Everest XCR - Product Manual |
Wiring and Connections
INGENIA | 08/04/2019
51
9.5.5. Feedback wiring recommendations
Signal distortion and electrical noise is a common problem in feedback signals. These problems can result in a bad
position or velocity calculation for both digital feedbacks (gain or loss of counts) and analog feedbacks (wrong
voltage levels).To minimize these problems some wiring recommendations are shown:
•
Use differential signals
whenever is possible. That is, connect both positive and negative signals of
differential feedback sensors.
Use a twisted pair for each differential group of signals
and another
twisted pair for the +5 V supply and GND. Twisted-pairs help in elimination of noise because disturbances
induced in twisted pairs
•
Twisted-pairs help in elimination of noise due 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 Everest XCR and encoder GND signals
even if the encoder supply is not provided by the drive.
•
Connection between Everest XCR PE and the motor metallic housing is essential
to provide a low
impedance path and minimize noise coupling to the feedback. For further information, see
.
•
For better noise immunity, use shielded cables,
with the shield connected to PE only in the drive side.
Never use the shield as a conductor carrying a signal, for example as a ground line.
•
It is essential to
keep feedback wiring as far as possible from motor power,
AC power and all other power
wiring.
9.6. Inputs and Outputs
The Everest XCR Servo Drive provides several inputs
and output terminals for parameter observation and drive
control options.
•
4x
5 V non-isolated single ended digital inputs
(IN1, IN2, IN3, IN4).
•
1x
±10V differential 16 bit analog input
(AN1+, AN1-)
•
4x
5 V non-isolated digital outputs
(OUT1, OUT2, OUT3, OUT4).
Non-isolated I/O
Everest XCR inputs and outputs are not isolated.
The reference voltage of the drive (GND_D) and the
ground of the devices connected to I/Os must be the same. Otherwise inputs or outputs may be damaged.
For long distances or noisy environments it is recommended to use isolators like Silicon Labs Si87xx series,
Texas Instruments ISO121x.
