Rockwell Automation MPL-xxxx Low-inertia Servo Motors 75 mm or Smaller - Manual (Page 7)

MP-Series Low-inertia Brushless Servo Motors with 75 mm or Smaller Frame Sizes 7
Rockwell Automation Publication MP-IN006C-EN-P - January 2014
Build and Install the Cables
Correct cable routing and careful cable construction improves system electromagnetic
compatibility (EMC).
Follow these guidelines to build and install the cables:
•
Keep the wire lengths as short as possible.
•
Route noise sensitive wiring (encoder, serial, and I/O) away from input power and motor
power wiring.
•
Separate cables by 0.3 m (1 ft) minimum for every 9 m (30 ft) of parallel run.
•
Ground both ends of the encoder cable shield and twist the signal wire pairs to prevent
EMI from other equipment.
Shield the Power Cable
Follow these steps to shield the power cable.
1. Verify the separate signal wire shield connects to the overall chassis ground by looping
back each of the signal wire pairs as shown in the diagram.
2. Clamp all three shields together at the power cable (chassis) ground connection on the
drive.
ATTENTION: High voltage can be present on the shield of a power cable, if the shield is not grounded.
Verify that there is a connection to ground for any power cable shield.
ATTENTION: MP-Series motors produce leakage current in the protective earthing conductor that exceeds
3.5 mA AC and/or 10 mA DC.
Be sure to properly ground the motor cables per the drive installation instructions.
ATTENTION: High voltage can be present on the shields of a power cable, if the shields are not
grounded.
Verify there is a connection to ground for all shields in the power cable.