Mitsubishi MR-508XL Spezifikationen PDF herunterladen (Seite 10)

7.10

Bimba Position Feedback Cylinders

How it Works

The Bimba Position Feedback Cylinder contains

a Linear Resistive Transducer (LRT) or potentiom-

eter mounted in the cylinder rear head. The LRT

probe, which has a resistive element on one side

and a collector strip on the other, is inside the

cylinder rod. A wiper assembly is installed in the

piston. As the piston moves, an electrical circuit is

created between the resistive element and collec-

tor strip. A variable resistance (approximately 1KΩ

per inch of stroke) proportional to piston position in

the cylinder is produced by the cylinder.

The cylinder can be easily setup to produce an

analog signal compatible with 0-10 VDC PLC ana-

log inputs.

The accuracy of an LRT is determined by three fac-

tors: resolution, linearity and repeatability.

Resolution refers to the smallest change that

can be detected on the LRT. The Bimba LRT has

infinite resolution, and can be divided into as many

parts as the electronics allow. For example, with

a 12-bit, 4096-part controller, the stroke could be

divided into 4096 parts. When 10 VDC are placed

on a 10" cylinder, the smallest detectable incre-

ment would be 10 VDC ÷ 4096 = 2.4 millivolts or

0.0024". Resolution is stroke sensitive, i.e., the

longer the stroke, the less resolution.

Linearity refers to the maximum deviation of the

output voltage to a straight line. The Bimba LRT’s

linearity is ± 1 percent of stroke.

Repeatability

is the ability of the LRT to pro-

vide the same output voltage relative to a unique

cylinder position each time the cylinder is cycled.

Mechanical repeatability of the Bimba Position

Feedback Cylinder is ± 0.001".

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Mitsubishi MR-508XL Spezifikationen Seite 10