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56 Transmitter Configuration and Use: Series 1000 and 2000 Transmitters

Required Transmitter Configuration continued

6.5.4 Configuring the fault indicator and fault value

If the transmitter encounters an internal fault condition, it will indicate the fault by

sending a preprogrammed output level to the receiving device. You can specify the

output level by configuring the fault indicator. Options are shown in Table 6-9.

Note: By default, the transmitter immediately reports a fault when a fault is

encountered. You can delay reporting faults by changing the fault timeout. See

Section 8.12.

Example

Configuration:

• Primary mA output: Mass flow

• Frequency output: Mass flow

• AO cutoff for primary mA output: 15 g/sec

• Mass flow cutoff: 10 g/sec

As a result:

• If the mass flow rate drops below 15 g/sec but not below 10 g/sec:

•The primary mA output will report zero flow.

•The frequency output will report nonzero flow.

• If the mass flow rate drops below 10 g/sec, both outputs will report

zero flow.

Table 6-9 mA output fault indicators and values

Fault indicator Fault output value

Upscale 21–24 mA (default: 22 mA)

Downscale IS transmitters: 3.2–3.6 mA (default: 3.2 mA)

All other transmitters: 1.0–3.6 mA (default: 2.0 mA)

Internal zero The value associated with 0 (zero) flow, as determined by URV and LRV values

None Tracks data for the assigned process variable; no fault action

CAUTION

Setting the fault indicator to NONE may result in

process error due to undetected fault conditions.

To avoid undetected fault conditions when the fault

indicator is set to NONE, use some other mechanism

such as digital communication to monitor device status.

• Model 1500 AN

• Model 1700 AN

• Model 1700 IS

• Model 2500 CIO

• Model 2700 AN

• Model 2700 IS

• Model 2700 CIO

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Emerson MICRO MOTION 2700 Manual de instalación Pagina 66