Guidelines for making your own cables, Recommended wire cross sections – ElmoMC SimplIQ Digital Servo Drives-Whistle DC Installation Guide User Manual
Page 75
DC Whistle Installation Guide
Cables (Optional)
MAN-DCWHIIG (Ver. 1.101)
75
5.7. Guidelines for Making Your Own Cables
Proper wiring, grounding and shielding are essential for ensuring safe, immune and optimal
servo performance of the DC Whistle. If you do not plan to use cables provided by Elmo, follow
the instructions below carefully.
Caution:
Perform the following instructions to ensure safe and proper wiring.
1.
Use twisted pair shielded cables for control, feedback and communication connections. For
best results, the cable should have an aluminum foil shield covered by a copper braid and
should contain a drain wire.
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.
5.7.1.
Recommended Wire Cross Sections
Function
Connection
Details
Motor
PE, M1, M2, M3
14 AWG
Feedback and Control
Main Feedback Auxiliary
Feedback I/O
24 AWG twisted pair shielded
cables
Communications
RS-232 CAN
26 AWG twisted pair shielded
cables