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4 Wiring Instructions
Electrical noise is a phenomenon typical of industrial environments. As with any
instrumentation, these guidelines should be followed to minimize the effect of noise.
Installation Considerations
Ignition transformers, arc welders, mechanical contact relays and solenoids are all common
sources of electrical noise in an industrial environment and therefore the following guidelines
MUST be followed.
1. If the instrument is being installed in existing equipment, the wiring in the area should be
checked to ensure that good wiring practices have been followed.
2. Noise-generating devices such as those listed should be mounted in a separate
enclosure. If this is not possible, separate them from the instrument, by the largest
distance possible.
3. If possible, eliminate mechanical contact relays and replace with solid-state relays. If a
mechanical relay being powered by an output of this instrument cannot be replaced, a
solid-state relay can be used to isolate the instrument.
4. A separate isolation transformer to feed only the instrumentation should be considered.
The transformer can isolate the instrument from noise found on the AC power input.
AC Power Wiring - Neutral (for 100 to 240V AC versions)
It is good practice to ensure that the AC neutral is at or near ground (earth) potential. A
proper neutral will help ensure maximum performance from the instrument.
Wire Isolation
Four voltage levels of input and output wiring may be used with the unit:
1. Analogue input or output (for example thermocouple, RTD, VDC, mVDC or mADC)
2. Relays & Triac outputs
3. SSR Driver outputs
4. AC power
CAUTION:
The only wires that should run together are those of the same category.
If any wires need to run parallel with any other lines, maintain a minimum space of 150mm
between them.
If wires MUST cross each other, ensure they do so at 90 degrees to minimise interference.
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Connections
- DIN Controllers & Indicators - Product Manual
59305, Issue 5 – March 2005
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