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| ELECTRICAL CONNECTIONS 4 |
| SITRANS FX300 | |
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4.3Electrical connection of current and pulse output
•Current output:
In some cases, a shielded or twisted cable may be necessary. The cable shield may only be earthed (grounded) at one place (on the power supply unit).
•Pulse output:
When using the pulse output, two separate signal circuits are necessary if the pulse output is utilized together with analogue signals. Each signal circuit requires its own power supply. The total resistance must be adapted so that the total current Itot does not exceed 100 mA.
•Connection current output on terminals A, A+ Connection pulse output on terminals B, B+
Figure 4-2: Electrical connection of current and pulse output
1Power supply per signal circuit
2Optional display unit
3Load for HART® ≥ 250 Ω
4e.g. counter
The maximum load resistance is calculated as follows:
06/2009 - SFIDK.PS.050.F2.02 A5E02100423 | www.siemens.com/flow | 33 |