Hitachi SJ Series, User Manual

Page: 206 / 786

12-8-1
Chapter 12 Inverter Function
12.8 Use function of accelerating or
decelerating motor speed
12.8.1 Change acceleration time and
deceleration time
• To speed up the acceleration of the motor to make
it more responsive.
• To extend the acceleration time for the purpose of
preventing over current.
• To extend the deceleration time for the purpose of
preventing over voltage.
• To slow down the acceleration or deceleration of
the motor that has a large load inertia.
• Set up the acceleration time and the deceleration
time of the motor. Set a longer time for slower
acceleration or deceleration; set a shorter time for
faster acceleration or deceleration.
• Set, as the acceleration time, the time that it takes
to rise from 0 Hz to the maximum frequency; set as
the deceleration time, the time that it takes to fall
from the maximum frequency to 0 Hz.
• In the initial state, the acceleration time 1 [AC120]
and the deceleration time 1 [AC122] are enabled.
• The currently enabled acceleration time and
deceleration time can be monitored with [FA-10]
and [FA-12], respectively; In the initial state,
[FA-10] = [AC120] acceleration time 1 and [FA-12]
= [AC122] deceleration time 1
• When the function of acceleration or deceleration
action cancellation 071 [LAC] is selected as the
Input terminal function and the signal is turned ON,
the set acceleration or deceleration time will
become re-set at 0 s and the output frequency will
be made instantaneously to follow the frequency
command.
• The target of command for the acceleration or
deceleration time can be selected with [AC-01].
- Employ the internally-set acceleration or
deceleration time.
- Employ the acceleration or deceleration time of
the program function EzSQ.
• The acceleration or deceleration time may be
changed in response to the command given by the
multi-speed function. For details, see Chap.
12.4.10: Switching the frequency in multiple
speeds.
Parameter
Item Parameter Data Description
Maximum frequency
For IM, [Hb105] For SM
(PMM), [Hd105]
10.00~590.00(Hz) Set the maximum value for the frequency.
Acceleration time 1 [AC120] 0.00~3600.00(s)
Set, as the acceleration time, the time
that it takes to rise from 0 Hz to the
maximum frequency.
Deceleration time 1 [AC122] 0.00~3600.00(s)
Set, as the deceleration time, the time
that it takes to fall from the maximum
frequency to 0 Hz.
Acceleration or
deceleration input
type
[AC-01] 00~04
00: Parameter set-up
04: Program function EzSQ
Input terminal
selection
[CA-01]~[CA-11] 071
Acceleration or deceleration cancellation
function [LAC]
OFF: Function disabled.
ON: Ignore the acceleration or
deceleration time, and follow the
command.
Acceleration time
(M Setting)
[FA-10] 0.00~3600.00(s)
Display the currently-enabled
acceleration time.
Deceleration time
(M Setting)
[FA-12] 0.00~3600.00(s)
Display the currently-enabled
deceleration time.
Q
A
!