KROHNE ALTOFLUX IFM 4080 K EEx EN - Manual (Page 9)

8
The PE (or FE) conductor must be connected to the press-fitted M5 clamp terminal marked
inside the terminal compartment. This conductor must be guided through the rectangular
opening in the metal dividing plate that separates the non-intrinsically safe power supply
terminals from the intrinsically safe signal in-/output terminals.
2.3.1 Connection diagrams MODIS
Section 7 shows the block diagram of the IFM 4080 K/ i…-EEx magnetic-inductive compact
flowmeter. The power supply (terminals 1L½, 0L½) is connected via cable B. The PE terminal
must be connected to the protective earth conductor of the mains supply.
The IFC 090i-EEx electronics unit is provided with intrinsically safe signal in-/output
circuits due to the installed pair of MODIS modules in accordance with the table below.
Module Terminal designation Function / Intrisically safe maximum data
P-SA I
⊥
, I
Current output (0/4-20 mA), passive
U
i
= 30 V, I
i
= 250 mA, P
i
= 1.0 W
C
i
= 5 nF, L
i
≈
0
FA-ST B1, B1
⊥
or B2, B2
⊥
Pulse (frequency) output or status in-/output, all passive
The function can be set by software
U
i
= 30 V, I
i
= 250 mA, P
i
= 1.0 W
C
i
= 5 nF, L
i
≈
0
F-PA D, D
⊥
Fieldbus module, type Profibus system, passive
U
i
= 30 V, I
i
= 300 mA, P
i
= 4.2 W
C
i
= 5 nF, L
i
≈
0
F-FF D, D
⊥
Fieldbus module, type Fieldbus Foundation, passive
U
i
= 30 V, I
i
= 300 mA, P
i
= 4.2 W
C
i
= 5 nF, L
i
≈
0
DC-I
(see note)
I +, B1+
Intrinsically safe voltage source for the passive module
P-SA or FA-ST, so that active operation is possible.
U
o
= 23.5 V, I
o
= 98 mA, P
o
= 0.6 W
C
o
= 132 nF 1 , L
o
= 4 mH
Table 7: Overview of MODIS modules.
NOTES:
•
Besides the shown intrinsically safe maximum values for voltages and current -which are
based on certain fault conditions as prescribed by the standard EN 50 020 - the nominal
values for current and voltage must also be respected otherwise a proper funtioning of
the modules is not guaranteed! See table 8 for the nominal values.
•
The active module DC-I is needed in the 24 Vac/dc power supply version to form an
active current or pulse output in combination with one of the passive modules P-SA or
FA-ST. Due to limited space it is not available for 100...230 Vac supply versions.
Table 9 shows the possible combinations of the installed MODIS modules for the 24 Vac/dc
power supply version of the IFC 090i-EEx and table 10 for the 100-230 Vac version.
1
When modules P-SA (or FA-ST) and DC-I are connected in series, the internal capacitance C
i
of 5 nF must be
subtracted from the C
o
of 132 nF. So the data plate will list a C
o
of 127 nF.