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•
Active mode:
the signal converter supplies the power for the operation (selection) of receiver instruments,
observe max. operating data (terminals
E+
and
E-
).
•
Passive mode:
the operation (selection) of receiver instruments requires an external power supply (
U
ext
),
observe max. operating data
•
Connection diagrams
of outputs and inputs are shown in
sect. 2.5.6.
•
For
operating data
of outputs and inputs please refer to
sect. 10.2.1.
2.5.2
Current output I
•
The continuously active
current output is electrically isolated
from all others circuits.
•
All operating data and functions are adjustable
.
•
Allowed load:
15-500
Ω
•
Selfcheck:
-interrupting the mA loop, and
-
short-circuit of mA loop via test function, see Fct. 2.03
or when power supply is switched on in Fct. 3.07
Error message on display (Fct. 1.04) and/or status output (Fct. 1.07-1.10).
•
Current value for error identification
is adjustable, see Fct. 1.05.
•
Range change-over,
automatically or externally by control input, see Fct. 1.07-1.10 and 1.11-12.
Setting range from 5-80% of Q
100%
(Corresponding low to high range ratio from 1:20 to 1:25).
Change-over from high to low range at approx. 85% of low range and vice versa at approx. 98% of low range.
The active range is signaled via one of the four status outputs.
•
Forward / reverse flow measurement
(F/R mode) is possible.
•
Connection diagrams see sect. 2.5.6.
2.5.3
Pulse outputs P and A1
2.5.3.1 Pulse output P for electronic totalizers
•
Pulse output P is electrically isolated
from all other circuits
•
All operating data and functions are adjustable,
see Fct. 1.05.
•
Active mode:
uses the internal power supply, terminals E+/E-
Passive mode:
requires external power supply, U
ext
<32 V DC / 24 V AC, I
≤
30 mA
•
Max.
adjustable frequency 10 kHz
•
Scaling
in pulses per unit time (e.g. 1000 pulses/s at Q
100%
flow) or
in pulses per unit volume (e.g. 100 pulses/m
3
or US Gal).
•
Pulse width
symmetric, pulse duty factor 1:1, independent of output frequency,
automatic, with optimum pulse width,
pulse duty factor approx. 1:1 at Q
100%
, or
pulse width range from 0.01 to 1 s adjustable as required for correspondingly lower output frequency.
•
Forward / reverse flow measurement
(F / R mode) is possible.
•
Connection diagrams see sect. 2.5.6
•
Schematic wiring diagram for pulse output P
for electronic totalizers.
Similar to a relay contact, this pulse output switches direct and alternating voltages.
P
P
