Hitachi WJ C1 Series

Chapter 9 Inverter Functions
9-3-7
9.3.5 Making the Frequency Instantaneously Follow the Command
 How to output an analog command and have the frequency match it?
 How to make the motor follow the command with minimal delay?
 When the "Acceleration/Deceleration cancellation [LAC] (46)" input terminal turns on, the
acceleration/deceleration is canceled and the output frequency instantaneously responds to
changes in the frequency command value.
 Since the LAD cancellation function causes the output to instantaneously follow the command
value, a large increase or decrease may result in an over current trip, overload trip, or
overvoltage trip.
 The [LAC] terminal can be used for any frequency command, including commands based on
parameter settings or communication functions.
Code
Item
Description
Data
[C001]
to
[C007]
Input terminal
function
Acceleration/Deceleration cancellation [LAC]:
When this signal is turned on, the
acceleration/deceleration is canceled and the
output frequency follows the frequency command.
46
■ Example of the LAD cancellation function
[LAC]
Output frequency
Time
Analog frequency
command
ON
ON
Follows the
command
Follows the
acceleration/
deceleration
time
Output frequency
Follows the
acceleration/
deceleration time
Q
A
!