Basic recommendations, General – ElmoMC Gold Line Digital Servo Drives-Gold DC Bell User Manual
Page 20
Gold DC Bell Installation Guide
MAN-G-DCBELIG-EC (Ver. 1.200)
||Basic Recommendations
20
6.1. Basic Recommendations
6.1.1.
General
1.
Use shielded cables. For best results, the cable should have an aluminum foil shield covered
by copper braid, and should contain a drain wire.
Use 24, 26 or 28 AWG twisted-pair shielded with drain wire cables.
2.
Keep the cable as short as possible.
Do not mount the power cables of the motor and power bus in the proximity of the control
and feedback cables.
3.
Ensure that in normal operating conditions, the “earth connection” wires and shield of the
control cables 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 might result in
drive/controller/host failure.
4.
After completing the wiring, carefully inspect all wires to ensure tightness, good solder of
joints and general safety.
Figure 4: Feedback and Molex Control Cable Assemblies
Note:
Please pay attention to the location of PIN 1 in the above connector diagram.
It should be noted that in all Elmo manuals the pinouts are shown differently to Molex’s technical
sheets. Molex shows pin 1 at the bottom-left when looking at the face of the cable-side connector,
tab down (Figure 5).
Figure 5: Molex vs Elmo Technical Diagram Examples Showing Pinout Numbers
However, Elmo specifies pin 1 as the bottom-left of drive-side connector. The result is that Elmo’s
pin designations are mirrored relative to the pinouts as labeled by Molex.
Where there is only one COMRET pin (Common Return) in the connector, which MUST be
connected to the DRAIN WIRE and also to COMRET signal of the cable, it is necessary to connect the
drain wire and COMRET signal to the same pin.