Burkert Type 8709 - Handbuch (Seite 14)

52
Problem Possible cause Remedial action
No flow-rate
available The set-point value
is below the limit
for the zero point
shut-off. Increase set-point
value to > 10%
of the nominal
flow-rate.
The device is
in an operating
state other than
standard controlled
operation. Check operating
state, see also
Chapter
9.3. .
The pipelines have
been sized too
large or may not yet
have been com-
pletely deaerated. Deaerate lines.
Change pipe size.
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Problem Possible cause Remedial action
Actual value
fluctuates FE connection not
correct. Connect FE to the
earthing point
(as short as pos-
sible, wire at least
2.5 mm²).
The controller is
continuously cor-
recting malfunc-
tions in an unstable
pressure supply, e.g.
by pumping. Connect suitable
pressure controller
upstream.
Install buffer tank
to absorb pressure
fluctuations.
The residual ripple
of the power supply
voltage is too high. Use power supply
with a smooth
output voltage at the
required power.
Set-point
value = 0%,
flow-rate still
available The operating
pressure is above
the maximum oper-
ating pressure of the
valve. Reduce the oper-
ating pressure.
Return device to
the manufacturer
to have the fault
repaired.
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54
Problem Possible cause Remedial action
Set-point
value = 0%,
valve is
closed,
no flow-rate
available;
however,
actual value
output indi-
cates a low
flow-rate The installation
position of the
device is incorrect. Install LFC in the
calibrated instal-
lation position and
run an Autotune
function to adjust
to the operating
conditions.
A fluid is used other
than that designated
by the calibration. Return device to
the manufacturer for
recalibration for the
operating fluid.
Set-point
value is not
reached The filter is blocked. Clean or replace
filter.
The primary
pressure is too low. Increase primary
pressure to cali-
bration pressure.
The back pressure is
too high. Check system com-
ponents for soiling
on output side and if
required clean.
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accessories / sPare 11.
ParTs
11.1. mass flow communicator
(Pc software)
The “Mass Flow Communicator” PC program is
designed for communication with the devices from the
Mass Flow Controller and Liquid Flow Controller families
supplied by Bürkert.
It is used to configure, as well as display and write various
parameters.
The program runs on the Windows platform and
requires a serial interface (RS 232) for commun-
cation with the LFC / LFM.
This program can be used to configure different settings on
the devices:
Read out information specific to the device •
Change the assignment of binary inputs and outputs •
Change the LED function assignment •
Activate various functions •
Change the dynamic properties •
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Type 8708, 8709, 8718, 8719