Second acceleration and deceleration functions – Hitachi L100 User Manual
Page 75
L100 Inverter
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Second Acceleration and Deceleration Functions
The L100 inverter features two-stage acceleration and deceleration ramps. This gives
flexibility in the profile shape, and can avoid jerk (mechanical shock) while approaching
steady frequency (or stop) more gently. You can specify the frequency transition point,
the point at which the standard acceleration (F02) or deceleration (F03) changes to the
second acceleration (A92) or deceleration (A93). Select a transition frequency method
via A94 as depicted below.
Standard acceleration and deceleration is
linear. The inverter CPU can also calculate
an S-curve acceleration and deceleration
curve as shown. This profile avoids abrupt
changes in velocity, to reduce shock to the
motor load. The CPU fits the S-curve
acceleration or deceleration to a time
period you specify. It is also possible to
have a linear acceleration and an S-curve
deceleration, for example.
To enable the S-curve, use function A97 (acceleration) and A98 (deceleration).
Accel 1
time
A95
0
Accel 2
frequency
A94 = 00
1
0
2CH
input
A94 = 01
frequency
Accel 1
Accel 2
time
Frequency
transition point
0
frequency
Acceleration period
A97
time
S-curve
Linear
Accel. curve
Target
freq.
“A” Function
Run-
time
Edit
Defaults
DOP,DRW,DOP+
Func.
Code
Name
Description
EU/
US
Units
Func.
Code
Name
A92
Second acceleration
time setting
Duration of 2nd segment of
acceleration, range is:
0.1 to 3000 sec.
✔
15.0
sec.
F-06
ACC2
A93
Second deceleration
time setting
Duration of 2nd segment of
deceleration, range is:
0.1 to 3000 sec.
✔
15.0
sec.
F-07
DEC 2
A94
Select method to use
second accel/decel
Two options for switching
from 1st to 2nd accel/decel:
00... 2CH input from terminal
01... transition frequency
✘
00
—
F-06
ACC
CHG
A95
Acc1 to Acc2
frequency transition
point
Output frequency at which
Accel1 switches to Accel2,
range is 0.0 to 360.0 Hz
✘
0.0
Hz
F-06
ACC
CHFr
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