2 Assembly and installation
BU 0800 en-4521 41
Encoder
type
Signal Connection type Number of
poles
NORDAC ON
SK 30xP
NORDAC ON+
SK 31xP
Universal –
RS485
1)
+ V
RS485A
RS485B
Motor
mounting
Internal
4 – X
Wall mounting Via X6
Universal –
SSI/BISS
+ V
Data-
Data+
CLK-
CLK+
Motor
mounting
Internal
6 – X
Wall mounting Via X6 3)
Universal –
TTL
+ V
A+
A-
B+
B-
Motor
mounting
Internal
6 – X
Wall mounting Via X6 3)
HTL
2)
GND
+ V
A+
A-
Motor
mounting
Via DIN3
and DIN4
in M5
4 X X
Wall mounting
1)
By default, the wall-mountable NORDAC ON+ is equipped with a suitable socket (5-pole, A-coded) for the Universal RS485 encoder.
In the motor-mounted version, the HTL encoder connection, due to its design, is not intended for motor speed control, but for the
determination of application positions or speeds.
An 8-pole connection socket is not intended by default, but can be implemented on request.
Encoder input
The incremental encoder connection is an input for a type with two tracks and TTL-compatible signals
for EIA RS 422-compliant drivers. The maximum current consumption of the incremental encoder
must not exceed 150 mA.
The pulse number per rotation can be between 16 and 8192 increments. This is set with the normal
scaling via parameter P301 "Incremental encoder pulse number" in the "Speed control” menu group.
For cable lengths > 20 m and motor speeds above 1500 rpm the encoder should not have more than
2048 pulses/revolution.
For longer cable lengths the cable cross-section must be selected large enough so that the voltage
drop in the cable is not too great. This particularly affects the supply cable, in which the cross-section
can be increased by connecting several conductors in parallel.
Encoder signal faults
Wires that are not required (e.g. Track A inverse / B inverse) must be insulated. Otherwise, if these
wires come into contact with each other or the cable shield, short-circuits may occur, which can cause
encoder signal problems or destruction of the encoder.
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