Dynisco IPX II Series, Руководство по эксплуатации

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42
COMMISSIONING
T TT
TTab
ab
ab ab abllllle 7
e 7
e 7 e 7 e 7-----2
2
2 2 2
Output Cable Wiring Specifications Output Cable Wiring Specifications
Output Cable Wiring Specifications Output Cable Wiring Specifications Output Cable Wiring Specifications
7.1.5 7.1.5 7.1.5 7.1.5 7.1.5
C C
C C C
O O O O O
UTPUT UTPUT
UTPUT UTPUT UTPUT
T TT TT
ERMINALS ERMINALS
ERMINALS ERMINALS ERMINALS
/C /C /C /C /C
ABLE ABLE
ABLE ABLE ABLE
The output terminals are connected to a power supply having a nominal 24 V dc voltage and
capable of supplying 100 mA for the IPX II. In the analog mode, these units require a maximum of
only 24 mA. Optionally a load resistor, typically 2
2 2 2 250 50 50 50 50
Ω Ω Ω Ω Ω
, may be connected in series with either
terminal of the pressure transmitter (for HART digital communications with the IPX II, this 250
Ω
resistor is required). The maximum series resistance in the circuit (including wiring lead resistance) can
be calculated using the formula:
Table 7-3 gives maximum series resistance:
T TT TTab ab ab ab abllllle 7 e 7 e 7 e 7 e 7-----3 3 3 3 3 Maximum Series Resistance Maximum Series Resistance Maximum Series Resistance Maximum Series Resistance Maximum Series Resistance
7.1.5 7.1.5
7.1.5 7.1.5 7.1.5
D D
D D
D
C C
C C C
A S E A S E
A S E A S E
A S E
G G
G G G
R O U N D R O U N D
R O U N D R O U N D
R O U N D
For safety, optimum performance and EMI immunity the case of the instrument should be connected
to a good local earth ground. When using grounded sensors that are connected to the local electrical
ground, the pressure transmitter case should be connected to that same ground point.