AMETEK 952 BlueOx LDT User Manual

INSTALLATION MANUAL

INEAR

ISPLACEMENT

RANSDUCERS

952 BlueOx

Linear Displacement Transducer

Series 952

Series 956

ABSOLUTE PROCESS CONTROL KNOW WHERE YOU ARE... REGARDLESS

Contents

Chapter 1: Overview

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

1.1 Dimension Drawing for all 952 LDTs ..................................3

Chapter 2: Installing the LDT ....................................................4

2.1 Installing the LDT to a Mounting Bracket ............................4

2.2 Installing the LDT in a Hydraulic Cylinder ...........................5

Chapter 3: 952 Wiring (A, CP, RS, VP, VPI) .............................8

3.1 952 Analog - V0, V1, V4 or V5 (Voltage) ............................9

3.2 952 Analog - C4 or C2 (Current)........... .................. ...........9

3.3 952 Analog - D0 or D1 (Differential Analog Output) ............9

3.4 952 Analog Wiring ............................................................10

3.5 952A (Analog) ..................................................................11

3.6 952 CP (Control Pulse) .....................................................11

3.7 952 VP (Variable Pulse) ...................................................12

3.8 952 RS (Start/Stop) ..........................................................13

3.9 952 CP, RS, VP Wiring .....................................................14

3.10 Setting Zero & Span Position (Analog Only) ..................15

3.11 Differential Analog Output (Options D0, D1, or D2) ........15

Chapter 4: 952 QD Overview .................................................16

4.1 Quadrature Output............................................................16

4.2 Signal Connection Application Note .................................16

4.3 Quadrature Output Resolution and Speed .......................18

4.4 952 QD Wiring Connection ...............................................18

4.5 Features ...........................................................................19

4.6 952 QD Wiring Diagram ...................................................20

4.7 952 QD Frequency ...........................................................23

Appendix A: Troubleshooting ..................................................24

A.1 Troubleshooting for 952 Analog LDTs ..............................24

A.2 Troubleshooting for 952 Analog LDTs ..............................26

A.3 Troubleshooting for 952 CP, RS, or VP LDTs ..................27

Appendix B: Ordering Information ..........................................29

B.1 Analog Part Numbering ....................................................29

B.2 Digital Part Numbering .....................................................30

B.3 Quadrature Part Numbering .............................................31

Appendix C: Specications .....................................................32

Glossary .................................................................................34

NOTE: AMETEK has checked the accuracy of this manual at the time it was approved for printing. However, this manual may not provide all possible ways of installing and maintaining the LDT. Any errors found in this manual or additional possibilities to the installation and maintenance of the LDT will be added in subsequent editions. Any comments you may have for the improvement of this manual are welcomed.

The GEMCO Model 952 BlueOx is a Magnetostrictive Linear Displacement Transducer (LDT). Each LDT offers highly accurate position sensing. The BlueOx LDT is built to withstand the most severe environmental conditions. The 952 digital and analog LDTs are completely absolute. Power loss will not cause the unit to lose position information or require re-zeroing. Also, the noncontact design allows this device to be used in highly repetitive applications without mechanical

wear.

NOTE: The series number on the LDT is a record of

all the specic characteristics that make up the unit.

This includes what interface type it is; its wire speed (for digital LDTs); its output signal and range; the type of connector the unit uses; and stroke, null and dead band lengths. For a translation of the model number, see Appendix B: Ordering Information.

The GEMCO 952 QD BlueOx is a magnetostrictive Linear Displacement Transducer (LDT) for continuous machine positioning in a variety of industrial applications. 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 952 QD BlueOx quadrature 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 rezero or home the machine.

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. BlueOx is a registered trademark of GEMCO.

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1.1: Dimension Drawing for all 952 LDTs

Drawing D0234200

Figure 1-1: BlueOx Linear Displacement Transducer

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Chapter 2: Installing the LDT

Before installing the LDT, the following should be considered:

• If a mounting bracket is used that is made of

ferromagnetic material (a material readily magnetized), it should be placed no closer than

0.25" from the LDT's rod end.

• To minimize the effects of magnetic ux distortion

(which could cause an inaccurate measurement of the magnet’s position), ferromagnetic material should not be placed closer than 0.25” from the magnet.

