Hitachi SJ7002 Series Instruction Manual page 199

4–38
Using Intelligent Input Terminals
General Purpose
Inputs 1–8
56=[MI1]
57=[MI2]
58=[MI3]
Opt. Code
59=[MI4]
and
60=[MI5]
Symbol
61=[MI6]
62=[MI7]
63=[MI8]
Valid for
[1] to [8]
Inputs
Required See Easy
Sequence
Settings
Default
Requires
config.
terminal
Analog Holding
Command
65
Opt. Code
[AHD]
Symbol
Valid for
[1] to [8]
Inputs
Required
C101
Settings
Default Requires
config.
terminal
Clearwater Tech - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.clrwtr.com - Email: info@clrwtr.com
Refer to the Easy Sequence Instruction Manual for information on how to configure and use the
general purpose inputs MI1 to MI8.
The analog holding function causes the inverter to sample and hold the analog command
(external analog input). The hold operation begins when the intelligent input [AHD] (assign
option code 65) turns ON. While [AHD] terminal is ON, the Up/Down function uses the held
input level as the reference speed (frequency) value. Set parameter C101 (Up/Down memory
Mode Selection) = 01 to store the last frequency adjusted by UP/DWN in memory.
If the inverter power is cycled (OFF and ON) or the [RS] reset terminal receives a reset (ON
and OFF) while [AHD] is ON (holding analog value), the data held at the moment of power
OFF or Reset ON will be used.
The wave form below shows a typical sequence for use of the Analog Holding Command.
Analog input command
Output frequency command
Analog Holding Command [AHD]
NOTE: Frequent use of the Analog Hold function may damage the corresponding flash
memory register in the inverter.
0
0
1
Analog hold ON
0
t