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5.5
T
ROUBLESHOOTING
Event
Fault
Action
Error messages
“Tank full” status marker on*,
reading frozen at max. or min.
value
No fault. The level has reached (and possibly risen
above) the top configured measurement limit and is
either displaying the maximum (when measuring
level) or minimum (when measuring distance) output.
None.
Measurements should be normal once the level is in the configured
measurement range.
“Tank empty” status marker
on*, reading frozen at max. or
min. value
No fault. The level has entered the instrument’s
bottom dead zone and can no longer detect a return
signal. Either the maximum (when measuring
distance) or minimum (when measuring level) output
is displayed.
None.
Measurements should be normal once the level is in the configured
measurement range.
“Tank full” and “Level lost”
status marker on*, reading
frozen at max. or min. value
No fault. The level has entered the instrument’s top
dead zone and can no longer detect a return signal.
Empty the tank below the top measurement range limit and check the
measurement.
“Level lost” status marker on*,
reading is frozen
The instrument has lost the level signal, has searched
but not yet found the return pulse. This may occur if
the pulse has dropped below the threshold. Parasite
signals from the flange or obstructions in the tank may
render the instrument unable to identify the correct
signal.
Ensure that tank is emptied below maximum level and check the
measurement.
If the signal is not detected then modify the control threshold manually as
shown in sections 5.4.2 using the oscilloscope window and Measurement
optimization screen in HyView.
“Reference not found” status
marker on*
Occurs when there is a problem with the time base on
the HF board.
Please contact HYCONTROL.
“Level lost” and
“Reference not found” status
markers on*, reading frozen
The probe has received an electrostatic discharge.
The instrument will search for the level again and resume readings. If the
reading remains frozen then the signal converter may have been
damaged by ESD and may need replacing.
Please contact HYCONTROL.
“Flange not found” status
marker on*
The signal converter has been incorrectly configured
to measure with a cable or rod probe when it is
equipped with a coaxial probe. This may be also due
to installation on a long nozzle which has the effect of
attenuating the flange pulse.
Contact HYCONTROL for the corrective procedure.
Event
Fault
Action
“Delay out of limits” status
marker on*, reading is frozen.
The emitted pulse has not been detected.
The instrument will not work until it has been
found.
The signal converter may need replacing. Please contact HYCONTROL.
“Negative voltage error”*
Occurs when there is a problem with the time
base on the HF board.
Please contact HYCONTROL.
“VC01 voltage error” *
“VC02 voltage error” *
“Reprogramming FPGA” *
*Instrument connected to HyView software or HART® Handheld Controller (HHC) with Marker status window or list displayed
Event
Fault
Action
General operation
Instrument is not accurate
with a product that has a high
dielectric constant. A constant
offset is observed when taking
measurements.
Tank height is not correct.
Check current output and tank height parameters.
If the signal converter has been replaced, verify that factory calibration
parameters are still the same.
Ask HYCONTROL for the factory calibration sheet (if not supplied) and the
password for access to the factory menu.
The VF04 2-wire indicates an
incorrect level value.
The VF04 2-wire measures a non-valid reflection. Check the tank for obstructions and verify that the probe is clean.
In the case the indicated level is close to the nozzle, increase the detection
delay and the dead zone with the same ratio or increase the threshold level if
the full measurement range is essential.
In any case use the HyView oscilloscope function to visualise and to analyse
the application.
The threshold level must be adjusted so that it masks the disturbances. It also
gives enough margin for detection of the level pulse.
Very large pulses along the measurement signal
(same amplitude as the initial pulse) can be caused by a probe which is
touching the nozzle or the tank side (see section 4.2). Ensure that no contact
is possible.
Instrument is not accurate
when there are two or more
phases in the tank.
The instrument may be incorrectly configured for
this type of application i.e. it is measuring the
interface instead of the level.
Contact HYCONTROL for the corrective procedure or refer to the Service
Manual.
Check that Factory Menu function 1.1.3: Application Type is set to “2 liquids, 1
level”.
Check also that there is a layer of more than 100 mm of top product above
the bottom product.
