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PC100 Series Operation Manual
Connect Panel PC Chassis Ground to Control Panel
To reduce the possibility of electrical interference, connect the chassis ground terminal of the Panel PC to a clean
earth ground. If the control panel is metal, make sure it is properly grounded. Then connect a short heavy-gauge
wire (#18 AWG) from the chassis ground terminal of the computer to a mounting bolt on the control panel door.
The mounting bolt must have good electrical contact to the control panel; scrape away any paint that may be
covering the panel to provide a good connection.
If the control panel is made of a non-conductive material, it is essential that you connect the chassis ground terminal
of the Panel PC to a clean earth ground point located close to the panel.
Power Supply Selection
The power supply used to power the Panel PC has the following requirements:
80 Watt DC 24V power supply adapter
The power cable for the Panel PC should be 18AWG, 2-conductor wire with a shield drain wire and protective
shield (foil or braid). The shield drain wire must be connected to earth ground at both ends of the cable. Please refer
to the "Connect the Panel PC to Power" section for more information.
A power line filter installed at the AC input to the Panel PC power supply is highly recommended as a safeguard
against conducted RF noise, which is often present on factory power lines. The wires connecting the output of the
power line filter to the power supply should be kept as short as possible to minimize any additional noise pickup.
The case of the power line filter should be connected to a quiet earth ground. The power line filter should have a
current rating of at least 3 Amps with common mode and differential mode attenuation.
Do not use the power supply used to provide power to the computer to power switching relays, solenoids, or other
active devices.
Cable Routing and Noise Immunity
Follow these guidelines when routing cable to the Panel PC:
Always route the computer communication cable and the power cable away from any AC voltage or rapidly
switching DC control lines.
Never bundle the computer cables together with 120VAC power wires or with relay wiring.
Try to keep at least 8 inches (20 cm) of separation between the Panel PC cables and other power wiring. If
voltages greater than 120VAC are used in the system, greater separation is required.
If the Panel PC cables must come near AC wiring, make sure they cross at 90 degrees.
Run AC power wires in a separate grounded conduit to reduce electrical noise interference.
Keep the cable lengths for the computer as short as possible. Do not coil excess cable and place it next to
AC powered equipment.
Cover any equipment used in the enclosure that operates at high frequency or high current levels with a
grounded metal shield.
DC Jack
7
1010-1022 Rev. 01
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