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.

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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

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3

957SSI Brik™ with Magnet Sensor

Figure 1-1 957SSI Dimension Drawing for Reference

Figure 2-1 Mounting Bracket (SD0522000)

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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.

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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

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Chapter 3: Wiring

!

3.1 Wiring Connections

Once the LDT has been installed, wiring connections can
be made. There are two groups of connections you will
need to make. They are as follows:

• Power Supply Connections (including ground and
shield)

• LDT Input/Output Connections

Power Supply/Ground Connections

The 957SSI is available with many different connector/wir­ing options. Refer to part numbering on unit in question
for proper wiring. See Section 3.5 for part numbering and

gures 3.3 - 3.8 for wiring details.

The 957SSI standard cable is a 6 Pin, 12mm, cordset.
It has 6 conductors of 24ga, with an aluminum/poly­ester/aluminum foil with drain wire plus an over­all braid of tinned copper shield. Cable O.D. is .23
(5.7mm ). To reduce electrical noise, the shield must be
properly used. Connect the cable’s shield to the controller
system GND.

In order for the 957SSI to operate properly, the LDT’s ex­ternal power supply must provide a voltage between +7
to +30 VDC. The power supply must be rated at 150mA
minimum. The power supply should provide less than 1%
ripple and 10% regulations. (The power supply should be
dedicated to the LDT to prevent noise from external loads
from affecting the position readings.)

Cable lengths

AMETEK recommends that the maximum cable length be
10 meters. Cables greater than 33 feet are available; how­ever, proper care must be taken during installation.

Any extension to the existing cabling should be mount­ed in a junction box free of any other cabling, the cable
should be a twisted shielded pair with a braided shield.
The shield should pass straight thru this enclosure and not
tied to ground. When grounding the LDT, a single earth
ground should be connected to the power supply common.
The LDT power supply common should be connected to
the power supply common (-) terminal. The LDT’s shield
should be tied to the earth ground at the power supply.

Cable length limitations are based on SSI clock fre­quencies. Apply good industry practices for long cable

runs - keep cable away from high power AC lines and all
motor drive cables.

Always observe proper grounding techniques such as sin­gle point grounding and isolating high voltage (i.e. 120/240
VAC) from low voltage (7-30 VDC cables). Whenever pos­sible, this cable should be run in conduit by itself. The
power supply common, the cable shield and a good earth
ground should be connected together at the location of

the power supply common. See gure 3-1 Power Supply

Wiring.

WARNING Do not route the Brik™
output cable near high voltage
sources.

UNIPOLAR

Single ended
power supply

+7 to +30 VDC

+ COM

Power+ Common

Figure 3-1 Power Supply Wiring

Controller Data Sampling

Cable Length

6 ft 1.83 m 750 kHz 1500 kHz

30 ft 9.14 m 650 kHz 1300 kHz

100 ft 30.48 m 500 kHz 1000 kHz

150 ft 45.72 m 400 kHz 800 kHz

300 ft 91.44 m 270 kHz 540 kHz

600 ft 182.88 m 160 kHz 320 kHz

1200 ft 365.76 m 90 kHz 180 kHz

Falling

Edge

Rising Edge

Cable Connectors

The 975SSI is available with various cable connection op­tions. See gure 3-2 for standard options. Should a differ­ent connector be required for an application, please con­tact the factory at 800-635-0289.

Note: Minimum SSI clock frequency rate is 70 kHz.

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

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Figure 3-2 Standard Cable Connector Options 957SSI

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Startup

1. Verify connections

The 957SSI is reverse polarity protected; however, com­ponents can be damaged from improper connections or
over voltage. Before applying power verify connections
are correct.

2. Turning on power

Note that the system may execute uncontrolled movement

when power is rst applied when the 957SSI is part of a

closed loop system whose parameters have not yet been

congured.

Position Update

The position of the magnet on the extrusion is precisely
determined by a time of ight method. The 957SSI con­verts this position value to a 24, 25, or 26 bit Binary or
Gray code data stream where it is transmitted to the host
controller via SSI. All displacement outputs are absolute
and do not lose their position after loss of power.

