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Installation Guide
INGENIA MOTION CONTROL
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8.3.3 Feedback wiring recommendations
The most frequent problems encountered in transmitting feedbacks signals to the receiving electronics are signal distortion and electrical noise. Either problem can
result in gain or loss of counts for digital feedbacks or bad voltage levels for analog ones. To minimize these problems there are some essential good wiring
practices that should followed:
Always connect both positive and negative signals when using differential digital encoders, Hall sensors, PWM encoders or analog feedbacks. Use one
twisted pair for each differential group of signals and another twisted pair for the 5 V supply and GND.
Keep the ground connection between an encoder and the Jupiter Servo Drive even if the encoder supply is not provided by the drive. In very noisy
environments, connect the cable shield to the connector shield only at one side. Never use the shield as a conductor carrying a signal, for example as a
ground line.
It is essential to keep feedback devices wiring as far as possible from motor, AC power and all other power wiring.
ANALOG SIGNALS SPECIFIC WIRING RECOMMENDATIONS
Following are several recommendations for analog signals wiring which can effectively reduce noise interference:
Use
to improve noise immunity. Twisted-pairs help in elimination of noise due to electromagnetic fields by twisting the two signal leads at
twisted pair cable
regular intervals. Any induced disturbance in the wire will have the same magnitude and result in error cancellation.
Connect the common of the signal source to Jupiter GND if available to minimize common mode noise.
Use an isolated power supply for the analog input circuit, this will prevent the formation of ground loops.
If the analogue signal source is single-ended and the signal source ground is isolated from the drive GND, use a 2-wire shielded cable as follows: 1st wire
connects the live signal to the drive analog input 1; 2nd wire connects the signal ground to the drive ground.
If the analogue signal source is single-ended and the signal source ground is common with the drive GND, use a 2-wire shielded cable as follows: 1st wire
connects the live signal to the drive analog input 1; 2nd wire connects the signal ground to the drive ground.
If the analogue signal source is differential and the signal source ground is isolated from the drive GND, use a 3-wire shielded cable as follows: 1st wire
connects the signal plus to the drive analog 2 positive input (2+); 2nd wire connects the signal minus to the drive analog 2 negative input (2-) and 3rd wire
connects the source ground to the drive GND.