3.
4.
1.
2.
3.
4.
5.
6.
7.
8.
9.
It is essential to keep feedback devices wiring as far as possible from motor, AC power and all other
power wiring.
Connection between Pluto PE (Portective Earth pin) and the motor metallic housing is
essential to provide a low impedance path and minimize noise coupling to the feedbacks. This
connection should be separate from the feedbacks.
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 twisted pair cable
to electromagnetic fields by twisting the two signal leads at 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 Pluto 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.
If the analogue signal source is differential and the signal source ground is common with the drive
GND, use a 2-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-).
For all of the above cases, connect the cable shield to the signal source connector frame and leave
the other shield end unconnected to avoid ground loops. To further increase the noise protection,
use a double shielded cable with inner shield connected to signal source GND and outer shield
connected to the signal source I/O connector frame. Leave both shields unconnected on the driver
side.
If the signal source output voltage is larger than +/-10 V, use a 3-resistor differential divider, located
near the servo drive connector.
IO connections
The Pluto Servo Drive provides various for parameter observation and drive inputs and output pins
configuration options.
The input and output pins are summarized below:
2 x 5 V non-isolated digital outputs.
2 x 5 V low speed non-isolated single ended digital inputs. (GDI1, GDI2)
2 x 5 V high speed non-isolated differential digital inputs.
1 x (±10 V) differential 12 bits analog input.
1 x 0 ~ 5 V single ended 12 bits analog input
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