IM-P192-02 MI Issue 2 49
7. Fault finding
Many faults which occur on commissioning are found to be due to incorrect wiring or setting up,
therefore it is recommended that a thorough check is carried out should there be a problem.
The TVA owmeter display has in-built diagnostic features and will indicate a number of
errors on the display and via the 4-20 mA output.
The errors will alternate with the normal run mode display and will be shown according to
priority. The errors will be latched and can only be cancelled by pressing the 'OK' button.
Once the error message has been cancelled the display will show the next (if any) error.
Any continuous error will re-instate itself 2 seconds after it has been cancelled, and will be
indicated by a flashing exclamation mark (!).
Symptom Possible cause Action
Display is blank dc voltage is not within
the range of 9-28 Vdc.
Supply connected with
reverse polarity.
Electronics faulty.
Check power supply/current
connections. See Section 3.3.
Change polarity.
Refer to: Spirax-Sarco Limited
Display shows:
NO SIGNL
Insufficient supply
voltage.
Current loop resistance
is greater than Rmax.
Electronics faulty.
Check supply voltage is between 9 and
28 Vdc.
Check current loop resistance and
reduce if necessary.
Check current output electronics (refer
to Sections 4.6, 4.7 and 4.8).
Refer to: Spirax-Sarco Limited
Display shows:
POWER Out
Power supply
interrupted.
Ensure power supply is secure and
cancel error using the OK key.
Totals transmitted may not be valid.
Display shows:
SENSR CONST
Cone jammed.
Electronics Faulty.
Remove unit from pipeline and check
cone movement.
Check current output electronics (refer
to Sections 4.6, 4.7 and 4.8).
Refer to: Spirax-Sarco Limited
Display shows:
HIGH FLOW
Meter undersized. Check sizing and replace
if necessary.
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