136
Speed setting by analog input (terminal 2, 4)
(3) 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 switch, the display units of C3 (Pr.
902), C4 (Pr. 903), C6 (Pr. 904), C7 (Pr. 905) change as shown below.
(1) Change the speed at maximum analog
input (Pr. 125, Pr. 126)
Set Pr. 125 (Pr. 126) when changing speed setting
(gain) of the maximum analog input voltage
(current) only. (C2 (Pr. 902) to C7 (Pr. 905) setting
need not be changed)
(2) Analog input bias/gain calibration
(C2 (Pr. 902) to C7 (Pr. 905))
The "bias" and "gain" functions are used to adjust
the relationship between the input signal entered
from outside the drive unit to set the rotation speed,
e.g. 0 to 5VDC, 0 to 10VDC or 4 to 20mADC, and
the rotation speed.
Set the bias speed of the terminal 2 input using C2
(Pr. 902).
(It is initially set to the speed at 0V)
Set the rotation speed in Pr. 125 for the speed
command voltage set with Pr. 73 Analog input
selection.
Set the bias speed of the terminal 4 input using
C5 (Pr.
904).
(It is
initially
set to the speed at 4mA)
Using Pr. 126, set the rotation speed relative to
20mA of the
speed
command current (4 to 20mA).
There are three methods to adjust the
speed
setting
voltage (current) bias/gain.
a) Method to adjust any point by application of a
voltage (current) across terminals 2 and 5 (4
and 5) page 138
b) Method to adjust any point without application of
a voltage (current) across terminals 2 and 5 (4
and 5) page 138
c) Method to adjust
speed
only without adjustment
of voltage (current) page 139
NOTE
When voltage/current input signal for terminal 4 was switched using Pr. 267 and voltage/current input switch, perform
calibration without fail.
Analog Command (terminal 2, 4)
(depending on Pr. 73, Pr. 267, and
voltage/current input switch)
Pr. 241 = 0 (initial value) Pr. 241 = 1
0 to 5V input 0 to 5V 0 to 100% (0.1%) display 0 to 100% 0 to 5V (0.01V) display
0 to 10V input 0 to 10V 0 to 100% (0.1%) display 0 to 100% 0 to 10V (0.01V) display
0 to 20mA input 0 to 20mA 0 to 100%(0.1%) display 0 to 100% 0 to 20mA (0.01mA) display
Parameters referred to
Pr. 73 Analog input selection, Pr.267 Terminal 4 input selection Refer to page 130
C2(Pr. 902)
C3(Pr. 902) C4(Pr. 903)
3000r/min
0
0
Speed setting signal
Rotation speed
100%
10V
Initial value
Bias
05V
Pr. 125
Gain
(r/min)
C5(Pr. 904)
Pr. 12
Initial value
Bias
Gain
3000r/min
0
Speed setting signal
100
0
20
4 20mA
01 5V
0 2 10V
C6(Pr.904) C7(Pr.905)
Rotation speed
(r/min)
