Hitachi NES1-002LB, Quick Reference Manual

Page: 92 / 295

Chapter 7 Explanation of Functions
7 - 17
7.4.3 Analog command holding function (AHD)
- The analog command holding function allows you to make the inverter hold the analog command input
via the external analog input terminal when the AHD terminal is on.
- While the AHD terminal is on, the up/down function can be used based on the analog signal held by this
function as reference data.
- When "01" is specified for Up/Down memory mode selection (C101), the result of up/down processing
can be stored in memory.
- If the inverter power is turned on or the RS terminal turned off with the AHD terminal left turned on, the
data held immediately before power-on or turning off the RS terminal will be used.
Item Function code Data Description
Terminal [1] to [5] functions C001 to C005 65 AHD: Analog command holding
7.4.4 Analog Input Adjustment
[C081/C082]
This function can change the gain of the analog input
.
Please use the fine adjustment of the analog input
signal. Please refer to “7.4.5” for the scale transformation.
Item Function code Range of data Description
O/OI input span calibration C081 0. to 200.0(%)
This function will fine-tune the gain for the input
voltage.
ON
AHD terminal
Input analog command
Frequency command
Note)
Set frequency remains when inverter
is switched with SET terminal with
AHD on. Turn AHD terminal off to
re-hold the set frequency.
Maximum frequency
10V, 20mA 5V, 10mA
200%
100%
50%
0
0V, 0mA
Frequency setting