Sterlco M2B+ Controller - Manual (Page 19)

Advanced Microprocessor Controller
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Chapter 3: Installation
3-1 Location
Mount the instrument in a location that will not be subject to excessive temperature, shock or
vibration. All models are designed for mounting in an enclosed panel.
When properly mounted in an enclosed panel using a gasket at the panel/controller interface,
the keypad can be washed down with water. Do not use high-pressure fluids.
3-2 Electrical Connections
Microprocessor-based instruments require a “clean” source of power that is steady and free of
noise. Electrical noise may be caused by line faults, power switching, motors, motor
controllers, or power controllers containing SCR devices. Without a clean source, any
microprocessor is prone to failure. If your power source is not from a clean line, your system
can be protected by installing a line filter.
Where external contactors or solenoids are used with relay output instruments, an R/C
Snubber Network should be used. The snubber installs easily directly across the field coil
terminals of the relay or solenoid.
Do not run thermocouples, RTD’s or other class 2 wiring in the same conduit or area as the
power leads. Maintain separation between wiring of sensors, process signals and other power
and control wiring.