Hitachi SJ100 Series Instruction Manual page 85

Second Acceleration and Deceleration Functions
The SJ100 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). These profile options are also available
for the second motor settings. Select a transition frequency method via A94 as depicted
below. Be careful not to confuse the second acceleration/deceleration settings with
settings for the second motor!
frequency
Accel 1
1
2CH
input
0
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).
"A" Function
Func.
Name
Code
A92 Second acceleration
time setting
A292 Second acceleration
time setting (2nd
motor)
A93 Second deceleration
time setting
A293 Second deceleration
time setting (2nd
motor)
A94 = 00
Accel 2
time
Description
Duration of 2nd segment of
acceleration, range is:
0.1 to 3000 sec.
Duration of 2nd segment of
acceleration, 2nd motor,
range is: 0.1 to 3000 sec.
Duration of 2nd segment of
deceleration, range is:
0.1 to 3000 sec.
Duration of 2nd segment of
deceleration, 2nd motor,
range is: 0.1 to 3000 sec.
SJ100 Inverter
frequency
A94 = 01
Accel 2
A95
Accel 1
0
frequency
Accel. curve
Target
freq.
Linear
S-curve
0
Acceleration period
Defaults
Run-
time
EU/
Units
Edit
US
✔
15.0 sec.
✔
15.0 sec.
✔
15.0 sec.
✔
15.0 sec.
3–19
Frequency
transition point
time
A97
time
DOP,DRW,DOP+
Func.
Name
Code
F-06 ACC2
F-06 2ACC2
F-07 DEC 2
F-07 2DEC 2