Drive control and features
67
t
1
: Rising edge of encoder digital input DI1 (proximity switch signal) is detected. The
follower position is 20 mm (stored to signal 4.04 PROBE2 POS MEAS).
t
2
: Rising edge of encoder digital input DI2 signal (proximity switch signal) is
detected when the follower position is 40 mm (stored to signal 4.03 PROBE1 POS
MEAS).
According to parameter 62.16 PROBE1 POS and 62.18 PROBE2 POS settings the
follower should be 10 mm behind the master.
The following correction is calculated and stored as reference error 4.05 CYCLIC
POS ERR:
(62.16 PROBE1 POS - 62.18 PROBE2 POS) - (4.04 PROBE2 POS MEAS - 4.03
PROBE1 POS MEAS)] = (15 mm - 25 mm) - (20 mm - 40 mm)] = 10 mm
This error is added to 4.18 SYNC ERROR. The synchron error is corrected using
positioning parameters.
t
3
: Error has been corrected and the follower is 10 mm behind the master. Cyclic
function is ready for a new correction if necessary.
Distance correction with one probe
The purpose is to correct actual position according to the distance between the
latched positions and measured positions when two consecutive latches from one
probe are used. Both latches use the same latch signal source (e.g. encoder digital
input DI1) and latch command (e.g. rising edge). If the application requires different
latch commands, see section Distance correction with two probes on page 69.
40 mm
t
2
t
3
20 mm
30 mm
t
1
4.03 PROBE1 POS MEAS
4.18 SYNC ERROR
1.08 ENCODER 1 SPEED
Encoder DI1
Encoder DI2
4.04 PROBE2 POS MEAS
1.12 POS ACT
4.16 SYNC REF GEARED
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