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Fault Finding and Diagnostics

 
TTS transducers are designed and manufactured to provide extended trouble free service.  If, however, the unit appears to function incorrectly, the following checks may point to the cause.
If you are experiencing problems then the following points should be considered.
Is the fault with the load cell, the amplifier or is it the installation.  It could be a combination of these but if you have used TTS products it is a straightforward process to make a diagnosis.
 
Firstly, consider the installation components as separate elements.
Do not attempt to diagnose problems in closed loop as the loop is self compensating.
 
SYMPTOM
POSSIBLE CAUSE
REMEDY
 
Transducer output signal appears excessive with little or no load.
 
A     The transducers and/or the fixed shaft assembly are incorrectly aligned causing an extraneous load on the transducers.
 
 
Re-align.
 
 
 
B     The transducer has been selected with a nominal rating too low for the application.
 
Select and fit a transducer with higher nominal value.
 
 
 
C     An error has been made during the calibration process.
 
Re-calibrate the transducer.
 
Transducer output signal appears to be low.
 
A     A transducer has been fitted which has a nominal rating too high for the application.
 
Fit a replacement transducer of the correct rating.
 
 
 
B     The mechanical configuration of the machine or transducer position has changed.
 
Re-orientate transducers and re-calibrate.
 
 
 
C     The web tension has changed significantly.
 
Consult local production personnel.
 
 
 
D     An error has been made during the calibration process.
 
Re-calibrate the transducers.
 
Transducer output is not responsive to increases in loading.
 
A     A transducer has been fitted which has a nominal rating too low for the application.  This is causing the transducer to overload.
 
Reduce either the web wrap angle or the weight of the fixed shaft and roller assembly, or replace  the transducer.
 
 
 
B     The mechanical configuration of the machine or the position of the transducer has changed.
 
Re-orientate transducer and re-calibrate.
 
 
 
C     An error has been made during the calibration routine.
 
Re - calibrate the transducer.
 
The web tension measurement  is unstable.
 
A     Transducer cable is damaged.
 
Replace the cable.
 
 
 
B     Bad connection on transducer cable.
 
Repair the connection.
 
 
 
C     Environmental conditions creating pickup or spiking on transducer cables.
 
Check EMI levels using an oscilloscope.
 
 
 
D     The measurement roller is jamming or seizing.
 
Replace or repair the measurement roller and/or bearings.
 
 
 
E     Transducer body or mountings are not correctly secured.
 
Re-secure, ensuring transducers are correctly orientated.
 
 
 
F     Remote equipment (signal amplifier) faulty.
 
Contact the remote equipment supplier.
 
No output from transducer.
 
A     Damaged transducer cable.
 
Replace the cable.
 
 
 
B     Broken or bad solder joint on cable mounted socket.
 
Re-solder connection with remote equipment disconnected.
 
When the traducers are connected to the amplifier the unit does not calibrate.
 
Check the polarity of the supply voltage.
 
Reverse the polarity of the supply voltage if the supply is wrong.