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Troubleshooting
!
MODBUS
Register:
Register:
6859
6821
Data type:
Data type:
Integer
String (18 byte)
Response to a fault message:
The value "NaN" (not a number) is
transmitted to the MODBUS master
instead of the current measured
value.
1
SYSTEM OK
No. # 7xx → Other process errors
111
EMPTY PIPE
112
EXC. CURR. LIM
113
FLUID INHOM.
114
NOISE LIM. CH0
115
NOISE LIM. CH1
116
FLOW LIMIT
124
ADJ. ZERO FAIL.
74
10.3
Process error messages
Note!
• The listed error message types below correspond to the factory setting.
• See also the information on → ä 29.
No.
Device status message
(local display)
Depicted on the local display:
S = System error
$ = Fault message (with an effect on the outputs)
! = Notice message (without any effect on the outputs)
–
There is no error present in the device
700
P: EMPTY PIPE
!: # 700
701
P: EXC. CURR. LIM
!: # 701
702
P: FLUID INHOM.
!: # 702
703
P: NOISE LIM. CH0
!: # 703
704
P: NOISE LIM. CH1
!: # 704
705
P: FLOW LIMIT
$: # 705
731
P: ADJ. ZERO FAIL
!: # 731
Cause
Remedy / spare part
The process fluid density is
1. Ensure that there is no gas content in the process
outside the upper or lower
limit values set in the "EPD"
2. Adapt the values in the "EPD RESPONSE TIME"
function.
Causes:
– Air in the measuring tube
– Partly filled measuring
tube
The maximum current value
In particular with outgassing fluids and/or increased
for the measuring tube
gas content, the following measures are recommended
exciter coils has been
to increase system pressure:
reached, since certain process
1. Install the device at the outlet side of a pump.
fluid characteristics are
2. Install the device at the lowest point of an
extreme, e.g. high gas or solid
content.
The device continues to work
3. Install a flow restriction, e.g. reducer or orifice
correctly.
Frequency control is not
stable, due to
inhomogeneous process fluid,
e.g. gas or solid content.
Overdriving of the internal
Change or improve process conditions, e.g. by
analog to digital converter.
reducing the flow velocity.
Causes:
– Cavitation
– Extreme pressure pulses
– High gas flow velocity
A continuation of the
measurement is still possible!
The mass flow is too high.
Reduce flow.
The electronics' measuring
range will be exceeded.
The zero point adjustment is
Make sure that zero point adjustment is carried out at
not possible or has been
"zero flow" only (v = 0 m/s).
canceled.
CNGmass DCI MODBUS RS485
liquid.
function to the current process conditions.
ascending pipeline.
plate, downstream from the device.
Endress+Hauser
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