NORD Drivesystems BU0510 - Manual (Page 11)

2 Encoder connection
BU 0510 GB-3911 Subject to technical alterations 11
2.2 Colour and contact assignments for encoders
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 incremental encoders must not
exceed 150 mA. The supply voltage for the rotary encoder is 10-30V.
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 min
-1
the encoder should not have more than 2048
pulses/rotation.
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°).
ATTENTION
The 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.
NOTE
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 determined via the incremental encoder. We recommend
to replace the encoder!