2.1: Installing the LDT to a Mounting Bracket

Perform the following steps to install the LDT to a mounting bracket. Parts discussed in this section

are found in Figure 1-1. If the LDT is being installed into a hydraulic cylinder, refer to Section 2.2: Installing the LDT in a Hydraulic Cylinder.

1. Unscrew the LDT’s jam nut from the threads protruding from the hex mounting base.

2. Insert the LDT’s rod end into the mounting bracket’s hole. The mounting bracket may

contain a 3/4 − 16 UNF − 2B threaded hole. In

this case, screw the LDT into this hole using the threads protruding from the hex mounting base.

3. Once the LDT is in place, screw the jam nut back onto the threads of the hex mounting base. Use the 1.75" hex mounting base on the head assembly to tighten the LDT to the bracket.

WARNING: Do not use the blue aluminum cover of the head assembly or connector/cable nut (either a 1 1/16" Amphenol connector or 1 3/16" cable nut) to tighten the LDT within the bracket (see Figure 2-1). This may damage the LDT and will void your warranty. To tighten the LDT within the bracket, use the 1.75" hex mounting base on the head assembly.

If the length of the LDT’s rod end is less than 30”, skip to the sub-section: Mounting the Magnet Assembly.

Installing Support Brackets

It is recommended that a support bracket be used with LDTs having a rod 30”-71” in length. Supporting the end of the rod will minimize operational errors and protect against damage due to shock and vibration. If the length of the LDT’s rod is 72” or longer, it is recommended that additional support brackets be used. These additional support brackets must be made of a non-ferrous material. Because these additional support brackets will interfere with the magnet’s movement, a special split-type magnet assembly must be used. To order a split magnet (part number SD0411200) and support brackets (part number SD0411100), contact Factory.

To install a support bracket for a LDT having a rod 30”-71” in length, perform step 4a. If the rod is longer than 71”, perform step 4b.

4a. If the support bracket is made of a

ferromagnetic material (material readily magnetized), install the support bracket no closer than 0.25” from where the LDT’s dead band ends and the area of stroke begins. Continue to the sub-section: Mounting the Magnet Assembly.

To install two or more support brackets for a LDT having a rod 72" or longer in length, perform the following steps:

4b. Install support brackets at increments of 48”

throughout the LDT’s rod. Support brackets placed within the null zone and area of stroke or closer than 0.25” to the beginning of these areas must be made of a non-ferrous material.

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Mounting the Magnet Assembly

Before mounting the magnet assembly, the following should be considered:

• Ferromagnetic material should not be placed

closer than 0.25” from the LDT’s magnet assembly or rod end. Failure to do so could cause erratic operations. Non-ferrous materials, such as brass, copper, aluminum, non-magnetic stainless steel, or plastics, can be in direct contact with the magnet assembly and rod end without producing any adverse results.

• Minimal clearance between the LDT’s rod and

the magnet assembly through the full stroke is required. Stress between the magnet and the

rod can cause exing of the mounting brackets.

This may appear as nonlinearity.

• LDTs using a split magnet assembly must keep the diameter of the magnet assembly around the rod throughout the complete stroke. The diameter of this magnet assembly should not be farther than 0.2” away from the rod. Split magnet assemblies outside this range will cause signal loss.

To install the magnet assembly, perform the following steps:

1. Slide the magnet assembly over the LDT rod.

2. Mount the magnet to the non-ferrous, movable portion of the device being controlled using nonferrous screws.

2.2: Installing the LDT in a Hydraulic Cylinder

Before installing an LDT in a hydraulic cylinder, note the following considerations. Items discussed in this section are found in Figures 1-1 and 2-1.

• A non-ferrous spacer must be used to separate the magnet assembly from the head of the piston rod. See Figure 2-1.

• The magnet should not be closer than 2.0”

from the base of the LDT’s hex head when the piston rod is fully retracted. In instances where space restraints exist, it may be required to countersink the magnet into the piston rod. Two magnets are available for mounting to the piston: the standard 1.29" in diameter (part number SD0400800) four-hole magnet and a 1.0" magnet (part number SD0410300) designed exclusively for countersunk mounting applications. The 1.0" magnet must be held captive with a snap ring.

