Yokogawa AXFA14G/C - Manual (Page 61)

IM 01E20C02-01E 6-32
6. PARAMETER DESCRIPTION
Example 1: Step input
F0614.EPS
10 %
1 %
Step signal
Flow rate value
after rate limit
processing
63.2 %
100 225
Dead time: 3 s
Input: 0 to 10%
Damping time constant: 3 s
Dead time: 3 s
Rate limit value: 1%
Number of signal samples
Flow rate value after
damping (a)
(b)
(c)
(d)
(1) In comparison with the previous value at (a), it is
determined that the signal is in excess of the rate
limit value and the response becomes 1%. How-
ever, the actual output applies damping, and
therefore the output turns out to be as indicated by
the solid line.
(2) Subsequent flow values within the dead time zone
correspond to signals of post-damping flow value
+ rate limit value (1%).
(3) Since input signals do not return to within the rate
limit value during the dead time, it is determined at
(c) that this signal is a flow rate signal.
(4) The output signal becomes a damped curve and
compliance with the step signal begins.
Three seconds after determination of a flow rate
signal in the above figure, a level of 63.2% is
reached.
Example 2: Slurry noise
F0615.EPS
+1 %
-1 %
Dead time: 1 s
Flow rate value after damping
Flow rate value
after rate limit
processing
Slurry noise
Input: 0 to 10%
Damping time constant: 1 s
Dead time: 1 s
Rate limit value: 1%
Time
In the figure on the left, it is
determined that the slurries
noise signal is not a flow rate
signal.
[J23: Pulsing Flow] Selection of pulsing flow
support
In a situation where pulsating flow causes error in the
average flow value, due to the application of a plunger
pump, this parameter provides functionality whereby
calculation is controlled and variations in flow rate are
followed.
Setting Function
Normal
Support for pulsing flow
No
Yes
T0637.EPS
[J24: T/P Damp Select] Setting of damping opera-
tion
This parameter is used to select that the flow rate value
obtained through damping calculation for totalization
and pulse output or the instantaneous flow rate value
(no damping) for totalization and pulse output.
Setting Function
Damping
No damping
Damp
No Damp
T0653.EPS
[J30: Power Synch] Setting of power synchroniza-
tion
This parameter sellects whether or not the internal
frequency is to be synchronized with that of the power
supply.
Setting Function
Not synchronized
Synchronized
No
Yes
T0639.EPS
[J31: Power Frequency] Setting of power fre-
quency
When “Yes” (i.e., in synchrony) has been selected for
J30: Power Synch, this parameter is used to display
the power supply frequency. If “No” (i.e., not synchro-
nized) has been selected, the power supply frequency is
to be specified.
IMPORTANT
In situations where a DC power supply is used
for converters, set the local commercial power
frequency in area where the converter is in-
stalled.
Set “No” for J30: Power Synch and the local
commercial power frequency for J31: Power
Frequency.
Following settings are necessary by power supply and
by flow tube size.
Power Supply Code 1
(100 to 240 V AC or 100 to 120 V DC)
T0642-1.EPS
J30
J31
J30
J31
Size 2.5 mm (0.1 in.)
to 400 mm (16 in.)
Power synchronous (Yes)
No setting
Power asynchronous (No)
Local commercial power frequency AC
power supply
DC
power supply
Power Supply Code 2 (24 V AC/DC)
T0642-2.EPS
J30
J31
J30
J31
Size 2.5 mm (0.1 in.) to 400 mm (16 in.)
Power asynchronous (No)
Local commercial power frequency
Power asynchronous (No)
Local commercial power frequency
AC
power supply
DC
power supply