Application Manual Electronic Gear
19
09/08
09/08
Application Manual Electronic Gear
19
4.7
Index Control
The electronic gearbox with index control is available in configurations 116, 216 and
516. Via index control, deviations from synchronous running which are due to process
changes can be detected directly in the process by sensors and compensated by the
index controller. The sensors detect reference points of the Master drive and the Slave
drive and produce the index signals from these reference points. The time difference
between the index signals resulting from the different position of the drives is compen-
sated, thus the drives are synchronized.
Note: The connection of the index signals is described in chapter 2.1"Control Ter-
minals".
Example: Synchronous running of transport conveyors
The transported material is conveyed from one conveyor to the next and taken along
by cams which serve as reference marks. The position of the reference marks is de-
tected by sensors which supply the index signals for controlling the synchronous op-
eration. The Slave drive is accelerated or decelerated depending on the time difference
between the index signals from the Master and the Slave. Synchronous operation is
restored as soon as the time difference is compensated, i.e. the reference marks of the
Master and the Slave are detected by the sensors at the same time.
Index Control Principle:
Master
Slave
Sensor
Sensor
Transport good
Δ
f
soll
PI-Controller
f
soll
Limit
593
0
Index Controller
Release
96
Phase Discriminator
Master Index
Divider
594
Amplification
591
Integral Time
592
Indexsignal Master
Indexsignal Slave
Offset
596
50 - Synchronisation Fault
51 - Signal Fault
692 - Index Contr.: Warning Period
N
1
N
1
+
+
Slave Index
Divider
595