System Planning; Sensor Installation Guidelines; Installation Guidelines For Preventing Noise - Watlow Micro-Based Autotuning Control SERIES 980/985 User Manual

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WATLOW Series 980/985 Users Manual
Chapter 2
How to Install and Wire the
Series 9801985

System Planning

This chapter tells you how to install the Series 980/985. All mounting and
wiring information is right here. Because Watlow controls are thoroughly
tested and "burned in" before leaving the factory, the Series 980/985 is ready
to install when you receive it.
But before you begin working, read through this chapter to gain an understand-
ing of the entire installation. Consider sensor installation carefully. You'll need
to look at the noise reduction guidelines before making your panel cutout.

Sensor Installation Guidelines

We suggest that you mount the sensor at a location in your process or system
where it reads an average temperature. Put the sensor as near as possible to
the material or space that you want to control. Air flow past this sensor should
be moderate. The sensor should be thermally insulated from the sensor
mounting.

Installation Guidelines For Preventing Noise

For improved electrical noise immunity, install the Series 980/985 as far away
as possible from motors, relays, and other similar noise generators.
Do not run low power (sensor input) lines in the same bundle as AC power
lines. Grouping these lines in the same bundle can create electrical noise
interference which may result in error codes in the Series 980/985.
The Culprit
Most noise problems stem from wiring practices. They're the major means of
coupling noise from its sources to the control circuit The following information
will tell you how to eliminate or decrease noise.
An Information Resource
An outstanding resource for information for wiring guidelines is the IEEE
Standard No. 518-1982 and is available from IEEE, Inc. 345 East 47th Street,
New York, NY 10017.
Install and Wire, Chapter 2