Hitachi WJ Series User Manual page 156

Chapter 9
■ (Example 1) Voltage input from [Ai1] (using a potentiometer), no [AT] terminal
Control circuit terminal block
H Ai1
Potentiometer (1 to 2 kΩ)
Frequency command (Hz)
Maximum
frequency
[Ai1] terminal 0 VDC
[Ai2] terminal 4 mA
■ (Example 2) Using the [AT] terminal to switch between [Ai1] voltage input and
Control circuit terminal block
H Ai1
 The default state is 0 to 10 VDC and 4 to 20 mA analog input to represent values from zero to the
maximum frequency (Hz).
 You can use the analog input start/end function to change the relationship between the analog input
value and the frequency command value. For details, refer to "9.15.3 Adjusting the Analog Input".
assignment
Ai2 L
10 VDC
Analog input
20 mA
[Ai2] current input
Ai2 L AT
+ -
 If the [AT] terminal is not assigned, [Ai1] + [Ai2] will act as the
frequency command.
 As shown in the figure to the left, when issuing a frequency
command consisting of a 0 to 10 VDC voltage input from the
[Ai1] terminal, short-circuit the [Ai2] terminal to the [L]
terminal to prevent it from being exposed to electrical noise.
(* When using current input from the [Ai2] terminal, be
sure to short-circuit the [Ai1] terminal to the [L]
terminal.)
 The default setting is 0 to 10 VDC and 4 to 20 mA analog
input to represent values from zero to the maximum frequency
(Hz). (Straight line on the graph shown on the left.)
 As represented by the dashed line on the graph shown on the
left, you can use the analog input start/end function to
change the relationship between the analog input value and
the frequency command value. For details, refer to "9.15.3
Adjusting the Analog Input".
 Connect a device such as an analog output module with a 0
to 10 VDC voltage input to [Ai1] or 4 to 20 mA current input
to [Ai2].
 Assign the [AT] input terminal to one of the input terminals
[1] to [7] and set the "[AT] selection [A005]" parameter to
"00".
[A005]
Any parameter from
[C001] to [C007]
[AT] terminal
9-2-5
Inverter Functions
00
16
OFF: [Ai1] voltage input
ON: [Ai2] current input