Sterling 882.00274.00 specifications Field Control Programming, Equation, Desired Display Setting

Field Control Programming

The standard additive feeder controller has the ability to display feed rates in units other than the factory set auger RPM display. With the proper programming, the feeder can display pounds/hour, grams/minute, etc. The non-volatile memory retains the program if the power is interrupted.

Note: The field programmer should have a basic understanding of programmable motor controls before attempting to reprogram the display. Page 32 lists the factory default settings.

WARNING! This procedure involves resetting a DIP switch within a live electrical enclosure. Only persons with the proper knowledge of and respect for working on energized electrical devices should attempt this procedure. Use extreme caution!

To program a custom feed rate display, first calculate the new constant.

Equation:

CONSTANT = 1500 X DESIRED DISPLAY SETTING

MOTOR RPM X PULSES PER REVOLUTION

Desired Display Setting

This is what you want to see on the display during operation. For example, if you are programming to display pounds/hour and you want to feed ten pounds/hour, this number would be 10.

Motor RPM = 25.2 X Auger RPM

If calibration determines that a 40 rpm auger speed delivers 10 pounds per hour, multiply 40 by the gearbox ratio [25.2:1] to calculate motor rpm, for example, 1,008.

Pulses Per Revolution = 2

The motor shaft magnet/sensor pulses twice per motor revolution.

Example 1:

Calculating a constant to display pounds per hour: If calibration (Page 20) determines that, for example, a 40 rpm auger speed feeds 10 pounds per hour, the following calculation will permit programming the display to read in pounds per hour. The constant calculated has been rounded to the desired decimal place.

Equation:

Constant = (1500 x 10) / (25.2 x 40 x 2) = 7.44

Example 2:

How the factory pre-set constant was calculated:

Equation:

Constant = (1500) / (25.2 x 2) = 30.0