Dieci Pegasus - Angle and Extension Transducer Alarm

C/83
- CAUTION: - Read the SAFETY REGULATIONS (in this manual) carefully for the safety of all personnel and the machine.
Alarm
Level 1
No positive signal connection
Cursor not connected
Screen with cursor short circuit
Transducer fault
Alarm
Level 2
No transducer earth connection
Transducer fault
Alarm
Level 3
Calibration not carried out
Transducer mechanically shifted, therefore out of calibration
Transducer fault
Alarm
Level 4
Calibration not carried out
Transducer mechanically shifted, therefore out of calibration
Transducer fault
LIMITING DEVICE TRANSDUCER CONGRUENCE ALARM
For reasons of safety, extensions and angles are read by two different transducers and the values are then compared.
An alarm is triggered if the difference between the values of the two transducers is more than:
• 0.3 metres in case of extension
• 4 degrees in case of angles
The alarm is triggered when the two signals are different for at least 1 second.
Causes:
• Transducer or connection malfunction,
• Transducers not aligned
What to do:
• If there are any malfunctions, carry out the same controls as for the transducers.
• If necessary, calibrate the transducers.
ANGLE AND EXTENSION TRANSDUCER ALARM
The typically potentiometric extension or angle transducers provide a useful signal in their function range between 0.25 and 4.75 V.
The program converts the incoming voltage and makes the size measured typically in:
• Centimetres for distances
• Tenths of degree for angles
• Kg * 10 for weights
There are four alarm levels:
1. Reading of the unconverted signal less than 0.15 v
2. Reading of the unconverted signal more than 4.75 v
3. Value of the converted signal less than the minimum
4. Value of the converted signal more than the maximum
In particular, alarms 1 and 2 highlight any calibration errors rst.
Supposing a machine has a 5-m minimum extension and 15-m maximum extension; alarm 3 is triggered if the measured exten-
sion is less than 4.7 m, whereas alarm 4 is triggered if the extension is more than 15.3 m. The tolerances for these alarms are
0.3 m for extensions and 4 degrees for angles.
There is a delay of about 1 second before each alarm is triggered.