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Ensemble Epaq Hardware Manual
2.1.2. Minimizing Conducted, Radiated, and System Noise
To reduce electrical noise, observe the following motor and input power wiring techniques.
1. Use shielded cable to carry the motor current and tie the shield to earth ground.
2. Use a cable with sufficient insulation. This reduces the capacitive coupling between the leads that, in
turn, reduces the current generated in the shield wire.
3. Provide strong earth ground connections to the amplifier and the motor. Offering electrical noise a low
impedance path to earth ground not only reduces radiated emissions, but also improves system
performance.
4. Motor cables must be physically separated from low level cables carrying encoder and IO signals.
5. User connections to the product must be made using shielded cables with metal D-style connectors
and back shells. The shield of the cables must be connected to the metal back shell in order for the
product to conform to the radiated emission standards.
6. The Epaq is a component designed to be integrated with other electronics. EMC testing must be
conducted on the final product configuration.
7. Ferrite beads or Aerotech's FBF-1 or FBF-2 filter adapters, may be used on the motor leads to reduce
the effects of amplifier EMI/RFI, produced by PWM (pulse width modulation) amplifiers. Refer to the
FBF-1 and FBF-2 drawings on your installation device for more information on the ferrite beads.
Table 2-2:
Ferrite Bead Part Numbers
Wire Size
2
2.0 mm
(#14 AWG)
2
1.3 mm
(#16 AWG)
2
0.8 mm
(#18 AWG)
2
0.5 mm
(#20 AWG)
2.1.3. I/O and Signal Wiring Requirements
The I/O, communication, and encoder feedback connections are typically low amplitude signals. Wire and
connectors used for signal wiring must be rated for at least 30 V and have a current capacity of at least .25
Amp. Wires and connectors used for low voltage power connections such as +5V must have a current
capacity of at least 1 Amp (encoder feedback +5V supply requires .6 Amps in some applications). In
applications where there are significant wire distances, a larger wire size is required to reduce the voltage
drops that occur along the wires. This increase is necessary to keep the voltage within tolerance at a remote
point.
When signal wiring is in close proximity to wiring operating at voltages above 60 Volts, the insulation rating
of the signal wiring must be rated for the higher voltage. Use signal wiring with a voltage rating of at least 300
Volts when it is in proximity to AC power or motor power wiring.
20
Aerotech P/N
EIZ01027
EIZ01025
EIZ01001
EIZ01001
Chapter 2
Installation and Configuration
Third Party P/N
#2643002402 Elna-Fair-Rite Products
#2643250402 Elna-Fair-Rite Products
#2673000801 Elna-Fair-Rite Products
#2673000801 Elna-Fair-Rite Products
www.aerotech.com
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