Position update frequencies are available up to 6500
measurements per second (Length dependant) in Asyn­chronous mode, and are controller dependant in the Syn­chronous mode. However, if the controller interrogates
the 957LDT quicker than the LDT can provide data, the
957SSI Brik™ LDT will automatically switch to the Asyn­chronous mode and supply the host controller with the
most up to date positional information.

NOTE: The data in this mode will always be one update
cycle old.

Asynchronous Update Mode

The 957SSI Brik™ LDT takes measurements at its preset
internal interrogation rate (length dependant) and provides
information when requested from the host controller.

NOTE: If the controller or interface module does not spec­ify Synchronous mode, we recommend using the LDT in
the Asynchronous mode.

Direction

The 957 can be congured increasing, decreasing, posi­tion, or velocity. Option “F” (Measure Direction Forward)
will increase counts as the magnet moves from the head
of the LDT to the tip. Option “R” will be exactly opposite.
The zero position will be located at the end of the blue
housing. This is an area where it is physically impossible
to detect a magnetic signal. If the 957SSI is in the “Mea­sure Direction Reverse” option, the zero point will be at the
far tip of the LDT, again a position that the magnet cannot
be detected. If the velocity option is selected, the unit will
output velocity and not displacement.

Synchronous Update Mode

A clock pulse train from the host controller is used to shift
out sensor data, one bit of positional data is transmitted
to the controller for each clock pulse received by the sen-

sor. The rst clock pulse edge from the host controller

signals the LDT to make a measurement. The positional
data from this measurement will be used during the next
controller update cycle.

SSI Clock

Controller

Update

Synchronous

Asynchronous

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Update

Position

Internal

Repitition

Update

Position

Update

Position

Update

Position

Update

Position

Update

Position

Update

Position

Resolution

The resolution of the positional output is selectable in the
part number and can be ordered in English (Imperial) or
metric units. Selections 1 thru B are valid options. Refer
to section 3.5 Part Numbering for further details.

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Figure 3-3: Wiring for Connector

Option "S", 6 Pin 12 mm

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Figure 3-4: Wiring for Connector

Option "C", Integral Cable Assembly

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Figure 3.5 Wiring Diagram

Option "H", High Temperature Integral

Cable Assembly

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Figure 3-6:

Wiring for Connector

Option "E", 10 pin MS connector

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Figure 3-7:

Option "M", 7 Pin DIN

Wiring for Connector

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Figure 3-8: Wiring for Connector

Option "B", 8 Pin DIN

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3.2 Features

3.3 Troubleshooting for 957SSI

Automatic Gain Control

The Automatic Gain Control feature will automatically
search and nd the magnet on power up. If power is ap­plied without a magnet on the LDT, the LED will turn RED
indicating no magnet signal is detected. Turn power off
and place magnet within the active stroke area. Re-apply
power.

Accessories

P/N Description

949029L6 6 Foot, 6 Pin, Straight, 12mm Cable

949030L6 6 Foot, 6 Pin, Right Angle, 12mm Cable

SD0554600L6 6 foot, 8 Pin, Straight Cable, for Option B

SD0558500L6 6 Foot, 7 Pin, Straight Cable for Option M

SD0521800 Slide Magnet, Top Swivel

SD0521801 Slide Magnet, Top Swivel

SD0551500 Large Floating Magnet

SD0522000 Mounting Foot

Consult factory for complete accessory offerings.

Diagnostics

The 957SSI is equipped with a tri-color LED next to the con­nector to help while troubleshooting. The chart below ex­plains the possible LED colors and the faults they represent.

If there is ever a loss of magnet, the LED will turn red and
the unit will transmit a position of zero.

Troubleshooting describes common problems that may
occur when installing the LDT and offers possible solu­tions to these problems. If, after reading this appendix,
you are unable to resolve a problem, contact our techni­cal support department at 800-635-0289.

General Checks

Make sure that the magnet is located within the LDT’s ac­tive stroke area. Magnet assemblies should be positioned
so that they can move freely over the entire area of the
active stroke without binding.

