Chapter 1: Hardware Overview - Ametek Gemco Brik 955QD Series Installation, Programming And Maintenance Manual

Chapter 1: Hardware Overview

Chapter 1: Hardware Overview
The Series 955QD Brik with Quadrature Output is an accurate, auto-tuning, non-contact, linear displacement
transducer in an economical, low prole package. The transducer utilizes our eld proven magnetostrictive
technology to give absolute position, repeatable to .01% of the programmable sensing distance. The
streamlined anodized aluminum extrusion houses the sensing element and electronics. The magnet moves
over the sensing element that determines the position and converts it to incremental outputs.
The 955QD has a truly unique feature. The 955QD LDT has auto-tuning capability, the ability to sense
a magnet other than the standard slide magnet and adjust its signal strength accordingly. See chapter
3.5 (Features).
There is an indicator LED that is located at the connector end of the probe and provides visual status
information regarding the operation of the probe. Green indicates proper or normal operation. Red indicates
the loss of the magnetic signal or a probe failure. The LED ashes yellow/red or yellow/green when it is in the
AGC (Automatic Gain Control) mode. This is a special setup mode used to calibrate the probe for the magnetic
eld of the magnet in the oating magnet assembly or ring magnet of a cylinder. When the probe is in the
normal mode of operation, the LED with remain illuminated continuously.
Green: Magnet is present and within the active
programmed range.
Red: Fault, the LDT has lost its signal from the
magnet or the magnet has moved into the
Null or Dead zone.
Yellow: Used when setting ACG, yellow appears in short bursts combined with either red or green
when in the AGC mode
NOTE:
The series number on your LDT is a record of all the specic characteristics that make up
your unit. This includes what interface type it is, its output signal and range, the type of
connector the unit uses, and stroke length. For a translation of the model number, see
Section 3.8: Catalog Numbering System.
The 955QD Brik with Quadrature Output is a linear displacement transducer. It provides an A quad B digital
output signal that is proportional to the position of the slide magnet assembly along the length of the probe.
The quadrature output makes it possible to have a direct interface to virtually any incremental encoder input
or counter card, eliminating costly absolute encoder converters and special PLC interface modules.
The 955QD Brik with Quadrature Output LDT can be ordered with 1 to 9999 cycles per inch of output
resolution. The transducer features an input to re-zero the probe "on the y". Another unique feature is
the "Burst" mode; an input on the transducer triggers a data transfer of all the incremental position data
relative to the transducer's absolute zero position. This is how incremental can provide absolute functionality.
The "Burst" input can be used to achieve absolute position updates when power is restored to the system or
anytime an update is needed to re-zero or home the machine without having to move the machine.
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Installation, Programming and Maintenance Manual