Azbil SDC35 - Page 66

5-6
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
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PV range low limit/high limit
When the PV input range type is DC voltage or DC current, the scaling of the PV
input can be set.
Item (Bank) Display Contents Initial value User level
PV range low limit
(Setup bank)
When the PV input range type is DC voltage
or DC current, the following contents apply:
-1999 to +9999 (no decimal point)
-199.9 to +999.9 (1 digit after decimal point)
-19.99 to +99.99 (2 digits after decimal point)
-1.999 to +9.999 (3 digits after decimal point)
When the PV input type is thermocouple or
RTD, the range low limit and high limit values
selected using the PV input range type are used.
0 Basic,
Standard,
High function
PV range high limit
(Setup bank)
1000
• When the PV input range type is thermocouple or RTD, the setting item can be
displayed, but the setting cannot be made.
• When the PV input range type is DC voltage or DC current, the display and
setting can be made.
The following describes the relationship between the PV input and PV when
setting up the range low limit and high limit:
PV
-10 0
100
110
Input (%)
Low limit
Low limit < High limit
Low limit > High limit
High limit
PV
-10 0
100
110
Input (%)
Low limit
High limit
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PV ratio and PV bias
The PV ratio and PV bias can be set to compensate the PV.
Item (Bank) Display Contents Initial value User level
PV ratio
(Parameter bank)
0.001 to 9.999 1.000 Standard,
High function
PV bias
(Parameter bank)
-1999 to +9999 U 0U Basic,
Standard,
High function
• Details of PV ratio and PV bias controls
Assuming that the control input is PVin, control result is PVout, PV ratio is RA,
and PV bias is BI, the following control formula is obtained:
PVout = (PVin × RA) + BI
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PV low limit alarm threshold
Item (Bank) Display Contents Initial value User level
PV input failure (under
range) type
0: -10 %FS
1: -5 mV
0 Simple,
Standard,
High function
If ROM version 1 in the instrument information bank (
i

d02
) is 2.26 or earlier, this
item cannot be displayed.
This setting is applicable if
C0

1
(PV input range type) is set for sensor type B (No.
17) or PR40-20 (No. 23).


PV low limit/high limit and PV low limit/high limit alarms (p.5-7)