INSTALLATION
COMPUSCALE III
The CompuScale III should be mounted in an area that is within the specified temperature range, and that is
suitable for Nema 4 style enclosures. The front cover should be accessible for keypad operation, display
viewing, and have sufficient room to swing open.
It is advisable to keep the CompuScale III away from high voltage or current runs, contactors, SCR control
drives and RF interference.
For proper totalizer relay operation, the CompuScale III must be mounted within 30° from vertical.
Refer to FIGURES.
Do not mount the CompuScale III in direct sunlight without the use of a sun shield.
INTERCONNECTION
Remove the enclosure bottom plate prior to drilling or punching cable/conduit entrance(s), to ensure metal
filings do not come in contact with the CompuScale III electronics.
Load cell or LVDT, speed sensor, rate output, communication, and low voltage contact wiring may be run in a
common conduit separated from power and high voltage contact wiring. Refer to Figures.
The power ground (TB1-50) is internally connected to SHLD connections (TB1-13,26 and TB2-5), and to the
mother board bottom mounting lugs. COM connections (TB1-15,29,32,36,37, and TB2-8) are connected to
power ground via jumper J2, (below TB1, between the mounting lugs). If the COM connections must be
isolated from power ground, remove J2.
Refer to FIGURES.
All wiring must be performed in accordance with all governing regulations.
HAZARDOUS LOCATIONS
The CompuScale III cannot be mounted in an area classed as hazardous. Where the associated belt scale is
mounted in a hazardous area, barrier strips must be used to isolate the CompuScale III from the hazardous
area for intrinsic safety. Contact Milltronics or your local representative for hazardous application information.
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PL-367
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