West Control Solutions ProVU 4 - Manual (Page 23)

ProVU4 Controller, Profiler & Recorder/Controller - Product Manual
Page 22 Wiring Instructions 59407, Issue 1 – March 2008
4 Electrical Installation
CAUTION:
Installation should be only performed by technically competent personnel. It is the
responsibility of the installing engineer to ensure that the configuration is safe.
Local Regulations regarding electrical installation & safety must be observed (e.g.
US National Electrical Code (NEC) or Canadian Electrical Code).
Installation Considerations
Ignition transformers, arc welders, motor drives, mechanical contact relays and solenoids are
examples of devices that generate electrical noise in typical industrial environments. The
following guidelines MUST be followed to minimise their effects.
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.