KROHNE IFC 020 Converter EN - Manual (Page 70)

Installation and operating instructions IFC 020
10.3 IFC 020 signal converter
10/3
Versions with display / control elements HART ® and RS 485 interfaces
IFC 020 K Compact version,converter directly mounted on the signal
converter version
IFC 020 F Seperate housing fieldversion
IFC 020 E Seperate housing, 19” Plug-in unit
Current output
Function – all operating data settable, galvanically isolated
Current: ranges 0 – 20 mA and 4 – 20 mA
Active mode max. 500 Ω load
Passive mode external voltage: 15 ... 20 V DC 20 ... 32 V DC
load: min. ... max. 0 ... 500 Ω 250 ... 750 Ω
Error identification 0 / 3.6 / 22 mA and variable
Forward/reverse flow measurment direction identified via status output
Pulse output
Function – all operating data settable, galvanically isolated
– digital pulse division, interpulse period non-uniform,
therefore if frequency and cycle meters connected
allow for minimum counting interval:
gate time, totalizer ≥
Pulse rate for Q=100% 10, 100 or 1000 pulses/sec.(=Hz), blocked or to your choice
per m 3 , Litre US Gallons or freely selectable unit.
Activ mode connection: electronic totalizers
voltage: approx. 15 V DC, from current output
load: I
max
< 23 mA, operation without current output
load: I
max
< 2 3 mA, operation with current output
Passive mode connection: electronic or electromechanical totalizers
voltage: external, U
ext
≤ 32 V DC/ ≤ 24 V AC
load: I
max
≤ 150 mA
Pulse width – 50, 100, 200 or 500 msec.,selectable at frequencies < 10Hz
– symetric at frequencies < 10Hz
Forward/reverse flow measurement flow direction identified via status output
Status output (passive)
Function settable as indicator for flow direction, errors or trip point
Connection voltage: external, U
ext
≤ 32 V DC/ ≤ 24 V AC
load current: I
max
≤ 150 mA
Control input (passive)
IFC 020 E only
Function – adjustable for totalizer reset, or reset setting
outputs to min. values
– initiate function by “low” or “high” control signals
Control signals U
max
: 24 V AC 32 V DC (any polarity)
low: ≤ 1,4 V ≤ 2 V
high: ≥ 3 V ≥ 4 V
Time constant 0.2 – 99.9 s, adjustable in increments of 0.1 second
Low-flow cutoff Cutoff “on” value: 1 – 19% of Q
100%
, adjustable
Cutoff “off” value: 2 – 20% in 1% increments
1000
P
100%
[Hz]
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