Yaskawa SmartTrac AC1 - Manual (Page 76)

SMART TRAC AC1
8-6
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Appendix C - Wiring, Grounding and Installation Practices for Noise ImmunityTechnical Manual TM 3554-000
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Low voltage signals such as analog inputs and outputs for speed or
torque control, digital inputs and outputs, and 24 VDC used for control
of the customers operating interface, should be run using shielded
cable, containing twisted pair(s).
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All AC relay coils should have RC snubber devices attached.
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Verify shield drain wire connections do not form ground loops.
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Motor thermistor wires should not be routed with the Power wiring nor
AC Control.
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Grounding wire sizing shall meet the minimum of equipment
grounding of NEC Table 250-95.
Wires must be separated into groups, as described below:
1. POWER AC WIRING 230/460/575 (usually heavy black wires). This
is the main input power to the drive for driving the load. Group
together:
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Leads to DC Link filter inductor.
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Leads to power line filter (05P00325-0023)
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May include power to a step-down transformer (typically wired
from the drive’s power terminals) for use as input power for the
controls.
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110 VAC wiring to the control power supply but not wiring going
to relay circuitry.
2. POWER DRIVE OUTPUT WIRING (usually heavy black wires).
Group:
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Power wiring to the motor.
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Also includes ground wire from drive to motor.
3. POWER DC BUS WIRING (separated from others)
4. POWER CONTROL 110 VAC. Group:
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Wiring used for relay control logic.
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Do NOT include 110 VAC wiring to the control power supply
because noise from the relay/contactor coils and contacts can
easily be coupled to the control power supply.
5. LOW VOLTAGE AC, DC. Group:
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24 vdc
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Analog Inputs (shielded)
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Analog Outputs(shielded)
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Low voltage dc
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4 ~ 20 mA(shielded)
6. ENCODER SIGNALS. Group:
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AC (shielded)
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DC (shielded)
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Digital (shielded)
Wire separation
groups – STANDARD
PRACTICE: