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3.3 TROUBLESHOOTING
Fault: The weighing unit does not come on when the power is switched on
Cause: the indicator’s operating temperature range is -20 to +50°C
- Check that the temperature is not outside the operating limits.
No audible signal is heard
Cause: the indicator’s operating voltage is 12 Volts (maximum 17 Volts). It is protected by a 15A
fuse.
- Check that the +/- polarity is correct.
- Check the power supply voltage: this should be within the range 11 to 17 Volts d.c.
Warning: the indicator does not accept a.c.
- Check the connection to the tractor.
- Check the power supply cable fuse (15 A).
- For machines equipped with an internal battery, check the 2 A fuse.
- If the fuse is faulty, replace it: fuse type 5x20 2A.
The audible signal is heard
- Check the power supply voltage, this should be within the range 11 to 17 Volts d.c.
- For machines equipped with an internal battery, recharge the battery (see the section “Option:
internal battery life”).
- If the voltage is correct, adjust the display contrast as this may vary with temperature:
- for units made before April 1998, see adjustment on the board connection diagram, page 24
- for units made later than April 1998, adjust the contrast button on the front of the unit.
If these checks fail to reveal any reason for the fault, replace the weighing unit (see the section on
“Fitting and removing the sensors and the unit”).
Fault: The screen displays a ‘battery low’ message
This message is displayed in two situations:
1. The tractor power supply voltage has dropped below 11 V
For machines equipped with an internal battery, recharge the battery (see the section “Option:
internal battery life”).
2. There is a problem on the printed circuit board or a sensor (board and sensor monitoring)
In either case, run self-tests on the unit and sensors: see 3.2.3.1 “Testing the printed circuit voltages”
and “Displaying the sensor voltages”.
Fault: The weight is not correct
Cause: If the indicator displays 0 when the machine is loaded, the machine has been declared as
empty when it is full: refer to 3.2.2.3 (Confirmation of the tare).
- Check that the machine meets the specified operating conditions (see the section on “Operating
conditions”).
- Check the connections between the sensors and the printed circuit board and the condition of the
wiring.
- Run the self-tests on the unit and sensors: see 3.2.3.1 “Testing the printed circuit voltages” and
“Displaying the sensor voltages”.
- If the circuit board and sensors are all working properly and the operating conditions are correct,
carry out calibration as described in 3.2.2.2.
Summary of Contents for IND 360P
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