If the control panel is made of a non-conductive material, it is essential that you connect the chassis ground terminal of the
OIT to a clean earth ground point located close to the panel.
Power Supply Selection
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 (refer to
Appendix A: Specifications
for the input
current requirements).
The power cable for the OIT 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 OIT
to Power
section for more information.
A power line filter installed at the AC input to the OIT 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 1 Amp with
common mode and differential mode attenuation.
1010-0300, Rev 02
10
Blue Series Installation & Operation Manual
BLU300
(rear side)
Stud or screw
Control panel
(connected to
earth ground)
Area on panel
free of paint
Shielded DB9P
male connector
+24V
0V
+ -
BATTERY
EXTENSION
PORT
RS
-485
OIT Chassis Ground Connection
