ElmoMC SimplIQ Digital Servo Drives-Whi-Trio Installation Guide - Manual (Page 62)

The drain wire is a non-insulated wire that is in contact with parts of the cable,
usually the shield. It is used to terminate the shield and as a grounding connection.
 The impedance of the wire must be as low as possible. The size of the wire must be
thicker than actually required by the carrying current. A 24, 26 or 28 AWG wire for
control and feedback cables is satisfactory although 24 AWG is recommended.
 Use shielded wires for motor connections as well. If the wires are long, ensure that
the capacitance between the wires is not too high: C < 30 nF is satisfactory for most
applications.
 Keep all wires and cables as short as possible.
 Keep the motor wires as far away as possible from the feedback, control and
communication cables.
 Ensure that in normal operating conditions, the shielded wires and drain carry no
current. The only time these conductors carry current is under abnormal conditions,
when electrical equipment has become a potential shock or fire hazard while
conducting external EMI interferences directly to ground, in order to prevent them
from affecting the drive. Failing to meet this requirement can result in
drive/controller/host failure.
 After completing the wiring, carefully inspect all wires to ensure tightness, good
solder joints and general safety.
.34.1 Recommended Wire Cross Sections
Function Connection Details
Motor PE, M1, M2, M3 14 AWG
Feedback and Control Main FEEDBACK
PULSE & DIRECTION
I/O 24 AWG twisted pair shielded
cables
Communications RS-232
CANopen 26 AWG twisted pair shielded
cables