AMETEK 957 SSI Brik User Manual

Linear Displacement Transducer

Installation Manual

957SSI Brik

Series 957SSI Brik™

™

ABSOLUTE PROCESS CONTROL
KNOW WHERE YOU ARE... REGARDLESS

Contents

Chapter 1: Overview .................................... 2

Chapter 2: Installing .................................... 5

2.1 Installing to a Mounting Bracket ....... 5

2.2 Magnet Position ............................... 6

Chapter 3: Wiring ........................................ 7

3.1 Wiring Connections .......................... 7

3.2 Features ......................................... 16

3.3 Troubleshooting ............................. 16

3.4 Specications ................................. 17

3.5 Part Numbering System ................. 18

NOTE: Ametek has checked the accuracy of this manual
at the time it was approved for printing. This manual may
not provide all possible ways of installing and maintain­ing the LDT. Any errors or additional possibilities to the
installation and maintenance of the LDT will be added in
subsequent editions. Comments for the improvement of
this manual are welcome.

Ametek reserves the right to revise and redistribute the
entire contents or selected pages of this manual. All rights
to the contents of this manual are reserved by Ametek.

Unpacking

Carefully remove the contents of the shipping carton and
check each item on the packing slip before destroying the
packing materials. Any damage must be reported to the
shipping company. If you do not receive all of the parts,
contact Ametek at 800-635-0289 (US and Canada) or
248-435-0700 (International).

Most probes are shipped
in a Tube. To remove the
metal end cap, use a large,

at blade screw driver or a

metal rod and tap on the
inner edge of the cap until
it pivots. Grab the cap and
pull it out. Use caution as the edge of the metal cap may
be sharp.

Chapter 1: 957SSI Overview

The 957SSI Brik™ is a magnetostrictive Linear Displace­ment Transducer (LDT) for highly accurate continuous
machine positioning in a variety of industrial applications.

The 957SSI Brik™ provides a Serial Synchronous Inter­face output signal that is proportional to the position of the
magnet assembly along the length of the probe.

This sensor is built to withstand the most severe environ­mental conditions and is completely absolute. This means
that power loss will not cause the unit to lose position in­formation or require re-zeroing. The non-contact design al­lows this device to be used in highly repetitive applications
without mechanical wear.

Features

The 957SSI has auto-tuning capability. This is the ability to
sense a magnet other than the standard slide magnet and
adjust its signal strength accordingly.

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. When the probe is in the
normal mode of operation, the LED will remain illuminated
green continuously.

LED Colors*

Green Magnet is present and within the active range.

Red Fault, the LDT has lost its signal from the magnet or the

magnet has moved into the Null Zone or Dead Band.

*Refer to diagnostics on page 16 for a complete list of LED colors
and functions.

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 has, its output signal and
range, the type of connector the unit uses, and stroke
length. For a translation of the model number, see Sec­tion 3.5 Part Numbering System.

If you have an RMA warranty claim, pack the probe in a
shipping tube or with stiff reinforcement to prevent the
probe from being bent in transit.

2

®

1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • Phone [phone] • Fax [phone] • www.ametekapt.com

SSI (Serial Synchronous Interface)

CLOCK

DATA

SAMPLING AT

SAMPLING AT
RISING EDGE

SAMPLING
BETWEEN EDGES

SSI Sensor Input

The displacement value (position) is encoded into a 24, 25
or 26 Bit format and transmitted at high speeds. Synchroni­zation in a closed loop system is made easy. A clock pulse
train from a controller is used to shift out sensor data: one
bit of position data is transmitted to the controller for one
clock pulse received by the sensor. The absolute position
data is continually updated by the sensor and converted
by the shift register into serial information.

SSI Logic Diagram

SSI Clock (+)

SSI Clock (-)

Position Measurement

Output Data Format Conversion

Input
Power
Supply

SSI Shift Register and Controller

SSI Data (+)

SSI Data (-)

+7 to 30 V

0V

+5V

RS-422

RS-422

Input
Power
Supply

4.7KΩ

470Ω

4.7KΩ

SSI Timing Diagram

Clock (+)

Data (+)

12V 12V

12V 12V

33V

Ferrite

Filter

10Ω

SSI Clock (+)

10Ω

SSI Clock (-)

10Ω

SSI Data (+)

10Ω

SSI Data (-)

Power Supply (+)

Common

Clock Interval

LSBMSB

Min. 16 µs

Note: Based on Gemco cable P/N 01533149 (Turck P/N RF50610-30M).

New data is placed on the "data" signal 605nS after the rising edge of the "clock" signal. This time, plus the data caused
by cable length, must be considered when determining the setup times (frequency) of the controller.

1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • Phone [phone] • Fax [phone] • www.ametekapt.com

®

3

957SSI Brik™ with Magnet Sensor

Figure 1-1 957SSI Dimension Drawing for Reference

Figure 2-1 Mounting Bracket (SD0522000)

4

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1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • Phone [phone] • Fax [phone] • www.ametekapt.com

Chapter 2: Installing the LDT

Units can be ordered in span lengths up to 180 inches
long in .1 inch increments. The optional slide magnet is de­signed to move effortlessly along the transducer in guide

tracks, or the standard oating 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 957 Brik™ 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.

Mounting

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.

Magnet Assembly

Magnet choices are the Floating Magnet or the 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.

1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • Phone [phone] • Fax [phone] • www.ametekapt.com

®

5

2.2 Magnet Position

The sliding magnet is designed to move along the extrusion.
The magnet can be slide mounted (Part # SD0521801) or

top mounted (Part # SD0521800). Refer to gure 2-2.

Figure 2-2 Magnet Sensor

6

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1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • Phone [phone] • Fax [phone] • www.ametekapt.com