Measurement Cutoff - Ohmart Vega W-4510 Technical Reference Hardware Manual

Weigh scale with gen 2000 electronics model / with frequency output

Table of Contents

Setup

Measurement cutoff

Some belt scale applications have the belt scale running empty for prolonged periods. If there

is a buildup of product sticking to the belt, the gauge measures and totalizes this product

when the not actually receiving the product. The measurement cutoff feature turns the

measurement off in the frequency input block when the measurement drops below a setpoint.

The Measurement Cutoff Setpoint is entered in Standardize Compensated Counts.

Note

The setpoint is entered as counts above the zero point. The gauge keeps track of the zero

point, you enter the counts. For example, if the cutoff should trigger at 20 counts above the

cutoff, enter 20 in the setpoint location.

Some applications have a large noise factor or very light loading. This makes it hard to

distinguish between an empty belt and a low product. The Cutoff Time Constant feature

provides for those cases requiring filtering of the raw counts used to trigger the cutoff

function. This filtering is independent of the measurement process and does not affect the

measurement in any way. As the Cutoff Time Constant is raised, the noise factor is reduced

and the cutoff response time is increased. A Cutoff Time Constant entry is required if using

the Measurement Cutoff feature. An entry of 1 gives the fastest response just as in the

normal measurement time constant entry. The Measurement Cutoff function will not operate

with an entry of zero for the Cutoff Time Constant.

Note: The cutoff time constant should be set as low as possible while still getting reliable

cutoff indications.

When the measurement is actually cut off, there are two indications of the condition. The

measurement processing in the frequency Input block will be zeroed from the normalized

count location on and the Cutoff Flag will contain a one. The Cutoff Flag will be zero with the

channel is in normal operation. You can use the Cutoff Flag to set an alarm, indicate an "end

of batch", and so forth.

Refer to page 130 for the Frequency Input Block locations.

W-4510 Weigh Scale Technical Reference Manual

Table of Contents