Siemens SITRANS F US Operating Instructions Manual page 49

Error/Symptoms
Device displays negative
flow
Current output does not work Internal electrical failure (open
Pulse/Frequency output does Internal electrical failure (open
not work
Relay output does not work
Device displays 0 flow.
Device status: "OK"
LCD display dark or partly
dark (missing characters)
Operation with infrared keys
not possible
SFIDK.PS.029.E5.02 / SW 2.01.07
Diagnosis
Interchange of transducer cable
connections
Wrong setting of measurement
direction
circuit, short circuit etc.)
circuit, short circuit etc.)
Internal electrical failure (open
circuit, short circuit etc.)
Process flow value is very low
compared with the low flow cut
off limit of the device
Internal electrical failure (open
circuit, short circuit etc.)
Light interference
Solution/Comment
Make sure that the transducer
cables are connected correctly:
1A → 1A
1B → 1B
2A → 2A
2B → 2B
Make sure that the setting of menu
3.1.5.1 is "+ direction".
Start simulation on the current
output by use of menu 2.4.4.
The instrument for measuring the
current is coupled in series with
the output (across the terminals).
Start simulation on the pulse/
frequency output by use of menu
2.4.2. The frequency measuring
instrument is coupled directly on
the terminals.
Start simulation on the relay
output by use of menu 2.4.3.
The instrument for measuring the
resistance is coupled directly on
the terminals.
Check the low flow cut off (menu
3.1.6), e.g. for testing, is set to 0.
Turn off power. Check the
connections for the power supply
PCBA and the flat cable for the
display module. Start display test
(menu 2.3.2) in case of partly dark
display.
Check that display is not dirty.
Check that display lid is locked
(PDM force control).
Bright auxiliary tools may be of
assistance.
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