NOTE: Ferromagnetic material (material readily mag-
netized) should be located no closer than 0.25” from the
sensing surface of the LDT. This includes mounting brack­ets, magnet spacers, magnet brackets, and mounting
screws. Ferromagnetic material can distort the magnetic

eld, causing adverse operation or failure of the LDT.

Check all LDT wires for continuity and/or shorts. 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.

Power Supply Check

957 LED Output Summary

Output 957SSI

Flashing Red Flash memory corrupt

Flashing Red/Green EE memory corrupt

Flashing Yellow Communication/programming mode

Fast Flashing Yellow Clock input held asserted at power up

Solid Red No magnet signal detected

Green/Red Blip
(1s to 0.12s)

Solid Green Normal probe operation; magnet signal

Solid Yellow No SSI clock pulses detected

Yellow/Red Blip
(1s to 0.12s)

Green/Yellow Blip
(1s to 0.12s)

Max Gain but signal detected and within range

and SSI clock operational

SSI clock pulses do not match
LDT SSI data length

LDT data not Synchronous with controller
(if LDT is programmed for Synchronous mode)

Alarm Bit

The 957SSI can be congured to output a fault bit

should there be a problem with the LDT.

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This will help you to determine if your power supply is
adequate for the LDT to operate properly, or if the LDT’s
cable has a short or open.

In order for the 957SSI to operate properly, the external
power supply must provide a voltage level between 7 to 30
VDC. A power supply providing voltage above this speci-

ed range may damage the LDT. A power supply provid­ing power below this specied range will not be sufcient

to power the LDT. When powering more than one Brik™
on a single power supply, remember that each Brik™ typi­cally requires 1.3 watts of power. The amount of current
draw will vary based on the input voltage, as well as other
operating parameters. To approximate the current draw
for a particular LDT, divide the LDT wattage by the input
voltage. For example, 1.3 watt divided by 24 VDC equals
55mA.

If your LDT is not operating properly, the LDT’s cable may
have an open or short, or the power supply is not supply-

ing sufcient power. To verify this, perform the following

steps:

1. Turn the power supply off.

2. Remove the mating connector from the LDT.

3. Turn the power supply on.

4. Using a digital voltmeter, check from the Power Sup­ply Common to the Power Supply + on the mating
end of the cable for a level between +7 and +30
VDC.

If reading is between 7 and 30 VDC, turn power supply off
and go to step 7. If reading is below 7 VDC, either your
power supply is not providing enough power or the LDT’s
cable possibly has a short/open. Readings of no voltage
or minimal voltage (less than 5 volts) may be due to short/

5. Turn the power supply off.

6. Check the continuity of the individual wires of the
cable between the power supply and the LDT. Check
for continuity from one end of the cable to the other.
Also verify that no shorts exist between pins.

7. Reconnect the mating connector to the LDT.

8. Turn power supply on.

9. Using a digital voltmeter, check the power supply’s
“+” and “-” terminals for a voltage between 7 and 30
VDC.

Low voltage readings may indicate a power supply with a
wattage (current) rating that is too low. (Each LDT requires
approximately 1.3 watts). If the cabling checks out in step
6 and your voltage is below 7 VDC, check your power sup­ply current rating. If voltage is between 7 to 30 VDC and

the LDT is still inoperative, contact factory.
open in the cable. If reading is NOT between 7 and 30
VDC, go to step 5. If reading is above 30 VDC, adjust pow­er supply or replace.

* See Section 3.4: Specications for more information on

power consumption.

