6
OPERATION
114
IFC 300
www.krohne.com
06/2009 - 4000069802 - MA IFC 300 R03 en
Application error
F RAM/ROM error IO1
A RAM or ROM error is detected during the
CRC check.
Defect, replace electronic unit or
input/output module (I/O module).
F RAM/ROM error IO2
F Fieldbus
Malfunction of the Fieldbus, Profibus or FF
interface.
Modbus or Ethernet interface malfunction
(can also appear with some Profibus or FF
errors).
Messages on the display Description
Actions
Status: F _ _ _ _ _
Application fault, device OK, but
measured values affected.
Application test or operator action
necessary.
F application error
Application-dependent fault, but device is
OK.
Group message, when errors as described
below or other application errors occur.
F empty pipe
1 or 2 measuring electrodes are not in
contact with the medium: measured value is
set to zero. No measurement possible.
Measuring pipe not filled, function
dependent on Fct. C1.3.2. Check
installation. Or electrodes completely
insulated e.g. by oil film. Clean!
The two empty pipe messages cannot appear at the same time. The difference lies in
whether the measured value is also set to zero upon the detection of an empty pipe. The
sensor electronics will use one or the other function (setting to zero or further
measurement) depending on a selection made by the user.
F flow exceeding limit
Measuring range exceeded, filter setting
limits measured values. No message if
empty pipe.
Limitation Fct. C1.2.1, increase values.
If this limit occurs sporadically in processes with air pockets, solid contents or low
conductivity, then either the limit has to be increased or a pulse filter used so as to quell
the error messages and also reduce the measurement errors.
F field frequency too high
Field frequency is not reaching steady state,
a measured flow value is still being supplied
but may have errors. Measured values are
still supplied, but they are always too low.
No message if coil broken or bridged.
If Fct. C1.1.14 settling time is set to
"manual", increase value in Fct. C1.1.15. If
"standard" is set, set field frequency in
Fct. C1.1.13 acc. to signal converter
nameplate.
F DC offset
ADC over-ranged by DC offsets. No
measurement can be performed, the flow is
set to zero. No message if empty pipe.
For remote signal converters, check the
connection of the signal cable.
F open circuit A
Load on current output A/B/C too high,
effective current too low.
Current not correct, mA output cable has
open circuit or load too high. Check cable,
reduce load (set < 1000 ohm).
F open circuit B
F open circuit C
F over range A
The current or the corresponding measured
value is limited by a filter setting.
Check with Fct. C2.1 hardware or sticker in
terminal compartment, which output is
connected to the terminal.
If current output: extend Fct. C2.x.6 range
and Fct. C2.x.8 limitation.
If frequency output: extend values in
Fct. C2.x.5 and Fct. C2.x.7.
F over range B
F over range C
F over range A
The pulse rate or the corresponding
measured value is limited by a filter setting.
Or the demanded pulse rate is too high.
F over range B
F over range C
Messages on the display Description
Actions
Status: F _ _ _ _ _
Operational fault in device, mA output
≤
3.6 mA or set fault current (depending
on the seriousness of the fault), status
output open, pulse / frequency output:
no pulses
Repair necessary.
.book Page 114 Wednesday, June 10, 2009 4:20 PM
