230
Special operation and frequency control
(11) Bias and gain for PID displayed values(
C42(Pr. 934) to C45(Pr. 935)
)
When both of
C42(Pr.934)
and
C44(Pr.935)
z
"9999", bias/gain calibration is available for analog value of set point,
measured value, deviation value to perform PID control.
1) Bias/gain calibration for PID displayed value(
C42(Pr. 934) to C45(Pr. 935)
)
"Bias" / "gain" function can adjust the relation between PID displayed coefficient and measured value input
signal. Examples of measured value input signals are 0 to 5VDC, 0 to 10VDC, or 4 to 20mADC, and they are
externally input.
Set PID display bias coefficient for terminal 4 input with
C42(Pr.934)
.
(Initial value is the coefficient for 4mA.)
Set PID display gain coefficient for 20mA of the frequency command current (4 to 20mA) with
C44(Pr.935)
.
When both of
C42(Pr.934)
and
C44(Pr.935)
z
"9999" and
Pr.133
is set as the set point, the setting of
C42(Pr.934)
is treated as 0%, and
C44(Pr.935)
as 100%.
Three methods of bias/gain adjustment for PID displayed values are the following.
(a)Method to adjust any point by application of voltage (current) across the terminals 4 and 5.
(b)Method to adjust any point without application of voltage (current) across terminals 4 and 5.
(c)Method to adjust only the frequency without adjusting the voltage (current).
(For the detail of (a) to (c),
refer to page 162
.
Make adjustment by assuming
C7 (Pr.905)
as
C45 (Pr.935)
, and
Pr.126
as
C44 (Pr.935)
.)
2) Analog input display unit changing
(Pr. 241)
You can change the analog input display unit (%/V, mA) for analog input bias/gain calibration.
Depending on the terminal input specification set to
Pr. 73
,
Pr. 267
, and voltage/current input switch the display
units of
C3(Pr. 902), C4(Pr. 903), C43(Pr. 934), C45(Pr. 935)
change as shown below.
CAUTION
When the voltage/current input specifications are changed with voltage/current input switch and using
Pr. 73
and
Pr. 267
, be sure
to make calibration.
Analog Command (Terminal 4)
(according to
Pr. 73, Pr. 267
, and Voltage/Current
Input Switch)
Pr. 241
= 0 (Initial Value)
Pr. 241
= 1
0 to 5V input
0 to 5V
o
displayed in 0 to 100%(0.1%).
0 to 100%
o
displayed in 0 to 5V(0.01V).
0 to 10V input
0 to 10V
o
displayed in 0 to 100%(0.1%).
0 to 100%
o
displayed in 0 to 10V(0.01V).
4 to 20mA input
0 to 20mA
o
displayed in 0 to 100%(0.1%).
0 to 100%
o
displayed in 0 to 20mA(0.01mA).
i
Parameters referred to
i
Pr. 59 Remote function selection
Refer to page 87
Pr. 73 Analog input selection
Refer to page 155
Pr. 79 Operation mode selection
Refer to page 175
Pr. 178 to Pr. 189 (input terminal function selection)
Refer to page 110
Pr. 190 to Pr. 196 (output terminal function selection)
Refer to page 116
C2 (Pr. 902) to C7 (Pr. 905) Frequency setting voltage (current) bias/gain
Refer to page 162
100
0
Frequency setting signal
100%
Initial value
Bias
C42(Pr.934)
Gain
C44(Pr.935)
0
20
4
20mA
Coef
ficient
C43(Pr.934)
C45(Pr.935)
Summary of Contents for F700
Page 327: ...318 MEMO ...
Page 340: ...331 MEMO ...
