ABB ACSM1 - Page 74

Drive control and features
74
t
1
: Rising edge of encoder digital input DI1 signal (proximity switch signal) is
detected when the master (motor) position should be 60°. The used position
reference is 90° (stored to signal 4.03 PROBE1 POS MEAS).
The master reference correction function calculates the position error, 4.05 CYCLIC
POS ERR, which is the difference between the master (motor) position and the
reference position:
4.05 CYCLIC POS ERR = 62.16 PROBE1 POS - 4.03 PROBE1 POS MEAS = 60° -
90° = -30°
t
2
: Error has been corrected and the follower (load) is in line with the master (motor).
Cyclic function is ready for a new correction if necessary.
t
1
t
2
t
1
t
2
90
-30
360 = 0
330
0
x
°
x° - 30°
90°
60°
X°- 30°
60°
4.03 PROBE1 POS MEAS
Encoder DI1
4.05 CYCLIC POS ERR
4.18 SYNC ERROR
1.12 POS ACT
Real master position
MASTER
(motor)
FOLLOWER
(load)
Proximity
switch
Encoder DI1
Position ref. 90°
4.16 SYNC REF GEARED