2 Assembly and installation
BU 0505 EN-3021 73
2.10 Colour and contact assignments for encoders
Encoder input X6
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 500 and 8192 increments. This is set with the normal scaling via parameter
P301 "Incremental encoder pulse number" in the menu group "Control parameters". 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.
Unlike incremental encoders, for sine encoders or SIN/COS encoders the signals are not in the form
of pulses, but rather in the form of sine signals (shifted by 90°).
Rotary encoder counting direction
The direction of rotation of the incremental encoder must correspond to that of the motor. Therefore, depending
on the rotation direction of the encoder to the motor (possibly reversed), a negative number must be set in
parameter P301.
Rotary encoder function test
The voltage difference between tracks A and B can be measured with the aid of parameter P709 [-09] and [-10]. If
the incremental encoder is rotated, the value of both tracks must jump between -0.8V and 0.8V. If the voltage only
jumps between 0 and 0.8V the relevant rack is faulty. The position can no longer be reliably determined via the
incremental encoder. We recommend replacement of the encoder!
Pos: 101 /Anleitungen/ Elektronik/F U und Starter/2. Montage und Ins tallation/Elektr ischer Anschluss/ Drehgeber/Farb- und Kontaktbelegung für Drehgeber- Inkrementa lgeber [SK 5xxE] @ 1\mod_13312 16115763_388.doc x @ 17854 @ 5 @ 1
Incremental encoder
According to the resolution (pulse number), incremental encoders generate a defined number of
pulses for each rotation of the encoder shaft (Track A / Track A inverse) With this, the precise speed
of the encoder or motor can be measured by the frequency inverter. By the use of a second track (B /
B inverse) shifted by 90° (¼ period), the direction of rotation can also be determined.
The supply voltage for the encoder is 10-30V. The voltage source can be an external source or the
internal voltage (according to the frequency inverter version: 12 V /15 V /24 V).
Special terminals are available for connection of a rotary encoder with TTL signals. Parameterisation
of the corresponding functions is made with the parameters from the group "Control parameters"
(P300 et seq.) TTL encoders enable the best performance for control of a drive unit with frequency
inverters SK 520E and above.
The digital inputs DIN 2 and DIN 4 are used to connect an encoder with an HTL signal.
Parameterisation of the corresponding functions is carried out with parameters P420 [-02/-04] or P421
and P423 as well as P461 – P463. In contrast to TTL encoders, HTL encoders only enable restricted
performance for speed control (lower limit frequencies). However, they can be used with a
considerably lower resolution and also for SK 500E.
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