User Manual

TL-Series Servo Motors 7
Publication TL-IN003A-EN-P — June 2007
Interconnect Cables
Knowledgeable cable routing improves system electromagnetic compatibility (EMC). Refer to
Shielding of Brake Wires Within the Power Cable on page 9 for cable shield groundi ng at the servo
drive.
Follow these steps to install the cables.
1. Keep wire lengths as shor t as physically possible.
2. Route signal cables away from motor and power wiring. Ty pical signal ca bles t r ansmit
enc od e r, serial, or an al o g da t a at l o w voltages.
3. Separa t e cables by 0.3 m (1 ft) minimum for every 9 m (30 ft) of parallel r un.
4. Ground both ends of the ca ble shield and twist the signal wire pairs to prevent
electromagnetic interference (EMI) from other equipment.
Electrical Noise
ElectroMagnetic Interference (EMI), com m only called noise, adversely impacts motor performan ce
by inducing stray signals. Effective techniques to counter EMI inclu de filtering the ac power,
shielding and separating signal carrying lines, and practicing good grounding techniques. Effective ac
power filtering can be achieved by using isolated ac power transfo rm ers or properly installed ac line
filters.
To reduc e EMI follow these guidelines:
• Physically separate signal lines from motor cabli ng and power wiring. Do not ro ute signal
wires with motor and power wires, and do not route signal wires over the vent openings of
servo drives or other electrical power sources.
• Ground all equipment by using a single-point parallel ground system that employs ground bus
bars or large straps . If necessary, use additional electrical noise reduction techniques to reduce
EMI in noisy environments.
ATTENTION
High voltage can be present on the shields of a power cable, if the shiel ds are
not grounded.
Ver ify there is a connection t o ground for all shields in the power cable.
Failure to observe these safet y pr ocedures cou ld result in persona l injury or
damage to equipment.