• An O-ring groove is provided at the base of the

LDT’s mounting hex for pressure sealing. The O-Ring seal was designed to meet Mil-StdMS33656. Refer to SAE J514 or SAE J1926/1 for machining of mating surfaces.

• It is recommended that a chamfered rod

bushing be used with LDTs having a rod 60.0” or longer in length. On applications with rods of this length, a chamfered rod bushing in front of the magnet may be required. This bushing will prevent wear on the magnet assembly (wear occurs as the piston retracts from extended lengths). This rod bushing should be manufactured from a high wear polymer, such

as Teon®.

• It is recommended the bore for the cylinder

piston rod have an inside diameter of at least

0.50”. The LDT rod has an outside diameter of

0.405”. Use standard practices for machining and mounting these components. Consult the cylinder manufacturer for details on applicable

SAE or military specications.

Before performing the following steps for installing the LDT into a hydraulic cylinder, it may be necessary to perform machining and mounting operations on the hydraulic cylinder. Consult the

information and specications provided by the

cylinder manufacturer before beginning the following steps:

1. Unscrew the LDT’s jam nut from the threads protruding from the hex mounting base.

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2. Position the non-ferrous spacer against the

piston face, followed by the magnet, and nally

the chamfered rod bushing. (If the length of the LDT’s rod is 60.0” or longer in length, it is recommended that a chamfered rod bushing be used.)

3. Insert non-ferrous screws through the chamfered rod bushing (if used), magnet, and non-ferrous spacer, and secure items by tightening screws.

If the leading edge of the magnet will come

closer than 2.0” from the base of the LDT’s hex head when the piston rod is fully retracted, it will be necessary to counterbore the magnet assembly into the piston rod. Both the standard

1.29” four-hole magnet assembly (part number SD0400800) and the 1.0” magnet assembly (part number SD0410300) are designed for counterbored mounting applications. If it has a 1.0” magnet assembly, a snap ring will be needed to hold it in place.

4. Insert the LDT’s rod into the hole of the hydraulic cylinder’s mounting bracket.

The protective Plug may need to be removed

from the hydraulic cylinder before inserting the LDT. The end cap should contain a 3/4 - 16 UNF

- 2B threaded hole. Screw the LDT into this hole using the threads protruding from the LDT’s hex mounting base.

At this point, the LDT should now be properly installed inside the hydraulic cylinder. It may now be necessary to assemble parts of the hydraulic cylinder. For assistance in this task, refer to the information provided by the cylinder manufacturer.

.28

2 PLACES

PROBE

NOTES: UNLESS OTHERWISE SPECIFIED

1. MOUNTING KITS FURNISHED WITH MOUNTING BOLTS.

2. MOUNTING BRACKETS ARE MADE FROM 3/16" X 2" X3" STAINLESS STEEL.

1.75 HEX

1.00

2.00

1.25

.37

.44

NULL

3/4-16 JAM NUT SUPPLIED W/PROBE

2.00

OPTIONAL

MAGNET

.62

1.25

STROKE DEAD

PROBE MOUNTING KIT

(P/N 949003)

1.00

MAGNET MOUNTING KIT (P/N 949005)

.28

2 PLACES

Figure 2-1: Mounting the LDT

.28 X 1.03 SLOT

BAND

2.00

1.00

1.03

.187 THRU

(2 PLACES)

NOTE: USE THIS MAGNET WITH ROD

SUPPORT BRACKET SD0411100

MAT’L.: STAINLESS STEEL.

1.407

N N

2.50 REF.

.38

.75 THRU

.406

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STANDARD 4-HOLE MAGNET

CABLE NUT

0.5" BORE MINIMUM

O-RING SEAL

MAGNET SPACER

OPTIONAL ROD BUSHING

Figure 2-2: Mounting LDT in a Hydraulic Cylinder

.094 MAX.

R.015

MAX.

.008 .004

RECOMMENDED MIN. SPOTFACE

DIAMETER

.004 A

.813

+/-.002

SEE NOTE 1

MINIMUM

SEE NOTE 2

125

.106

+/-.008

125

PITCH

DIA.

