LXT 980 and LXT 981 TORQUE SENSOR USER’S GUIDE www.cooperinstruments.
CONTENTS 1.0 INTRODUCTION .....................................................................................................................................................................................3 2.0 MODEL LXT 980 / LXT 981 ...................................................................................................................................................................3 3.0 TECHNICAL CHARACTERISTICS OF THE SENSOR ..................................................................
1.0 INTRODUCTION With this torque sensor the effective torque on the gauge bar can be measured bi-directionally independent from rotational speed. The sensor is delivered as a complete unit with corresponding connecting cable and key stones. The transmitting shaft, the contact-free signal pick-up and the analog signal processing are integrated into the sensor structure. No external amplifier is needed.
3.0 TECHNICAL CHARACTERISTICS OF THE SENSOR No. LXT 980 0.1 Accuracy class1) Unit Linearity deviation incl.
EMI / EMC Unit Value Tested Standards 23 EN 61000-6-3: 2007 PASSED 24 EN 55011: 2009 + A1: 2010 class B PASSED 25 EN 61000-6-2: 2005 PASSED 26 EN 61000-4-2 (ESD) : 2009 PASSED 27 EN 61000-4-3 (HF) : 2006 + A1: 2008 + A2: 2010 PASSED 28 EN 61000-4-4 (BURST): 2004 + A1: 2010 PASSED 29 EN 61000-4-5 (Surge): 2006 PASSED 30 EN 61000-4-6: 2009 PASSED 31 EN 61000-4-8: 2010 PASSED 32 EN 61000-4-11: 2004 PASSED Load limits4) Unit Value 33 Maximum measurable torque % 110 34 Maximum torque, related to nominal torque %
5.0 AVAILABLE OPTIONS 5.1 Optional Signal Outputs In addition to the analog output signal the LXT 980 and LXT 981 can also be delivered with another option output signal as listed below.
Cycles (optical) 1 Cycle error 2 Pulse width error 3 State width error 4 Phase error 5 Index pulse width 6 Ch I rises after Ch B or Ch A falls 7 Ch I rises after Ch A or Ch B rises 8 Rise-time 9 10 Fall-time 7) Degree is with respect to the rotation. Symbol n ΔC ΔP Δsx Δφ P0 t1 t2 tr tf Unit Degree7) Degree7) Degree7) Degree7) Degree7) ns ns ns ns Regular 360 0.8x10-2 1.9x10-2 1.4x10-2 0.6x10-2 0.25 100 300 180 50 Min. Max. 0.17 10 10 4.2x10-2 8.3x10-2 8.3x10-2 4.2x10-2 0.33 1000 1000 6.
250 Nm 500 Nm 1000 Nm 2000 Nm 220 220 350 350 93 93 130 130 63,5 63,5 110 110 25g6 25g6 40g6 40g6 106 106 126 126 70 70 90 90 61 61 80 80 40 40 60 60 67 67 87 87 Ball bearing Shaft ending Distance K [mm] Ø 15 mm Ø 25 mm Ø 40 mm 82.0 83.4 114.6 Description Outer diameter [mm] Inner diameter [mm] Max. rotation of bearing [rpm] E2.
7.0 CONNECTION PLAN Pin assignment at Sensor.
8.3 Installation and Removal Make sure to install the sensor shafts exactly with the proper aligned connecting shafts. The key stone adapter / square endings of the connecting shafts are to be attached forceless to the corresponding ones of the sensor. The sensor is not designed as a step bearing. No external axial or radial force should be on the housing of the sensor by fixing it. In case that the bending or radial forces could not avoided the ball bearing of the sensor must be double-checked.
Tare function and error indication: The LXT 980/981 contains a LED button on the housing surface. Pressing the button will set the signal output to 5V. The illumination of the button serves as a function / malfunction indicator. Functional indicator: LED off: Missing power supply or sensor is damaged. LED on: Sensor is ready. Error indicator: LED flashes: The sensor is not ready. Flashing of LED can have several possible causes. Various causes are interpreted through a flash code.
which is listed in the calibration certificate as well as on the label of the sensor. The calibration certificate also shows the accuracy of each sensor. The accuracy class of a Cooper Instruments torque sensor means that the largest single deviation of all values represented in percentage is either smaller than or equal to the value listed in the accuracy class. Calibration value: The calibration characteristic value shows how much the output signal changes per torque.
10.
