Fault Finding; Error Detection; Typical Errors; Flow Transmitter With Pd 210 Display Unit - Proces-Data PD 340 Manual

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9 Fault finding

9.1

Error detection

The PD 340 Flow Transmitter is equipped with a comprehensive self testing system, which
is able to indicate faults arising from improper use of the transmitter, or faults arising whilst
the transmitter is in use.
When the internal test system registers a fault, an error code, in the form of a number, is
generated within the Flow Transmitter. If several errors in the error checking system should
develop at the same time, only the highest numbered error is saved.
The error may be observed in different ways.
PD 210 display unit
The user is informed by an "A" for ALARM appearing in the first digit of the display. By
pressing the "TEST" button, the display will show an error code of two digits, indicating the
type of error. The test system ensures that the alarm will not be cancelled before the error
code has been displayed by pressing the "TEST" button, even though the error may have
disappeared. By pressing the "TEST" button once again, the display will show "0" if the
Flow Transmitter is currently error free. The error code on the display is only updated by
re-pressing the "TEST" button.
PD 4000 Flowmeter-Display
If an error occurs, the error will be recorded and shown in the display in clear text. Only
errors from the Flow Transmitter currently shown in the display will appear. For example, if
an error occurs in a transmitter, which is not currently being displayed, the error text will not
be displayed until that transmitter is selected.
P-NET
If an error occurs, any reply from the Flow Transmitter will include an error indication, as
long as an error code remains present. The error code is cleared by reading the Error3 reg-
ister.
9.2

Typical errors

9.2.1

Flow Transmitter with PD 210 display unit

If neither the transmitter nor the display unit functions
•
Check that the light-emitting diode in the terminal box is on.
•
Check that the transmitter is correctly connected.
•
Check that the supply voltage at the Flow Transmitter is at least 20 V AC or DC,
when the transmitter is powered up (with the terminal box mounted on the transmitter).
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