Hitachi WJ C1 Series User Manual

Chapter 9 Inverter Functions
9-2-20
Analog command holding function ([AHD] input terminal function)
 The analog command holding function holds the frequency command value of the analog input
when the "Analog command holding [AHD] (65)" input terminal turns on. The frequency
command value returns to the analog input command value once this terminal is turned off.
 While the [AHD] input terminal is on, the frequency command value can be increased or
decreased using the [FUP]/[FDN] function.
 When the "FUP/FDN data save enable [C101]" parameter is set to "Save (01)", the frequency
command value adjusted by the [FUP]/[FDN] function is saved in the inverter memory as an
"analog command holding frequency" when the power is shut off.
■ Analog command holding function operation diagram (when using [AHD] and
[UDC] with an analog frequency command)
 If power is turned on or the "Reset [RS] (18)" input terminal is from on to off while [AHD] is on,
the held data just before that point is used.
 If the system is switched between the first and second control by the "2nd-motor control [SET]"
input terminal while [AHD] is turned on, the held analog input remains as the frequency
command. To switch between first and second control, turn [AHD] off and then initiate the hold
again.
[AHD]
Analog input
Frequency
command
ON
ON
ON
Power
shut-off
Power
Power
on
ON
ON
[AHD]
[UDC]
Basic operation of the analog command
holding function
Operation of the analog command
holding function [UDC]
When [C101] is set to "Save", the hold
frequency command is saved in the inverter
memory when the power is shut off.
Analog input
and frequency
command
If [C104] is set to "Stored data", the
previous analog command holding
frequency is used as the frequency
command.
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A

Hitachi WJ C1 Series Specifications

General

Brand	Hitachi
Model	WJ C1 Series
Category	Inverter
Language	English