Nix Product Manual |
Wiring and Connections
INGENIA | 01/22/2019
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Digital encoders with differential 24 V outputs
To interface with 24 V push-pull style differential encoders, it is recommended to connect 4.7 kΩ 1/4 W resistors in
series between the encoder signals and the corresponding drive inputs.
This ensures a correct differential signal reading as well as limiting currents to safe levels. Note that this additional
resistance may limit the maximum encoder frequency to approximately 1 MHz by making a low pass filter with the
100 pF input capacitance.
Encoder broken wire detection
Nix Servo Drive includes a broken wire detection circuit. The circuit is based on 3 EX-OR gates that will generate
an
if the encoder is disconnected or a wire is broken.
This system only works for differential encoders.
7.4.4 Analog encoder (Sin-Cos encoder) interface
The Nix Servo Drive can use analog encoder (also known as Sin-Cos encoder) as position and velocity feedback
element. This sensor provide a pair of quadrature sine and cosine signals as the motor moves, which frequency
depends on the motor speed. The signals may be generated by optical or magnetic means. For noise immunity the
signals are typically transmitted differentially from the encoder to the sensor interface electronics.
Pin
Signal description
Signal example
Encoder without Index (Z) line
To avoid a broken wire fault when the differential encoder has no index (Z) line, connect the negative pin
(ENC_Z-) to GND (this ensures the XOR result = 1) or configure the encoder as single ended in MotionLab.
