Power Wiring
ANCA Motion
D-000088 Rev 09
51
6
6.8.2.2
Cable Routing
In a drive system the return common mode currents flow through shields, cabinets, gear tray and earth wiring to
create localized parasitic ground potentials, which may affect control signals using the ground as a common
voltage reference. Careful planning of cable routing and location of shield grounds must be done to minimise
influence of parasitic ground potentials, and ensure compliance with EMC requirements. The following guidelines
must be followed.
Physically separate “noisy” and “clean” cables at the planning stage. Pay special attention to the motor
cable. The area around the shared terminal strip for the mains input and motor output is particularly at
risk.
All cable routing in an enclosure should be mounted as close as possible to gear tray or grounded
cabinet walls; “free-floating cables” act as both active and passive antennae.
Use twisted pair wires wherever possible to prevent interference from radiated common mode noise
sources. Continue the twist as close as possible to terminals.
Use shielded twisted pairs for analogue and control level wires exiting from the overall enclosure.
Keep power and control wiring separate. Crossing at right angles is permitted, but no significant parallel
runs should be allowed, and cables should not share cable trays, trunking or conduits unless they are
separately shielded and the shields correctly terminated
Avoid mixing pairs with different signal types e.g., 110 V AC, 240 V AC, 24 V DC, analogue, digital.
If plastic trunking/ducting is used, secure it directly to installation plates or the framework. Do not allow
spans over free air which could form an antenna.
Keep shield pigtails as short as possible and note they are less effective than full clamping
Allow no breaks in the cable shields.
Earthing connections should be as short as possible in flat strip, multi-stranded or braided flexible
conductors for low RFI impedance.
Summary of Contents for AMD2000 Series
Page 1: ...AMD2000 Series D2xxx Servo Drive User Guide D 000088 Rev 10 ...
Page 131: ...Technical Data ANCA Motion D 000088 Rev 09 119 10 ...
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