Series Series952 956 INSTALLATION MANUAL LINEAR DISPLACEMENT TRANSDUCERS 952 BlueOx Linear Displacement Transducer ABSOLUTE PROCESS CONTROL KNOW WHERE YOU ARE...
Contents Chapter 1: Overview Chapter 1: Overview..................................................................2 1.1 Dimension Drawing for all 952 LDTs...................................3 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.
Figure 1-1: BlueOx Linear Displacement Transducer Drawing D0234200 1.1: Dimension Drawing for all 952 LDTs 1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • 248.435.0700 • Fax 248.435.8120 • www.AMETEKAPT.
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 flux 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.
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.
2. Position the non-ferrous spacer against the piston face, followed by the magnet, and finally 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.
STANDARD 4-HOLE MAGNET 0.5" BORE MINIMUM CABLE NUT O-RING SEAL MAGNET SPACER OPTIONAL ROD BUSHING Figure 2-2: Mounting LDT in a Hydraulic Cylinder 1.18 .004 RECOMMENDED MIN. SPOTFACE DIAMETER SEE NOTE 1 A .866 .813 +/-.002 MINIMUM SEE NOTE 2 .008 125 .094 MAX. .106 +/-.008 R.015 MAX. R A 1.100 SEE NOTE 4 45 .008 .004 1.250 SEE NOTE 3 SEE NOTE 4 125 15 3/4-16 UNF-2B THREAD A PITCH DIA. .500 REF. SEE NOTE 4 Figure 2-3: Port Detail (SAE J1926/1) 1080 N.
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.
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. 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.
3.
3.5: 952A (Analog) Differential Input Power Supply + _ Position Output Customer Supplied Power 952A LDT Power Supply Common Position Common + Input - Input Program Input Single Ended Input Power Supply + _ Position Output Customer Supplied Power Power Supply Common 952A LDT + Input Program Input NOTE: 952A-C is current sourcing, which allows the current to flow from the LDT into the user’s equipment. Common Figure 3-2: Current Sourcing 3.
3.7: 952 VP (Variable Pulse) The variable pulse signal interface of the BlueOx digital output series is a pulse width modulated signal (RS-422). The maximum cable length for the differential LDTs is 1,500 feet. This LDT can also be configured for external or internal interrogation. External interrogation is when an external device connected to the LDT generates a start pulse. This start pulse should be a minimum of 1.0 microsecond in duration.
3.8: 952 RS (Start/Stop) The start/stop signal interface of the BlueOx digital output series is differential RS-422 output. The maximum cable length for differential LDTs is 1,500 feet. To initiate a start pulse, an external device is used. This start pulse should be a minimum of 1.0 microsecond in duration. Within 50 nanoseconds after the leading edge of the start pulse, the LDT will generate a start pulse of 1.0 microsecond in duration. A stop pulse of 1.0 microsecond in duration will follow.
3.9: 952 CP, RS, VP Wiring PINOUT FOR STANDARD CIRCULAR CONNECTOR AT TRANSDUCER HEAD PIN-C RED PIN-B BLACK PIN-J PURPLE PIN-K GRAY PIN-A WHITE PIN-F BLUE PIN-E BROWN PIN-D GREEN PIN-G ORANGE PIN-H YELLOW +15 TO +26 VDC POWER SUPPLY POWER SUPPLY COMMON -15 VDC FOR BIPOLAR POWER SUPPLY* +INTERROGATION -INTERROGATION +GATE -GATE NO CONNECTION NO CONNECTION NO CONNECTION *For unipolar power supply, it is recommened to connect this wire to power supply common Drawing No. Rev.
3.10: Setting Zero & Span Position (Analog LDTs Only) 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.
Chapter 4: 952 QD Overview 4.1: Quadrature Output A new method of interfacing magnetostrictive transducers offers customers an interface as common as analog with the speed and accuracy of pulsed type signaling. The GEMCO 952 QD Linear Transducer provides quadrature output directly from the transducer to the controller (see drawing below).
It is important that the customer drive the signal levels much greater or lower than the threshold voltages. Asserting a signal with a voltage level close to the threshold voltage could induce multiple activations of that input (or none at all) and therefore produce unexpected results or probe readings. Outputs The quadrature probe has three outputs, the A, B and Z outputs. These outputs are differential (also known as balanced). That is, the connection for each output consists of two signal wires.
4.3: Quadrature Output Resolution and Speed The internal resolution of the 952 GEMCO Linear Transducer is 0.001”. This would be represented to the encoder input device by specifying an output resolution of 1,000 cycles per inch for the transducer. Although the typical resolution is 1,000 cycles per inch (CPI), the transducer can be ordered with virtually any CPI setting.
4.5: Features Burst Mode Enables the system to be absolute even though data transfer is through incremental method. In the event of power failure, the controller can be programmed to automatically send a signal to the probe then the probe will respond with the current position data. An input signal to the probe will cause a burst of data, representing the absolute position, to be fed back to the controller.
4.6: 952 QD Wiring Diagram Figure 4-2: 952QD Wiring Diagram Drawing E0237900 20 1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • 248.435.0700 • Fax 248.435.8120 • www.AMETEKAPT.
Figure 4-3: Input Signal Connections for 952 QD LDT Drawing E0237700 1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • 248.435.0700 • Fax 248.435.8120 • www.AMETEKAPT.
