YOKOGAWA ADMAG AXR User Manual page 77

NOTE
Multiple ranges setting
Parameters from F20 to F31 are used with the
automatic multiple ranges. The followings will
describe the setting method for the range.
The multiple ranges use the following parameters:
[B23: Flow Span] Setting of the flow rate span
(Setting of the forward No.1 range)
[F20: Forward Span 2] Setting of the forward No.2
range
[F21: Reverse Span] Setting of the reverse range
[F30: Auto Range Hys] Setting of the automatic
multiple ranges hysteresis width.
[F31: Bi Direction Hys] Setting of the forward/
reverse flow measurement hysteresis width
Automatic multiple ranges switching
 When the instantaneous flow rate exceeds
100% of the range, transition to the next range
(up to two ranges) is carried out automatically.
Furthermore, when the flow is in reverse, the
reverse range is automatically selected.
 Range switching can be confirmed according
to the DO status output terminals. Read Table
6.4.1 for details of status output conditions for
each range.
Status Output for Automatic Multiple Ranges
Switching
Operations are performed in accordance with the
following table when the active mode has been set
to "Closed (On) Act" using F11: DO Active Mode.
Operating patterns are reversed when the active
mode has been set to "Open (Off) Act" using F11:
DO Active Mode.
Table 6.4.1 Status Output for Automatic Multiple
Ranges Switching
[F10]
Function
setting
No Forward single
Function range
Fwd/Rev Auto forward/
Rngs reverse range
Auto 2 Auto forward 2
Rngs ranges
*: "No Function" is the default value. Only DO is used for single
or dual ranges.
DO status
output
— —
Forward Open
Reverse Closed
Forward 1 range Open
Forward 2 range Closed
<6. PARAMETER DESCRIPTION>
Parameter setting sequence
(for automatic multiple ranges switching)
F10: DO Function
Select a function.
F11: DO Active Mode
Select whether DO output is to be "Closed (On) Act"
or "Open (Off) Act".
Select a function (Note 1)
No Function: Output is stopped
Fwd/Rev Rngs: Forward/reverse flow rate
measurement
Auto 2 Rngs: Automatic 2-ranges switching
B23: Flow F20: Forward
Span Span 2
Forward No.1 range Forward No.2 range
Set the spans for the ranges to be used.
No.1 range ≤ No.2 range
If "instantaneous flow rate % (FR)" is selected for
Display Mode and A10: FLOW RATE (%) is selected
for BRAIN communication, the instantaneous flow rate
% and following symbols will be displayed only for
multiple ranges and forward/reverse flow measurement.
Forward No.1 range: [F1]
Forward No.2 range: [F2]
Output
No. 1 range
10% of No. 1 range (set using F30)
Reverse
Minimum span % within
forward/reverse (set using F31)
Figure 6.4.1 Multiple Ranges and Hysteresis Widths
6-26
Read Table 6.4.1
and set F10
F21:Reverse
Span
Reverse range
Reverse : [R1]
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No. 2 range
100%
Input
Forward
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IM 01E30D01-01EN