Hitachi SJ Series User Manual page 209

Chapter 12
A
• You can use [AC115] to select one of the following
three methods of switching the acceleration or
deceleration time:
- Switching by the Input terminal function [2CH];
- Automatically switching by any given frequency;
and
- Automatically switching only at the time of
switching between the forward revolution and the
backward revolution.
• Described below is an exemplar case of switching
between the acceleration or deceleration time 1
and the acceleration or deceleration time 2.
(Example 1) In the case of setting [AC115] = 00
Output
frequency
Acceleration
time 1
(Example 3) In the case of setting [AC115] = 02
Forward-revolution
output frequency
Backward-revolution Acceleration
time 1
output frequency
Deceleration
Acceleration
time 2
time 2
Deceleration
time 1
Acceleration
Deceleration
time 2
time 1
Deceleration
time 2
!
• Set, as the acceleration time, the time that it takes
to rise from 0 Hz to the maximum frequency; and
set as the deceleration time, the time that it takes to
fall from the maximum frequency to 0 Hz. Each of
the set times is the corresponding one of the
following values.
Acceleration time 1: Calculated value from
[AC120];
Deceleration time 1: Calculated value from
[AC122];
Acceleration time 2: Calculated value from
[AC124]; and
Deceleration time 2: Calculated value from
[AC126].
(Example 2) In the case of setting [AC115] = 01
Output
frequency
Acceleration
time 1
12-8-4
Inverter Function
Acceleration
Deceleration Deceleration
time 2
time 2 time 1