Value for 4 mA and
20 mA
The 4mA (V0H5/V4H5) and 20 mA (V0H6/
V4H6) values, default values 0% and
100%, determine the levels at which the
analogue signal range begins and ends.
Example:
4 mA = 20%,
20 mA = 80%
#
Matrix Entry
Remarks
1
V0H5
20
4mA value, 20 %
2
-
»E«
Register entry
3
V0H6
80
20 mA value, 80%
4
-
»E«
Register entry
Note!
•
Set in calibration/linearisation units
•
When V0H3/V4H3 = 0, then
V0H5/V4H5 = 0 mA value
Output on alarm
The analogue outputs can be set such that
they take on distinctive values when a fault
with alarm is detected. Depending upon
the setting in V1H3/V5H3, the relays may
also follow them. The entry is made in
V0H7/V4H7:
•
0 = -10% of signal range
•
1 = +110% of signal range (default)
•
2 = last value is held
Example:
Output -10 % on alarm
#
Matrix Entry
Remarks
1
V0H7 0
-10% on alarm
2
-
»E«
Register entry
The current values set on an alarm are shown in the table
V0H3/V4H3 =
Current on alarm when V0H7/V4H7 =
0: (-10%)
1: (+110%)
2: hold
0: 0
…
20 mA
≤
-2 mA
≥
22.0 mA
last value
1: 4
…
20 mA
≤
-2 mA
≥
22.0 mA
last value
Caution!
•
If setting 2 is chosen, the fault recognition system on the 0/4
…
20 mA signal line is
effectively deactivated. Although the transmitter recognises a fault, i.e. the alarm
relay de-energises and the associated LED lights, the signal output to any follow-up
instrumentation appears to indicate a correct measured value.
Output 2 assignment
Field V8H2 is activated in operating modes 0, 3 and 5. Do not change the settings —
the function intended for the field is not required in the applications described in this
manual.
0%
100%
V0H5
V4H5
V0H6
V4H6
le
v
e
l
0/4 mA
20 mA
BA143_31
Fig. 4.9:
Value for 4 mA and 20 mA, V0H5/V4H5 and
V0H6/V4H6
t
-2
4
0
22
20
V0H7/V4H7
1 = +110%
2 = hold value
mA
BA143_39
0 = -10%
alarm
Fig. 4.10:
Output on alarm, V0H7/V4H7
Note!
Channel 2
V4H5
⇓
V4H6
Channel 2
V4H7
Caution!
Prolevel FMC 662
Chapter 4: Level Measurement
Hauser
29
Содержание Prolevel FMC 662
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