AMETEK 955 eBrik - Manual (Page 2)

955 eBrik™
L INEAR D ISPLACEMENT T RANSDUCER
“Know where you are...Regardless...”
ABSOLUTE CONTROL IN THE WORLD OF AUTOMATION
The transducer can be mounted vertically or horizontally using the supplied
SD0522000 mounting brackets. The mounting brackets slide in the grooves
on the lower part of the extrusion and clamp down when tightened. It is
recommended to use one mounting bracket on each end and every three
feet between.
Ferro-magnetic material, which is material readily magnetized, should be
placed no closer than .25” from the sensing surface of the LDT.
In building the part number you selected the desired magnet assembly
and programmability option. Magnet choices were the Floating Magnet
or Slide Magnet assemblies. When using the Floating Magnet assembly
SD0551500, the magnet should be installed within ¼” of the sensing
surface. The magnet assembly should also be installed in such a manner
that it remains an even distance from the aluminum extrusion throughout
the entire stroke. Improperly installed magnets can result in output signal
non-linearity, or loss of Magnet signal.
The 955 eBrik™ is an accurate programmable, auto-tuning, noncontact,
linear displacement transducer in an economical, low profile package. The
transducer utilizes our field proven Magnetostrictive technology to give
absolute position, repeatable to 0.001% 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 an analog output. The transducer
can be ordered with 0 to 10 VDC or 4 to 20 mA output. All units are provided
with a standard 5 pin 12mm Euro Micro connector.
Units can be ordered in span lengths up to 72 inches long in 1 inch
increments. The optional slide magnet is designed to move effortlessly along
the transducer in guide tracks, or the standard floating magnet assembly can
be positioned up to 1/4” above the unit. A variety of hardware is available for
attaching the magnet slide to the moving portion of the process.
The 955 eBrik™ has a few truly unique features. One feature is the LDT’s
auto-tuning capability, the ability to sense a magnet other than the standard
slide magnet and adjust its signal strength accordingly. Another optional
feature is that the analog output is programmable over the entire active
stroke length. The active stroke area of the LDT lies between the Null and
Dead zones.
The 955™ eBrik™ LDT offers a unique diagnostic capability. The normal
analog output indicates the position of the magnet within the programmed
Span. If the magnet moves beyond the programmed Zero & Span positions,
the analog output will be either 3.9mA or 20.1mA for current models and
-.1VDC or 10.1VDC for voltage output models. If there is a loss of magnet,
the output will be 3.8mA on current units and 10.2VDC on voltage units.
Once the LDT has been installed, wiring connections can be made. The
955 eBrik™ uses an industry standard 5 pin 12mm Euro style cordset with a
shield, tied to the coupling nut. To reduce electrical noise, the shield must be
properly used. Connect the cable’s shield to the controller system Ground.
The cable shield is connected at the connector end. Always observe proper
grounding techniques and isolate high voltage (i.e. 120/240VAC) from low
voltage (24 VDC cables).
Warning: Do not use molded cordsets with LEDs!
It is preferable that the cable between the LDT and the interface device be
one continuous run. If you are using a junction box, it is highly recommended
that the splice junction box be free of AC and/or DC transient-producing
lines. The shield should be carried through the splice and terminated at the
interface device end.
NOTE: When grounding the LDT, a single earth ground should be connected
to the Power Supply Common (circuit ground). The LDT Power Supply
Common should be connected to the Power Supply Common (-) terminal.
The LDT power supply (+VDC) should be connected to the power supply
positive terminal (+). The LDT cable shield should be tied to earth ground
at the power supply. The LDT analog common should not be connected to
earth ground and should be used for connection to interface devices only.
The power supply should be dedicated to the LDT to prevent noise and
external loads from affecting it. When powering up more than one LDT on a
single power supply, each unit will draw approximately 1.1 watts.
The LDT generates an analog output based on position. The 955 eBrik ™
offers 16-Bits of resolution, and if the optional was ordered, is fully
programmable over the entire active stroke length. Keep in mind that there
is a 2.75” Null Zone at the connector end of the LDT and a 2.75” Dead Band
at the other end of the LDT that the magnet must stay out of at all times.
The units come fully programmed from the factory and do not require re-
programming unless desired. The analog output is referenced to the analog
common terminal and should not be referenced to any of the other common
terminals.
Mounting
Magnet Assembly
Introduction Wiring