SEE NOTE 4

Figure 2-3: Port Detail (SAE J1926/1)

1.18

.866

.500

REF.

.008 A

1.100

SEE NOTE 4

SEE NOTE 3 SEE NOTE 4

3/4-16 UNF-2B THREAD

1.250

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Chapter 3: 952 Wiring Connections

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

• Power Supply Connections (including grounding and shielding)

• LDT Input/Output Connections

Power Supply/Ground Connections

The BlueOx standard cable is Alpha XTRA-GUARD 2 25110 SUPRASHIELD™, a multi-conductor cable with a specially formulated polyurethane jacketing, 10 conductors of 22 ga, with an aluminum/polyester/ aluminum foil with drain wire plus an overall braid of tinned copper shield. Cable O.D. is .30. Connector option S, used only on the analog version, use 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 GND. The cable shield is not connected at the transducer rod. Always observe proper grounding techniques such as single point grounding and isolating high voltage (i.e. 120/240 VAC) from low voltage (15 - 26 VDC cables for digital LDTs) and (13.5 - 30 VDC cables for analog LDTs).

WARNING: Do not use molded cordsets with LED's!

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 (pin B) should be connected to the power supply common (-) terminal. Pin C 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. For assistance, refer to your LDT’s wiring drawing in this chapter.

Bipolar Wiring

If using the bipolar option, ensure that the power supply is rated at ± 15 VDC at 100mA for each polarity. The power supply should provide less than 1% ripple with 10% regulation. The power supply

should be dedicated to the LDT to prevent noise and external loads from affecting the BlueOx performance. See Figure 3-1. For more wiring

information, see wiring diagram in this chapter. Be sure to identify the proper version of the LDT. A linear supply should always be used with any LDT.

NOTE: Do not use Bipolar Wiring for 952A or 952 QD. See Section 3.4 for 952A wiring details and Section 4.6: 952 QD Wiring Connections, for wiring details.

Unipolar Wiring

for Digital Style LDTs

Single ended power supply

+15 to +26 VDC

+ COM

Pin C (red) Pin B (black)

Pin J (purple)

Bipolar Wiring

for Digital Style LDTs

Single ended power supply

+15 to +26 VDC

+15 COM -15

Pin C (red)

Pin B (black)

Pin J (purple)

Figure 3-1: Power Supply Wiring (Unipolar/Bipolar)

WARNING: Do not route the BlueOx cable near high voltage sources.

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Unipolar Wiring for Analog

Style LDTs

(10 Pin Connector E)

Single ended power supply

+13.5 to +30 VDC

+ COM

Pin C (red) Pin B (black)

Unipolar Wiring

In order for the BlueOx to operate properly, the LDT’s external power supply must provide a voltage between +13.5 to +30 VDC for analog and +15 to +26 VDC for digital style LDTs. The power supply must be rated at 250mA minimum. The power supply should provide less than 1% ripple with 10% regulation.

The power supply should be dedicated to the LDT to prevent noise and external loads from affecting the BlueOx. When powering up more than one BlueOx on a single power supply, each

BlueOx will draw no more than 250mA.

3.1: 952 Analog - V0/V1 (Voltage)

The 952A-V LDT generates a voltage output based on position. The 952A BlueOx with analog output offers 16 bits of resolution and is fully programmable over the entire active stroke length of the LDT. Keep in mind that there is a 2” Null area at the connector end of the LDT and a 2.5” Dead area 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 units are 100% absolute and will not lose programmed parameters on power loss.

3.2: 952 Analog - C4/C2 (Current)

The 952A-C LDT generates a current output based on position. The 952A BlueOx with analog output offers 16 bits of resolution and is fully programmable over the entire active stroke length of the LDT. Keep in mind that there is a 2” Null area at the connector end of the LDT and a 2.5” Dead area 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 on power loss. The analog output is referenced to the analog common terminal and should not be referenced to any of the other common terminals. To wire the 952A current LDT, see Section 3.4 and Figure 3-2. For programming Zero and Span, refer to Section 3.9.

NOTE: 952A-C is current sourcing, which allows

the current to ow from the LDT into the user’s

equipment.