3.4 Specications

Specications

Connector Interface 6 Pin 12mm

Integral cable ass'y, 7 Pin or 8 Pin
DIN

Displacement 1” to 180" Vibration 30 Gs

Dead Band 2.65" (67.31 mm) standard Update Time Measuring Length 300 750 1000 2000 5000mm

Null Zone 2.00" (50.8 mm) standard Approvals CE (EMC) Non-linearity < 0.01% or +/- 0.005”, whichever

Enclosure Rating IP67, IEC 600529 Input Voltage 7 to 30 VDC Diagnostics Tri-Color LED beside connector/

Measured Variables Single Magnet Displacement, Consult

Factory for Velocity or Differential
Operation

Shock 1000 Gs

Current
Draw

IEC 60068-2-27

IEC 60068-2-6

Measurements/sec. 4.0 2.4 2.0 1.1 0.5k

1.3 watts, (53mA at 24 VDC) typical* Operating

Output Type 24, 25 or 26 Bit, Binary or Gray

Code (optional parity and error
bit), Position Updates

Resolution English or Metric Units

Metric: 1, 5, 10, 20 micron (5
micron standard)
English: .00005", .0001", .0005",
.001"
Consult Factory for Others.

Hysteresis 0.008”

is greater, (+/- 0.003" Typical)

cable exit, See 'LED Output Sum­mary Table' on page 13

Temperature -40° to 185° F ( -40° to 85° C)

Interface Specica­tions Input SSI Clock

Output Data Pulse
Resistance

SSI Clock Frequency Minimum 70 kHz Maximum 150 kHz

NOTE: Specications subject to change and are based on a typical 48” stroke. *1.3 watt typical at 1ms interrogation time. Faster interrogation times increase power consumption.

RS-422, 470 Ohm termination
resistance

RS-422, 2.0V min. @ 100 Ohm
termination

Storage
Temperature

Repeatability Equal to Output Resolution

-40° to 221° F
(-40° to 105° C)

Cable Specications

Cable Type Gauge Jacket Temp Bend Radius

Connector Options "S", "M", "B", "C" 24 PVC -50° to 105° C Moving Applications - 2.36"

High Temp Integral Cable "H" option 22 Teon -70° to 200° C Moving Applications - 4.6"

Connector Option "E" 22 Polyurethane -50° to 105° C Moving Applications - 2.3"

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Fixed applications - 1.18"

Fixed applications - 2.3"

Fixed applications - 1.2"

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3.5 Part Numbering System

Brik

Extrusion

VP957 0120 1

Units of Measure

Output Type

S SSI

Stroke Length

1" to 180". Insert stroke length to 0.1 inch. Enter as
a four-place number. Example: A 12.0” stroke enters
as 0120.
OR
Insert stroke in millimeters to 5mm. Enter as a four­place number. Example: 305mm stroke entered as
0305M.

E Inches

M Metric

Connector Option

S Standard M12 6 Pin

Integral Cable Assembly. Insert length

C_

in feet. Example: C6 = 6 foot cable. *

M 7 Pin DIN, MTS Style D70

B 8 Pin DIN, Balluff S32

High Temp., Integral cable assembly

200° C Teon Cable. Insert length

H_

in feet.

Example: H6= 6 foot High Temp Teon

Cable.

Environmental 10 Pin MS connector

E

compatible with SD0439700 cable
assemblies

* If stroke is in inches, cable is in feet.
If Stroke is in metric, cable is in
meters.

SS

Data Length

1 24 Bits

2 25 Bits

3 26 Bits

Data Format

B Binary

G Gray

Position Update

S Synchronous

A Asynchronous

Direction

F Measures Direction Forward

R Measures Direction Reverse

V Velocity

B

S

F

1

Options

X None

A

Resolution

1 .005mm

2 .01mm

3 .05mm

4 .1mm

5 .02mm

6 .002mm

7 .001mm

8 .00005"

9 .0001"

A .0005"

B .001"

NOTE: Contact our Technical Support at 1-800-635-0289 for custom congurations.

XE

Alarm Bit 25,
Parity 26

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Part Number
Serial Number
Purchase Order Number
Sales Order Number

Comments

NOTES:

Other Products

®

MADE IN AMERICA

Copyright 2013 by AMETEK AUTOMATION & PROCESS TECHNOLOGIES. All Rights Reserved. Made in the USA.

1080 North Crooks Road, Clawson, MI 48017
Phone: [phone] Toll Free: 800-635-0289
Email: [e-mail] Web: www.ametekapt.com

957.M0R

10/13.Z400