Cooper Instruments & Systems LXT 981 Torque Sensor - Manual (Page 10)

CF 189 10 Rev. E; Dec. 12, 2011
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. The allowed bearing forces are listed in (Chapter 6.
Dimensions). The M4-screw threads on the side are only for fixing the sensor housing and keeping it from
distortion. A maximum cable length of 3m must not be exceeded. Using a cable or connector other than
supplied by NCTE, or a similar cable that is of a different length may affect the overall performance of the
sensor.
DO NOT REMOVE THE SHAFT WITH TORQUE APPLIED TO THE SENSOR.
8.4 Offset Adjustment
If required the zero point output signal (5V) can be adjusted by pressing the Tare-button. By factory
default the sensor is set to 5V at Null torque.
8.5 Interface Description
Mechanical connection:
The key stone adapters on both ends of the measurement shaft are intended for torque transmission.
Electrical connector:
On the sensor housing there is a 12-pin socket for the power supply and the signal output.(see Chapter 7.
Connection Plan).
8.6 Operation (in regular case or in optimal case)
Optimal measurement parameters may be achieved when the sensor is applied in accordance to the
specification. Use the sensor only for short periods of time at the maximum rotational speed. By
compliance with the specification the sensor works generally trouble-free and maintenance-free.
8.7 Irregular Operation, Measures against Disturbance
The presence of external electromagnetic or magnetic fields can lead to irregular measurement results.
The mechanical overload on the sensor (e.g. exceeding of maximum allowed torque or severe vibrations)
may cause damage to the sensor and in consequence the incorrect signal output. In such cases the
sensor must be reset (see Point 8.4 Offset Adjustment). If this does not help, do not open the sensor but
contact Cooper Instruments directly for assistance.
8.8 Commissioning
After sensor installation pay attention to the followings:
• Switch on the power supply unit and check the supply voltage. Peak voltage to the sensor must
be avoided! Be sure to verify the power supply voltage before connecting the sensor!
• Connect the sensor to the power supply unit by using the delivered cable.
• Connect the sensor output to a high-resistance device such as an A/D converter, oscilloscope,
PC measurement board. The sensor should be in mechanical unloaded state while connecting it.