B&B Electronics ISOCON-3 - Manual - Manual (Page 15)

ISOCON-3 USERS GUIDE
7. TROUBLESHOOTING
The ISOCON has some built in self diagnostic functions. If the LED on the front
panel is flashing then the fault mode can be found by counting the number of
flashes between gaps and using the table below to locate the problem.
NOTE: Even if the LED is not lit, mains voltages could still be present –
ALWAYS isolate the mains supply before removing or examining the unit.
No of
Flashes
Nature of Fault Corrective Action
0 (Green
On)
Unit Working – no suspected
fault Check Wiring and switch
settings
2,3,4,5,6,8,9,
10,11,12
Green
Hardware Error, extreme
noise, poor supply Switch off unit, check switch
settings, and wiring, and retry.
If still faulty please contact
supplier
7 Green RTD / Thermocouple
burnout Repair RTD, T/C or wiring
3 or 4 Red Span point is too close to
zero point
Change input span value and
retry
3 or 4
Yellow
Zero point is too close to
span point Change input zero value and
retry
No LED Power Failure Check supply lines and voltage
7.1 Incorrect Reading
• Check that Unit is configured for the correct Sensor
• Check that Input Scaling is as required.
• Check that Linearisation has not been set incorrectly.
• Check that Thermocouples have correct compensation cables, and polarity.
• Check that RTD is set for correct option 2, 3 or 4 Wire.
• Check that RTD leads are connected to appropriate terminal pins.
7.2 Sensor Failure
• Check that sensor wiring is correct.
• Check Thermocouple polarity.
• Check that all RTD leads are connected to correct terminals.
• Check that the ISOCON is configured for correct sensor.
• Check that applied voltage is not out of range.
• Check that applied current is not out of range.
• Check that applied millivoltage is not out of range.
IIG060901 Page
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