User's Manual

SITRANS LR250 (FOUNDATION FIELDBUS)
Operating Instructions, 01/2014, A5E32221411-AB
187
Diagnosing and troubleshooting
10
1. Check the following:
– There is power at the device.
– The LCD shows the relevant data.
– If any fault codes are being displayed see General Fault Codes (Page 190) for a detailed
list.
2. Verify that the wiring connections are correct.
3. See the table below for specific symptoms.
Symptom
Corrective action
The device cannot be programmed
via FF.
• Make sure
Remote Lockout (6.1.1.)
is set to the
unlock value
• Ensure block is Out of Service
You try to set a SITRANS LR250
parameter via remote communications but
the parameter remains unchanged.
• Ensure
Remote Lockout (6.1.1.)
is disabled.
• Ensure
Write Protection (6.2.1.)
is set to the unlock
value.
• Ensure block is Out of Service
The AIFB output equals the display value
but does not correspond to actual material
level.
• Ensure the Channel selection and Scaling in AIFB 1
are correctly entered
• Ensure AIFBs are scheduled and in Auto mode
• Ensure High Calibration Point is correctly entered
• View the echo profile to see if the wrong echo is
being selected. If so, see Operation Troubleshooting
(Page 195) for possible causes and corrective action
The AIFB output is not equal
to the displayed value (regardless of
actual material level).
• Confirm you are looking at the AIFB Output
• Ensure AIFBs are scheduled and in Auto mode
• Ensure scaling has not been programmed into the
controller: all scaling should be performed by the
LR250
• Check the network to ensure the controller is
communicating with the LR250
Not able to change parameters via LUI.
• Ensure
Local Operation (6.2.3.)
is enabled
Not able to change parameters,
such as low calibration point.
• Ensure block is in Out of Service mode