Lorenz DR-1986, Operation Manual

Page: 11 / 12

LORENZ MESSTECHNIK GmbH Obere Schloßstr.131
73553 Alfdorf  07172 / 93730-0
Fax 07172 /93730-22
E-Mail: info@lorenz-sensors.com Technical changes reserved 090327.docx
Internet: www.lorenz-sensors.com Page 11 of 12
7.2 Trouble Shooting
This chart should help to search for the most frequent errors and their elimination
Problem Possible Cause Trouble Shooting
No signal No sensor excitation

Outside of permissible range

Connect excitation

Cable defect

No mains supply
Signal output connected wrong

Connect output correctly

Evaluation electronics defect
Sensor does not react to torque Shaft not clamped 
Clamp correctly
No power supply 
Outside of permissible range

Connect supply

Cable defect

No mains supply
Cable defect

Repair cable
Connector connected wrong

Connect correctly
Signal has dropouts Axial position rotor to stator
outside of tolerance

Align rotor
Cable defect 
Repair cable
Zero point outside of tolerance Cable defect 
Repair cable
Shaft mounted distorted 
Mount correctly
Distorted shaft string 
Release from distortion
Strong lateral forces 
Reduce lateral forces
Distorted flanges 
Check evenness of flange-
surfaces
Shaft overloaded 
Send to manufacturer
Wrong torque indication Calibration not correct 
Re-calibrate
Sensor defect 
Repair by manufacturer
Torque shunt 
Eliminate shunt
Oscillations Alignment of shaft not correct

Align correctly
Unbalance 
Balance the corresponding
parts
8 Decommission
All sensors must be dismantled professionally. Do not strike sensor housings with tools. Do not apply
bending moments on the sensor, e.g. through levers. The torque sensor must be supported to avoid
falling down during the dismantling.
9 Transportation and Storage
The transportation of the sensors must occur in suitable packing.
For smaller sensors, stable cartons which are well padded are sufficient (e.g., air cushion film, epoxy
crisps, paper shavings). The sensor should be tidily packed into film so that no packing material can
reach into the sensor (ball bearings).
Larger sensors should be packed in cases.
9.1 Transportation
Only release well packed sensors for transportation. The sensor should not be able to move back and
forth in the packing. The sensors must be protected from moisture.
Only use suitable means of transportation.
9.2 Storage
The storage of the sensors must occur in dry, dust-free rooms, only.
Slightly lubricate shafts and flanges with oil before storing (rust).