6
-22
Adjusting Frequency References
This section explains methods of adjusting frequency references.
Adjusting Analog Frequency References
Gain and bias are among the constants used to adjust analog inputs.
Related Constants
Adjusting Analog Frequency Reference Using Constants
The frequency reference can be input from the control circuit terminals using analog voltage and current sig-
nals.
If using terminal A1 as an input terminal for the frequency reference value, perform adjustments using con-
stants H3-01 to H3-03. If using multi-function analog input terminal A2 as a frequency reference terminal,
perform adjustments using H3-08 to H3-11. Set the analog input signal level using the constants H3-01 or
H3-08. Refer the following figures for setting the input gain and bias.
Fig 6.21 Terminals A1 and A2 Inputs
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Access
Level
H3-02
Frequency reference terminal A1
input gain
Sets the frequency as a percentage of the maximum output
frequency, when 10V is input.
0.0 to
1000.0
100.0%
Yes
A
H3-03
Frequency reference terminal A1
input bias
Sets the frequency as a percentage of the maximum output
frequency, when 0V is input.
-100.0
to
+100.0
0.0%
Yes
A
H3-08
Multi-function analog A2 signal
level selection
0: 0 to +10V (11 bit)
2: 4 to 20 mA (9-bit input)
3: 0 to 20 mA (9-bit input)
Switch current and voltage input using the switch S1 on
the control terminal board.
0, 2, 3
2
No
A
H3-09
Multi-function analog A2 func-
tion selection
Selects the multi-function analog input function for termi-
nal A2.
0 to 16
0
No
A
H3-10
Multi-function analog A2 input
gain
Sets the input levelwhen terminal A2 input is 10V (20mA)
according to the 100% value of the function set in constant
H3-09.
0.0 to
1000.0
100.0%
Yes
A
H3-11
Multi-function analog A2 input
bias
Sets the input level when terminal A2 input is 0V (4mA)
according to the 100% value of the function set in constant
H3-09.
-100.0
to
+100.0
0.0%
Yes
A
H3-12
Analog input filter time constant
Sets primary delay filter time constant for the two analog
input terminals (A1 and A2). Effective for noise control
etc.
0.00 to
2.00
0.00 s
No
A
H3-13
Terminal A1/A2 switching
0: Use terminal A1 analog input as main frequency refer-
ence.
1: Use terminal A2 analog input as main frequency refer-
ence.
Effective when H3-09 is set to 2.
0 or 1
0
No
A
Frequency reference
Terminal A1 input
Terminal A1
input voltage
Frequency reference
Terminal A2 input
Terminal A2 input
voltage (current)
0V (4 mA/0 mA)
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