Maple Systems Silver HMI504T, Installation And Operation Manual

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In stal la tion
It is necessary to follow all installation procedures described in this chapter for electrical noise immunity and CE
compliance.
Your Maple Systems OIT is designed to connect easily to your PLC. External rear connectors provide quick
connections for power, communications and programming wiring.
There are two serial ports on the rear of the OIT (except the HMI504T, which has one serial port). Both of these are
D-subminiature 9-pin connectors. Use the female connector for RS-232 communications to a PLC. Use the male
connector for RS-485 communication to a PLC and RS-232 communications to a PC.
Use the supplied separate 3-position terminal block to provide power to the OIT.
Con nect the OIT to Power
The power cable for the OIT should be 18AWG, 2-conductor wire with a shield drain wire and protective shield
foil. You may buy cable P/N 6030-0009 by the foot from Maple Systems to make these.
Always run the DC ground wire directly back to the signal return of the power supply. Do not use the chassis
ground wire as your signal return! Maple Systems recommends using an axial ferrite coil (Maple p/n 2531-0001)
with each HMI550 OIT to further reduce the electrical interference that may be conducted on the power lines.
Thread the positive and negative wires of the power cable through the ferrite coil so that the coil is no more than two
inches from the OIT’s power input.
4
To connect the OIT to power:
1. Connect the power cable to the OIT
a. Strip the power cable shield to expose 2” of the black and red wires.
b. Strip about ¼” of insulation from the black and red wires.
c. Thread the black and red wires through the ferrite core. The shield wire must be outside.
d. Connect the red wire to the DC positive (+) input of the OIT power terminal.
e. Connect the black wire to the DC negative (-) input of the OIT power terminal.
f. Connect the power cable shield wire to the OIT power terminal’s chassis ground input.
2. Route the power cable to the OIT power supply. The power cable should not be any longer
than necessary.
3. Install the power supply wires as follows (with colors shown for Maple Systems cable P/N
6030-0009):
1010-1001a, Rev 02
In stal la tion of OITs 11
OIT
(rear side)
24Vdc
power supply
Control
panel
Shield wire (bare)
Black wire (-)
Red wire (+)
Ferrite coil
24V
120Vac
Black
Shield drain
Red
FG
DC Output -V (Gnd)
DC V (+24V)
(+)
GND
(-)
OIT Power Inputs