KROHNE IFC 300 Converter EN - Manual (Page 138)

6
OPERATION
138
IFC 300
www.krohne.com 08/2010 - 4000069803 - MA IFC 300 R04 en
S electrode noise Noise on the electrodes too high. Measured
values are still supplied. No message if
empty pipe.
a) Electrodes extremely soiled;
b) Conductivity too low: activate noise or
pulse filter Fct. C1.2.4, C1.2.7;
c) Gas bubbles, solids or chem. reactions in
medium: activate noise or pulse filter
Fct. C1.2.4, C1.2.7;
d) Electrode corrosion (if message also
appears when flow is zero): use sensor with
suitable electrode material.
S gain error Preamplifier not equal to the calibrated
value; check calibration. Measured values
are still supplied.
Defective, replace electronic unit.
S electrode symmetry Impedance of the two measuring electrodes
not equal. Measured values are still
supplied.
Deposits in measuring tube or electrode
short-circuit to ground. Clean and check
measuring tube!
S field coil broken Field coil resistance too high. Check field coil connections to the
electronic module (for remote versions:
field current cable) for open circuit / short
circuit
S field coil bridged Field coil resistance too low.
S field current deviation Measured field current not equal to the
calibrated value. Check calibration.
Measured values are still supplied. No
message if coil broken or bridged.
Check field current connections. If OK:
defective, replace electronic unit.
S field frequency too high The ratio of the two measuring windows is
not equal to 1, the magnetic field is not
properly in steady state. Measured values
are still supplied.
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 measuring sensor
nameplate.
S electronic temperature Upper limit for the permissible electronic
temperature has been exceeded.
Ambient temperature too high, direct solar
radiation or, for C version, process
temperature too high.
S coil temperature Upper limit for the permissible coil
temperature has been exceeded. No
message if coil broken/bridged.
Process and ambient temperature too high.
S overflow counter 1 This is counter 1 or FB2 (with Profibus).
Counter has overrun and started again at
zero.
-
S overflow counter 2 This is counter 2 or FB3 (with Profibus).
Counter has overrun and started again at
zero.
-
S overflow counter 3 This is counter 3 or FB4 (with Profibus). Not
available without IO2. Counter has overrun
and started again at zero.
-
S backplane invalid The data record on the backplane is invalid.
The CRC check has revealed a fault.
No data can be loaded from the backplane
when replacing electronics. Save the data to
the backplane again (Service).
S error current A Error current at current input -
S error current B
S less 10% level The level sensor reports a low level inside
the pipe.
-
Messages on the display Description Actions
Status: S _ _ _ _ _ Out of specification, measurement
continues, accuracy possibly less. Maintenance required.