Con Nect Oit Chas Sis Ground To Con Trol Panel; Power Sup Ply Se Lec Tion - Maple Systems HMI5056T Installation Manual

6
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Connect the power cable's shield wire to the OIT's chassis ground terminal.
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Connect the control panel to earth ground using a copper grounding rod close to the OIT
and control panel.
Hinged doors on control panels do not provide a long-term electrical connection to the rest of
the enclosure. Corrosion develops over time and prevents good electrical contract. For this
reason, a separate wire braid should be installed from the hinged control panel to the rest of
the enclosure.
For a more in-depth overview of ground wiring techniques, refer to technical note #1027,
"OIT Ground Wiring and Electrical Noise Reduction," which you can find on our web site.

Con nect OIT Chas sis Ground to Con trol Panel

To reduce the possibility of electrical interference, connect the chassis ground terminal of
the OIT 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 OIT 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 con trol panel is made of a non-con duc tive ma te rial, it is es sen tial that you con nect the
chas sis ground ter mi nal of the OIT to a clean earth ground point lo cated close to the panel.
Frame ground (marked FG)
Control Panel

Power Sup ply Se lec tion

The power supply used to power the OIT should provide an output of +24 VDC 5%
measured at the OIT power terminal block. A 24VDC regulated power supply dedicated to
the OIT is required. Use a power supply with adequate current rating for your particular
model (see specifications on our website).
Con trol Panel Ground ing
Sil ver Plus Se ries
Stud or screw
Area on panel free of paint.
1010-1006, Rev 01