Endress+Hauser HART Proline Promass 83, Operating Instructions Manual

Page: 96 / 148

Troubleshooting Proline Promass 83
96 Hauser
9.5 Response of outputs to errors
!
Note!
The failsafe mode of totalizers, current, pulse and frequency outputs can be customized by
means of various functions in the function matrix. You will find detailed information on
these procedures in the "Description of Device Functions" manual.
You can use positive zero return to set the signals of the current, pulse and status outputs to
their fallback value, for example when measuring has to be interrupted while a pipe is being
cleaned. This function takes priority over all other device functions. Simulations, for
example, are suppressed.
Failsafe mode of outputs and totalizers
Process/system error is present Positive zero return is activated
"
Caution!
System or process errors defined as "Notice messages" have no effect whatsoever on the inputs and outputs. See the information on
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37
Current output MIN. CURRENT
The current output will be set to the lower value of the signal on alarm level
depending on the setting selected in the CURRENT SPAN (see the "Description of
Device Functions" manual).
MAX. CURRENT
The current output will be set to the higher value of the signal on alarm level
depending on the setting selected in the CURRENT SPAN (see the "Description of
Device Functions" manual).
HOLD VALUE
Measured value display on the basis of the last saved value preceding occurrence of
the fault.
ACTUAL VALUE
Measured value display on the basis of the current flow measurement. The fault is
ignored.
Output signal corresponds to "zero flow"
Pulse output FALLBACK VALUE
Signal output
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no pulses
HOLD VALUE
Last valid value (preceding occurrence of the fault) is output.
ACTUAL VALUE
Fault is ignored, i.e. normal measured value output on the basis of ongoing flow
measurement.
Output signal corresponds to "zero flow"
Frequency output FALLBACK VALUE
Signal output
→
0 Hz
FAILSAFE VALUE
Output of the frequency specified in the FAILSAFE VALUE function.
HOLD VALUE
Last valid value (preceding occurrence of the fault) is output.
ACTUAL VALUE
Fault is ignored, i.e. normal measured value output on the basis of ongoing flow
measurement.
Output signal corresponds to "zero flow"
Totalizer STOP
The totalizers are paused until the error is rectified.
ACTUAL VALUE
The fault is ignored. The totalizer continues to count in accordance with the current
flow value.
HOLD VALUE
The totalizers continue to count the flow in accordance with the last valid flow value
(before the error occurred).
Totalizer stops
Relay output In event of fault or power supply failure: relay
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de-energized
The "Description of Device Functions" manual contains detailed information on relay
switching response for various configurations such as error message, flow direction,
EPD, full scale value, etc.
No effect on the relay output