4 ELECTRICAL CONNECTIONS |
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SITRANS FX300 |
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4.3.1 Power supply
INFORMATION!
The supply voltage has to be between 14 VDC and 36 VDC. This is based on the total resistance of the measuring loop. To determine this, add up the resistances of each component in the measuring loop (not including the measuring device).
The required supply voltage can be calculated using the formula below:
Uext. = RL * 22mA + 14V
where
Uext. = the minimum supply voltage and
RL = the total measuring loop resistance is.
INFORMATION!
The power supply has to be able to supply a minimum of 22 mA.
4.3.2 Totalizer / pulse output
The basic units for the totalizer and the pulse output are m3 for volume,
m3norm. for standard volume and kg for mass.
The unit and the conversion factor can be changed in menu item 3.2.8 "Conf.Tot". User specific units (User Def.) can also be entered but the conversion factor must always be entered based on the base unit. For a sample calculation see chapter 6.2.5 "Change units".
The maximum frequency of the pulse output is 0.5 Hz.
Figure 4-3: Pulse output
1fmax ≤ 0.5 Hz
2closed
3open
4Pulse ≥ 250 ms
34 | www.siemens.com/flow | 06/2009 - SFIDK.PS.050.F2.02 A5E02100423 |