Siemens SITRANS L 7ML5400 Operating Instructions Manual page 279

Symptom
Incorrect reading (mA output
and/or displayed value)
Relay not activating
Relay not activating correctly
No response when echo profile
requested via LUI (Echo Profile
(3.2.1.) (Page 246))
Configuration error 130 dis-
played
SITRANS LUT400
Operating Instructions, 04/2021, A5E33329501-AG
Possible Cause
Noise in the application
mA function not assigned to
correct measurement
When device configured for
flow: exponent or breakpoint
not correctly selected
Incorrect vessel or PMD dimen-
sions
Relay not programmed
Relay incorrectly assigned
Incorrect relay function selected
Incorrect relay setpoints
Relay incorrectly assigned
Incorrect relay function selected
Incorrect relay setpoints
Transducer is disabled.
Relay/pump configuration errors
- possible causes include:
• A relay is assigned to more
than one function (e.g. relay
2 is assigned to both an ex-
ternal totalizer and a pump).
• Pump setpoints are out of
order.
• Wall Cling adjustment range
is too large.
Diagnosing and Troubleshooting
11.4 Common Problems Chart
Action
Verify source and minimize. See
Noise Problems (Page 280).
Check mA assignment. See Cur-
rent Output Function (2.5.1.)
(Page 180).
Check configuration: if Sensor
Mode (2.1.2.) (Page 173) set to
FLOW, verify correct exponent
[Flow Exponent (2.15.3.2.)
(Page 236)] and breakpoints
[Universal Head versus Flow
(2.15.5.) (Page 241)].
For volume application: Verify
vessel dimensions. See Vessel
Shape (2.6.1.) (Page 184).
For flow application: Verify PMD
dimensions. See PMD Dimen-
sions (2.15.4.) (Page 239).
Program relay.
Verify with simulation. See Sim-
ulation (3.4.) (Page 262).
Verify with simulation. See Sim-
ulation (3.4.) (Page 262).
Verify setpoints.
Verify with simulation. See Sim-
ulation (3.4.) (Page 262).
Verify with simulation. See Sim-
ulation (3.4.) (Page 262).
Verify setpoints.
Set Transducer Enable (3.3.1.)
(Page 250) to ENABLED, then
request an echo profile.
• Verify that each relay is as-
signed to one function only.
Review relay assignments
under Pumps (2.7.)
(Page 189) and Other Con-
trol (2.11.) (Page 216).
• Verify that all 'ON' setpoints
are greater than their respec-
tive 'OFF' setpoints for pump
down applications (or vice
versa for pump up applica-
tions).
• Ensure range set in Level
Setpoint Variation
(2.7.2.1.2) (Page 192) has
not caused 'ON' or 'OFF' set-
points to overlap.
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