Maple Systems RMI5001 Installation Manual page 5

RMI5001 Installation Guide
Cable Routing and Noise Immunity
Follow these guidelines when routing cables to the HMI:

Always route the HMI communication cable and the power cable
away from any AC voltage or rapidly switching DC control lines.

Never bundle the HMI cables together with 120VAC power wires
or with relay wiring.

Try to keep at least 8 inches (20 cm) of separation between the
HMI cables and other power wiring. If voltages greater than
120VAC are used in the system, greater separation is required.

If the HMI 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 HMI 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.
Power Supply Selection
The power supply used to power the HMI should provide an output of
+24 VDC ±20% measured at the HMI power terminal block. A 24VDC
regulated power supply dedicated to the HMI is recommended. Use a
power supply with adequate current rating based upon your particular
model (visit the Support Center Specifications page on our website).
A power line filter installed at the AC input to the HMI 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. In applications that may have high
frequency noise present, we also recommend using a resistor (~1 MΩ)
and capacitor (~4700 pF) in parallel to clean earth ground on the DC
output of the power supply.
Do not use the power supply used to provide power to the HMI to power
switching relays, solenoids, or other active devices.
1010-1019 Rev 04 www.maplesystems.com
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