Lenze EDB9300UES - Manual (Page 81)

Transport, Installation and Connection
76 BA8230
Notes on encoder connection
In the modes of operation “Speed control with encoder” and “Torque control with
encoder” highly accurate speed actual value detection is necessary and incremental
encoders must be used.
To compensate for the effects of interference (inphase interference) on the cables the
encoders to be used have two pulse tracks offset through 90° electrical and
complimentary outputs. To guarantee adequate interference resistance we
recommend encoders with a 24 V operating voltage.
The quality and length of the encoder cable are criteria for the maximum encoder
transmission frequency. Screened cables with the conductors twisted in pairs are to
be used. The screen is to be connected at both ends.
These cables must be laid in the system so that they are separate from power cables.
We recommend the encoder cable should run directly to the encoder interface, i.e.
with no interruptions. The screen is to be surrounded fully using the screen clamps
supplied, to ensure a firm connection at the control electronics cassette.
Recommended encoder
cable: LIYCY (TP) 3 x 2 x 0.75 mm²
(Data cable with copper braid, twisted in pairs)
Example configurations, cable length = 100 m
n
max
[rpm] 6000 4000 3000 2400 1670
n
min
[rpm] 1.2 0.8 0.6 0.5 0.4
No. of markings
[pulses per revolution]
1000 1500 2000 2500 3600
When using an incremental encoder with 1000 pulses per revolution the example for
digital demand preset therefore results in a speed control accuracy of 0.05 % at n
max
.
The accuracy of the encoder and an undisrupted transmission capability particularly
for 5 V encoders due to their low interference resistance play a major part in
determining the accuracy of speed detection.
See section 2.5.6.1, Encoder interface, for using encoders and the technical data of
the encoder input.
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