Rt is the termination resistor typically used for differential connections. If these termination resistors are not internal to the controller, they should be installed externally at the connector. If these are not specified or included with the controller, use 1K Ohm resistors. Figure 4-4: Output Signal Connections for 952 QD LDT Drawing E0237600 22 1080 N. Crooks Road • Clawson, MI 48017 • 800.635.0289 • 248.435.0700 • Fax 248.435.8120 • www.AMETEKAPT.
4.7: 952 QD Frequency Frequency or Pulse Rate Selecting the proper frequency in the part number and your controller is very important. The internal clocks inside of the 952QD interrogates the LDT and transmits the incremental pulses at a fixed rate of speed. The frequency or pulse rate of the 952QD is factory set to 10KHZ - 1.00MHZ, consult part numbers for your model. The input to the PLC or display will determine the frequency needed.
Appendix A: Troubleshooting A.1: Troubleshooting for 952 QD 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 factory. Troubleshooting is divided into the following two groups: • General Checks • Power Supply General Checks Make sure that the magnet is located within the LDT’s active stroke area.
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 a short/ open in the cable. If reading is not between +11 and +28 VDC, go to step 5. If reading is above +28 VDC, adjust power supply or replace. 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.
A.2: Troubleshooting for 952 Analog LDTs Troubleshooting describes common problems that can occur when installing the LDT and offers possible solutions to these problems. If, after reading this appendix, a problem is still unresolved, please contact our technical support department. Troubleshooting is divided into the following two groups: • General Checks • Power Supply General Checks Make sure that the magnet is located within the LDT’s active stroke area.
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. A.3: Troubleshooting for 952 CP, RS or VP LDTs Troubleshooting describes common problems that may occur when installing the LDT and offers possible solutions to these problems.
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 +15 and +26 VDC.
Appendix B: Ordering Information B.1: Analog Part Numbering 952A V0 0120 X X E Analog BlueOx Output Type V0 = 0 - 10 VDC V1 = 10 - 0 VDC C4 = 4 - 20mA C2 = 20 - 4mA D0 = Differential 0 - 10 VDC* D1 = Differential 4 - 20mA * *Analog differential output is the difference between two magnets. Minimum distance is 2.5”. Stroke in Inches Insert stroke in inches to 0.1 inch. Enter as a four-place number. Example: 12.0 in stroke entered as 0120.
B.2: Digital Part Numbering 952VP 0120 X X E I 001 CP = Control Pulse VP = Variable Pulse RS=RS422Start/StopPulse Stroke in Inches Insert stroke in inches to 0.1 inch. Enter as a four-place number. Example: 12.0 in stroke entered as 0120. To convert a metric stroke in millimeters, multiply millimeter value by 0.03937 to arrive at inch value. Null Zone X = Standard 2 inch Null N _= Insert non-standard Null over 2 inches Dead Zone X = Standard Dead Zone of 2.
B.3: Quadrature Part Numbering 952QD 0120 X X E 1000 E F7 M1 N D X BlueOx with Quadrature Output Stroke in Inches Insert stroke in inches to 0.1 inch. Enter as a four-place number. Example: 12.0 in stroke entered as 0120. To convert a metric stroke in millimeters, multiply millimeter value by 0.03937 to arrive at inch value. Null Zone X = Standard 2 inch Null N _= Insert non-standard Null over 2 inches. Dead Zone X = Standard Dead Zone of 2.5 inches D _= Insert non-standard Dead Zone over 2.
Appendix C: Specifications General Specifications Rod End 316 Stainless Steel, 0.405" (10.29 mm) outer diameter Mounting Hex 316 Stainless Steel, 1.75" (44.45 mm) across flats Mounting Threads 3/4-16 UNF-2B x 1.00" (25.4 mm) with ESNA Jam Nut and O-ring seal Head Assembly Thick Wall Aluminum Cover with Viton O-ring Standard Gasket Seal at the Base and Connector Exit, NEMA 4 (Type 6 optional, consult factory). Connector 1/4 turn MS-Style Standard (quick connect/disconnect) Connector.
Analog Specifications Analog Output Drift 10ppm/Degree F (18ppm/DegreeC) Analog Output Loading Voltage Output Minimum Load Resistance: 2Kohm Current Output Maximum Load Resistance: (Vin - 2)/0.
Glossary Active Stroke Area The area designated by the operator on the rod on which the magnet assembly moves. Burst Input Bipolar Power Supply An input signal to the probe will cause a burst of data, representing the absolute position to be fed to the controller. NOTE: This only applies to the quadrature LDT. A power supply that provides both +15 and -15 VDC.
Rod The method used to improve the resolution of a system using a digital LDT. The On time of a pulse width output is multiplied by a specified factor (from 1-127). This multiplication provides more counting time for the counter in the customer’s electronics, thus improving the resolution. The only disadvantage to higher recirculation numbers is the time needed to process the signals. A pulse generated by the BlueOx to determine the location of the magnet assembly on the rod end.
Other Products Copyright 2005 by AMETEK AUTOMATION & PROCESS TECHNOLOGIES. All Rights Reserved. Made in the USA. 1080 N. Crooks Road, Clawson, MI 48017-1097 Phone: 248.435.0700 Toll Free: 800.635.0289 Fax: 248.435.8120 www.AMETEKAPT.com 952.M3R 6/10.
