor
A)
S
MD 5552: PRESSURE_SENS_B_REF (reference value for pressure sensor
B)
according to data sheet.
Objective: Adjustment of electro-hydraulic zero point
The voltage is adjusted automatically by the following sequence of operations:
S
Preset velocity controller with I component (e.g. V
Section 4.3.2).
S
In position-controlled mode at zero speed with all enabling signals applied
(drive can be traversed with JOG keys).
S
Set MD 5650 bit 13. (Bit 13 is automatically reset after about 30 s.)
S
MD 5470: OFFSET_COMPENSATION offset compensation is set automati-
cally.
Owing to the tolerances of the valves and drive units with
S
real areas
S
real valve edge,
it is advisable to readjust the controlled system gain for the purpose of obtaining
a symmetrical actual velocity.
∆v
move out
The gain is adjusted via machine data
S
MD 5435: CONTROLLED_SYSTEM_GAIN
and
S
MD 5462: AREA_FACTOR_POS_OUTPUT/
MD 5463: AREA_FACTOR_NEG_OUTPUT
durchgeführt.
Controller parameters
S
P: P gain of velocity controller (MD 5406/MD 5407/MD 5408)
S
I: reset time of velocity controller (MD 5409)
S
D: D-action time of velocity controller (MD 5431/MD 5432/MD 5433)
must be set to 0.
3.9 Fine adjustment and optimization
=–10%, T
p
= ∆v
move in
(stage 1)
(stage 2).
3 Start-Up
=30 ms) (see
N
3-67