Cable Routing And Noise Immunity; Power Supply Selection - Maple Systems HMI5000L Series Installation Manual

HMI5000L 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 at
least +24 VDC ±20% measured at the HMI power connector
(HMI5043DL should be powered with +10.5~28VDC only).
A DC regulated power supply dedicated to the HMI is recommended.
Use a power supply with adequate current rating for the provided
voltage. 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, a resistor
(~1 MΩ) and capacitor (~4700 pF) should be used 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.
1010-1018 Rev 12 www.maplesystems.com
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