Yokogawa ADMAG AXR - Manual (Page 74)

<6. PARAMETER DESCRIPTION>
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IM 01E30D01-01EN
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
n 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.
n Range switching can be confirmed according to
the DO status output terminals. Refer to Table
6.4.1: Status Output for Automatic Multiple
Ranges Switching 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]
setting
Function
DO status
output
No
Function
Forward single
range
— —
Fwd/Rev
Rngs
Auto forward/
reverse range
Forward
Reverse
Open
Closed
Auto 2
Rngs
Auto forward 2
ranges
Forward 1 range
Forward 2 range
Open
Closed
*: “No Function” is the default value. Only DO is used for single
or dual ranges.
Parameter setting sequence
(for automatic multiple ranges switching)
F0603.ai
F10: DO Function
Select a function.
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
Refer to Table 6.4.1
and set F10
B23: Flow
Span
Forward No.1 range
F20: Forward
Span 2
Forward No.2 range
F21:Reverse
Span
Reverse range
F11: DO Active Mode
Select whether DO output is to be “Closed (On) Act”
or “Open (Off) Act”.
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] Reverse : [R1]
Forward No.2 range: [F2]
Set the spans for the ranges to be used.
No.1 range ≤ No.2 range
Input
100%
No. 1 range
No. 2 range
Output
Reverse Forward
Minimum span % within
forward/reverse (set using F31)
F0604.ai
10% of No. 1 range (set using F30)
Figure 6.4.1 Multiple Ranges and Hysteresis Widths