42
Maintenance, Troubleshooting
Type 8700, 8701, 8703, 8705
42
Problem Possible cause Recommended action
The limit (y) LED is
flashing
Power / Autotune
Limit (y)
Error
The device is in an operating state other than standard
control mode or the Autotune function.
See chap. 8.3.
The Error LED is on
Power / Autotune
Limit (y)
Error
Minor fault, for example the last Autotune function has
failed.
Repeat Autotune
function or reset the device to acknowledge the fault.
The Error LED flashes
Power / Autotune
Limit (y)
Error
The residual ripple of the supply voltage is too high. Use a power supply with a smooth output voltage at
the required power.
A serious fault has occurred, e.g.: defective sensor or
fault in the internal power supply.
Return the device to the manufacturer to have the fault
repaired.
The sensor was operated above the permitted maximum
operating pressure.
Reduce the operating pressure.
Return the device to the manufacturer to have the fault
repaired.
No flow-rate available The set-point value is below the limit for the zero point
shut-off.
Increase the set-point value to > 2% of the nominal
flow-rate.
The device is in an operating state other than standard
control mode.
Check the operating state; see also chap. 8.3.
The lines have been sized too large or may not yet have
been completely deaerated.
Deaerate the lines.
Change the line diameter.
English
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