ABB ACSM1 Series, Manual

Page: 74 / 510

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