ABB ACSM1 Manual page 76

76
MASTER
DI2
0°
t
1
DI2
t
2
DI2
°
x
t
3
°
x
t : Rising edge of encoder DI2 signal (proximity switch signal) is detected when the
1
master position is 0°. The follower position is -130° (stored to signal
POS
t : Rising edge of encoder DI1 signal (proximity switch signal) is detected when the
2
follower position is 0°. The actual position of the encoder is -30° (stored to signal
4.03 PROBE1 POS
position is 0° - (-30°) = 30°.
According to parameter
follower should be 120° behind the master.
The following phase shift between the master and follower is calculated and stored
as reference error
(62.18 PROBE2 POS
PROBE1 POS
t : Error has been corrected and the follower is 120° behind the master. Cyclic
3
function is ready for a new correction if necessary.
Note 1: Only after the active correction is finished is the next position latching
enabled.
Note 2: The cyclic corrections are always performed along the shortest path. This
must be taken into account in all rollover applications.
Note 3: In rollover applications, the correction range is limited to ±180°.
Drive control and features
FOLLOWER
DI1
4.04 PROBE2 POS MEAS
4.03 PROBE1 POS MEAS
-100°
4.05 CYCLIC POS ERR
DI1 CYC POS ACT ERR
0°
DI1
°
- 120
MASTER
FOLLOWER
4.16 SYNC REF GEARED
1.12 POS ACT
MEAS).
MEAS). Distance between the follower position and the actual
62.16 PROBE1 POS
4.05 CYCLIC POS
- 4.04 PROBE2 POS
MEAS) = [-120° - (-130°)] - [0° - (-30°)] = -20°
Encoder DI2
Encoder DI1
4.18 SYNC ERROR
and
ERR.
MEAS) -
t t
1 2
62.18 PROBE2 POS
(62.16 PROBE1 POS
t
3
-130
-30
-20
30
360 = 0
340
0
°
x
° °
x - 120
°
0
°
-30
°
-100
°
-130
4.04 PROBE2
settings the
- 4.03