Siemens SITRANS FUS060 Operating Instructions Manual page 76

Troubleshooting/FAQs
9.1 Eliminating process errors
Symptoms
Flow not stable, and/or a flashing
"F" is displayed continuously/occa‐
sionally
Device displays negative flow, and/
or a flashing "F" is displayed con‐
tinuously/occasionally
Pulse/frequency output does not
work, and/or a flashing "F" is dis‐
played continuously/occasionally
Device displays 0 flow.
Device status: "OK"
LCD display dark or partly dark
(missing characters)
Operation with infrared keys not
possible
76
Diagnostics Cause
Air bubbles or particles
• Error "Measure‐
of any kind disturbing
ment path error" is
the measurement
pending (menu 2.1)
• Gain (menus
6.5.1.X) for the ac‐
Cable partly connected
tive paths > 250
• TOF (menus
6.5.5.X and
6.5.6.X) for the ac‐
tive paths is not sta‐
ble
• Error counters (me‐
nus 6.5.4.X) are not
equal to 0.
Ultrasonic echoes
- Transducer cables incor‐
rectly connected
Wrong setting of meas‐
urement direction
Error "P/F too high" is Internal electrical failure
pending (menu 2.1) (open circuit, short cir‐
cuit etc.)
Pulse/pause or frequen‐
cy out of range
Process flow value is
very low compared with
the low flow cut off limit
of the device
Internal electrical failure
(open circuit, short cir‐
cuit etc.)
Light interference
Remedy
Make sure that the pipe line is venti‐
lated and that the concentration of
particles is limited to a level at which
normal measurement with the meter
is possible.
Make sure that the transducer cables
are connected in the transmitter and
in the sensors (SONO 3200 or SONO
3300).
Check the connection of the cable
screening.
Make sure that the screen and center
pin is connected inside the transduc‐
er top.
Make sure that the entered path
lengths correspond to the measure‐
ment report.
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 pulse/
frequency output via menu 2.4. The
frequency measuring instrument is
coupled directly on the terminals.
Adjust pulse or frequency output set‐
tings (menu 4.2)
For testing, check the low flow cut off
(menu 3.1.6) is set to 0.
Turn off power. Check the connec‐
tions 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 assis‐
tance.
SITRANS FUS060 with PROFIBUS PA
Operating Instructions, 09/2021, A5E02225054-AD