Hitachi L100 Instruction Manual page 75

Second Acceleration and Deceleration Functions
Func.
Code
A92
A93
A94
A95
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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.
frequency
A94 = 00
Accel 2
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
Name
Second acceleration Duration of 2nd segment of
time setting acceleration, range is:
0.1 to 3000 sec.
Second deceleration Duration of 2nd segment of
time setting deceleration, range is:
0.1 to 3000 sec.
Select method to use Two options for switching
second accel/decel from 1st to 2nd accel/decel:
00... 2CH input from terminal
01... transition frequency
Acc1 to Acc2 Output frequency at which
frequency transition Accel1 switches to Accel2,
point range is 0.0 to 360.0 Hz
frequency
A95
time
0
frequency
Target
freq.
Linear
0
Acceleration period
Run-
time
Description
Edit
3–19
L100 Inverter
A94 = 01
Accel 2
Frequency
transition point
Accel 1
time
Accel. curve
A97
S-curve
time
Defaults DOP,DRW,DOP+
EU/ Func.
Units Name
US Code
15.0 sec. F-06 ACC2
15.0 sec. F-07 DEC 2
00 — F-06 ACC
CHG
0.0 Hz F-06 ACC
CHFr