Burkert Type 8709 - Handbuch (Seite 13)

48
malfunctions 10.3.
Problem Possible cause Remedial action
Power LED
is not lit No power supply. Check the electrical
connections.
Power LED
flashes The Autotune
function is active. See chapter 9.3.
Power LED
goes out
periodically The power supply
collapses periodi-
cally – The device
implements a reset. Select power supply
with adequate
power.
The losses in the
connection cable are
too high. Increase cable
cross-section.
Reduce line length.
english 49
Problem Possible cause Remedial action
Limit (y) LED
is lit LFC: the actuating
variable of the
valve has (almost)
reached 100%.
The set-point value
cannot be corrected. Increase operating
pressure
(observe maximum
permitted supply
pressure).
Check line resis-
tance and if required
reduce.
Check equipment
design.
Check the filter
installed in the line
and if required
clean.
LFM: the actual
flow-rate value has
(almost) reached
or exceeded the
nominal flow-rate. Reduce flow-rate.
english
50
Problem Possible cause Remedial action
Limit (y) LED
flashes The device is in
an operating state
other than standard
controlled operation
or the Autotune
function. See chapter 9.3.
Error LED
is lit This is not a serious
fault, e.g. the last
Autotune function
was not concluded
successfully. Repeat Autotune
function or remove
the fault by per-
forming a reset.
english 51
Problem Possible cause Remedial action
Error LED
flashes The residual ripple
of the power 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.
broken sensor or
fault in the internal
power supply. Return device to
the manufacturer
to have the fault
repaired.
The sensor was
operated above the
permitted maximum
operating pressure. Reduce operating
pressure.
Return device to
the manufacturer
to have the fault
repaired.
english
Type 8708, 8709, 8718, 8719