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8
Ivory Se ries In stal la tion & Op er a tion Man ual
For a more in-depth overview of ground wiring techniques, refer to technical note #1027, "HMI Ground Wiring and
Electrical Noise Reduction," which you can find
at
http://www.maplesystems.com
in the Support Center section.
Con nect Panel PC Chas sis Ground to Con trol Panel
To reduce the possibility of electrical interference, connect the chassis ground terminal of the computer 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 computer to a clean earth ground point located close to the panel.
Frame ground (marked FG)
Stud or screw
Control Panel
Area on panel free of paint.
Panel PC Chas sis Ground connection
Power Sup ply Se lec tion
The power supply used to power the computer should provide an output of +24 VDC 5% measured at the Panel PC
power terminal block. A 24VDC regulated power supply dedicated to the computer is required.
The power cable for the computer 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 computer 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.
1010-1010, Rev 02
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