Yamatake SDC35, User Manual

Page: 62 / 280

5-4
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
■
PV square root extraction dropout
When the PV input range type is DC voltage or DC current, a dropout value can be
set so that the result of the PV square root extraction used to convert the pressure
(differential pressure) into the flow becomes "0".
• When the PV input range type is DC voltage or DC current, the display and
setting can be made.
• Details of PV square root extraction
The calculation input in % and the calculation result in % are expressed as PVin
and PVout, respectively.
When the PV input is the PV square root extraction dropout set value or more
and less than 100.0%, the control formula becomes as shown below.
PVout =
√
PVin/100
X
100
When the PV input is larger than 0.0% and smaller than the PV square root
extraction dropout set value, PVout = 0.0%.
When the PV input is 0.0% or less or 100.0% or more, the square root extraction
is not performed. Therefore, PVout = PVin.
Item (Bank) Display Contents Initial value User level
PV square root extraction
dropout
(Setup bank) 0.0%: Square root extraction is not performed.
0.1 to 100.0% 0.0% High function
Output after PV square root extraction (PVout)
100%FS
PVin
Dropout value (variable change from 0.1 to 100.0%)
0
100%FS
0
Y = Xin/100 X100