Azbil SDC35 - Page 64

5-4
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
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Temperature unit
When the PV input range type is thermocouple or RTD, the temperature unit can
be selected.
Item (Bank) Display Contents Initial value User level
Temperature unit
(Setup bank)
0: Celsius (˚C)
1: Fahrenheit (˚F).
0 Basic,
Standard,
High function
• When the PV input range type is thermocouple or RTD, the display and setting
can be configured.
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Cold junction compensation (T/C)
When the PV input range type is thermocouple, either of the following can be
selected:
• The cold junction compensation (T/C) is performed inside this unit.
• The cold junction compensation (T/C) is not performed inside this unit since
an external cold junction compensation unit, such as ice bath is used.
Item (Bank) Display Contents Initial value User level
Cold junction
compensation (T/C)(Setup
bank)
0: Cold junction compensation (T/C) is
performed (internal).
1: Cold junction compensation (T/C) is not
performed (external).
0 High function
• When the PV input range type is thermocouple, the display and setting can be
configured.
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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".
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
• 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.