3.3: 952 Analog - D0/D1 (Differential Analog Output)

The 952A analog LDT’s are available with an optional differential analog output. This feature is

hardware specic and must be specied at time of

order. The differential feature allows the distance between two magnets to be measured. The magnets must remain within the active stroke range at all times and cannot be any closer than 2.5” to each other. Keep in mind that there is a 2” Null area at the connector end of the LDT and a 2.5” Dead area at the other end of the LDT that the magnets 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 units are 100% absolute and will not lose programmed parameters on power loss. For programming Zero and Span, refer to Section 3.9.

The analog output is referenced to the analog common terminal and should not be referenced to any of the other common terminals. To wire the 952A voltage LDT, see Section 3.4 and Figure 3-2. For

programming Zero and Span, refer to Section 3.9.

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3.4: 952 - Analog Wiring

Connector Option S & C Pin # Wire Color Function

1 Brown Customer Supplied Power (+VDC)

LDT Connector View

Connector Option E Pin # Wire Color Function

G K J

LDT Connector View

2 White Program Input

3 Blue Power Supply Common

4 Black Position Output

5 Gray Position Common

A White Frame (No Connection)

B Black Power Supply Common

C Red Customer Supplied Power (+VDC)

D Green No Connection

E Brown Position Output

F Blue Program Input

G Orange No Connection

H Yellow 2nd Position Common

J Purple 2nd Power Supply Common

K Gray Position Common

Insulate and tie back any unused wires

Connector Option T & Q Pin # Wire Color Wire Color Striped Function

1 White White/Blue Stripe Power Supply Common

2 Brown Blue/White Stripe No Connection

3 Gray White/Orange Stripe Position Common

4 Pink Orange/White Stripe Position Output

5 Red White/Green Stripe Customer Supplied Power (+VDC)

9 7 5

6 Blue Green/White Stripe No Connection

7 Black White/Brown Stripe No Connection (Position output on pins 3 & 4)

LDT Connector View

MTS® Connector

Option RB & RC

8 Purple Brown/White Stripe No Connection (Position output on pins 3 & 4)

9 Yellow White/Gray Stripe No Connection

10 Green Gray/White Stripe Program Input

GEMCO Style 952A LDTs are programmable for zero and span. Position output is on pin 4

Connector Option M Pin # Wire Color Function

A White Power Supply Common

G K J

C Gray Position Common

D Pink Position Output

E Red Customer Supplied Power (+VDC)

G Yellow No Connection (Position output on pins 3 & 4)

LDT Connector View

MTS® Connector

Option RB & RC

H Green No Connection (Position output on pins 3 & 4)

GEMCO style 952A LDTs are programmable for zero and span. Position output is on Pin D

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3.5: 952A (Analog)

Differential Input

Power + Supply _

Customer Supplied Power

Power Supply Common

Program Input

Single Ended Input

Power + Supply _

Customer Supplied Power

Power Supply Common

Program Input

NOTE: 952A-C is current sourcing, which allows the

current to ow from the LDT

into the user’s equipment.

Figure 3-2: Current Sourcing

3.6: 952 CP (Control Pulse)

The control pulse signal interface of the BlueOx digital output series is a differential RS-422 output. The maximum cable length for the differential digital LDTs is 1,500 feet. To initiate a start pulse, an external device is used. This start pulse should be

1.0 microsecond in duration. After the start pulse

952A

LDT

952A

LDT

Position Output

Position Common

Position Output

+ Input

- Input

+ Input

Common

is received, the LDT will generate a stop pulse of

1.0 microsecond in duration. The time between the leading edge of the start pulse to the leading edge of the stop pulse is the proportional distance between the magnet to the hex head. The order of these two pulses is illustrated in Figure 3-3. To wire the 952CP, see Figure 3-7. For proper grounding information, see the beginning of this chapter.

1 MICROSECOND (RECOMMENDED)

0.2 MICROSECONDS (MINIMUM)

+ INPUT (START PULSE)

TIME BETWEEN PULSES IS PROPORTIONAL TO DISTANCE BETWEEN MAGNET AND HEX HEAD

+ OUTPUT (STOP PULSE)

Figure 3-3: 952CP Control Pulse

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+ 25 hidden pages