Siemens SITRANS FST030 - Page 92

Symptoms / Alarms Diagnostics Cause Remedy
Flow rate appears to be cor‐
rect, but sign (flow direction)
is wrong
No Alarm codes
● Nothing unusual
Upstream / downstream sen‐
sor cables reversed at fron‐
tend or sensors.
Verify that the upstream sen‐
sor is connected to the up‐
stream F-connector on the
frontend (labeled A).
Flow direction parameter is
set to "negative" flow.
Change selection in Setup >
Sensor > Flow direction.
Zero point adjustment fails Delta-time is too high due to
flow in the pipe.
Verify that flow is completely
stopped before performing
the Zero point adjustment.
Path being zeroed is not in
measurement state.
Confirm that the path(s) are
installed properly and provid‐
ing stable flow measurement.
Defective sensors (excessive
zero offset)
Check sensors (e.g. using a
"Test block" see A1
(Page 93)).
Troubleshooting Symptoms: (Hardware issues)
Symptoms / Alarms Alarm codes Cause Remedy
Display is completely blank,
but communications is still
possible on the service chan‐
nel.
Display cable disconnected
from Transmitter module or
cable is broken.
1. Check cable connections
between display and
Transmitter module.
HMI module defective Contact Technical Support
Display is completely blank
and communication with serv‐
ice channel is not possible
No power to unit / defective or
disconnected PSU or Trans‐
mitter module
1. Check mains power
connection.
2. Verify that PSU and
transmitter modules are
fully plugged into
backplane.
Keypad is not responsive Enclosure lid is not complete‐
ly closed or display is not tight
against glass window.
Check tightness of lid screws.
Cycle power and allow sever‐
al seconds for auto recalibra‐
tion of keypad.
Datalogger and backup not
working
181: SensorFlash Error indicates failed chkdsk.
Possible failed SD card.
1. Remove and try to repair
the SD card in a PC.
2. Replace SD card if repair
unsuccessful.
SD card not installed
1. Insert SD card
2. Verify the SenorFlash is
recognized as being
installed: menu 3.7.2
Connected to the SD card as
mass storage device (MSD)
Detach the USB cable
SensorFlash does not work
as MSD (Mass Storage De‐
vice).
MSD not enabled for US mar‐
ket
Diagnostics and troubleshooting
9.2 Troubleshooting Guide
SITRANS FST030 (Modbus)
92 Operating Instructions, 08/2018, A5E37367739-AD