Yokogawa AXFA14G/C - Manual (Page 41)

IM 01E20C02-01E 6-12
6. PARAMETER DESCRIPTION
6.4 Parameter Description
(1) Menu B: Easy Setup items
Those parameters with a high frequency of use have
been grouped together in Easy Setup. All basic
functions can be controlled using only the parameters
from this block. Parameters from Menu B share
identical names with those from other menus; however,
modification of one such parameter will result in the
other being automatically modified.
[B10: Language] Selection of language used for the
display unit
→ This setting is linked with that of parameter H30.
One of the following languages can be selected for the
display unit.
Data Range
Setting item Description
English
Japanese
French
German
Italian
Spanish
T0614.EPS
All parameters, alarm messages, etc. displayed in
English.
All parameters, alarm messages, etc. displayed in
Japanese katakana.
All parameters, alarm messages, etc. displayed in
French.
All parameters, alarm messages, etc. displayed in
German.
All parameters, alarm messages, etc. displayed in
Italian.
All parameters, alarm messages, etc. displayed in
Spanish.
[B20: Flow Damping] Setting of the damping time
constant
→ This setting is linked with that of parameter C11.
The damping time constant should be modified to
suppress an output fluctuation or to change the re-
sponse time. This time constant has an effect on analog
output and on the flow rate display (i.e., actual instan-
taneous flow rate, %, current value), and in addition, it
also affects pulse output and totalization. However,
when “No Damping” has been set for J24: T/P Damp
Select, there will be no effect on pulse output or
totalization.
* Time constant: The time required for the output to
reach 63.2% from 0%.
[B21: Base Flow Unit] Selection of flow units for the
flow rate span
→ This setting is linked with that of parameter C40.
This parameter selects the flow units for the flow rate
span. (In case of mass flow, the setting of density is
also required. Refer to C46: Mass Flow Density
for more details.)
[B22: Base Time Unit] Selection of time units for
the flow rate span
→ This setting is linked with that of parameter C41.
This parameter selects the time units for the flow rate
span; however, if “m” has been selected for the flow
rate units, “/s” is automatically set for this parameter.
[B23: Flow Span] Setting of the flow rate span
→ This setting is linked with that of parameter C42.
The span can be set for the forward flow rate in the
range 0 to 32,000 (although this does not include 0). The
units set using B21/C40: Base Flow Unit and B22/
C41: Base Time Unit will be displayed at this time.
NOTE
If the flow rate units, time units, and flow rate
span are specified upon ordering, these param-
eters will be setup before shipment; however, if
this is not the case, it will be necessary for the
appropriate values to be set up by the user.
NOTE
Flow rate span is the value for instantaneous
flow rate that corresponds to a current output of
20 mA. The following factors should be taken
into consideration when deciding on the flow rate
span.
• In the case of applications with large variations
in flow rate, the maximum flow rate should be
set. If a flow rate in excess of the flow rate
span was to occur, output would be possible
up to an upper limit of 108%, and beyond this,
error would occur. Note that the same applies
to pulse output and totalization.
• In the case of applications that have a rela-
tively stable flow rate, a flow rate span of 1.5 to
2.0 times larger than the normal flow rate may
be considered suitable.
• The flow rate to be adopted should - upon
conversion to flow velocity - correspond to a
value within the range of 0.1 to 10 m/s. The
flow velocity can be confirmed using sizing data
or with parameter C44: Velocity Check, and in
the latter case, the value obtained when span is
converted to flow velocity will be displayed.
• Regardless of the position of the decimal point,
the largest value that can be set on the display
unit is 32,000. Furthermore, it is not possible to
set a number of 4 or greater for the highest-
order digit. Similarly, if 3 is set for this highest-
order digit, it will not be possible to set a