Hitachi WJ200 Series

3−37
Second Acceleration and Deceleration Functions
The WJ200 inverter features two-stage acceleration and deceleration ramps. This gives
flexibility in the profile shape. You can specify the frequency transition point, the point
at which the standard acceleration (F002) or deceleration (F003) changes to the second
acceleration (a092) or deceleration (a093). Or, you can use intelligent input [2CH] to
trigger this transition. These profile options are also available for the second motor
settings. Select a transition method via a094 as depicted below. Be careful not to confuse
the
second acceleration/deceleration settings with settings for the second motor !
“A” Function
Run
Mode
Edit
Defaults
Func.
Code
Name Description Lnitial data Units
A092
Acceleration time (2) Duration of 2
nd
segment of
acceleration, range is:
0.01 to 3600 sec.

10.00 sec
A292
Acceleration time (2),
2
nd
motor

10.00 sec
A093
Deceleration time (2) Duration of 2
nd
segment of
deceleration, range is:
0.01 to 3600 sec.

10.00 sec
A293
Deceleration time (2),
2
nd
motor

10.00 sec
A094
Select method to switch to
Acc2/Dec2 profile
Three options for switching
from 1st to 2nd accel/decel:
00…2CH input from terminal
01…Transition frequency
02…Forward and reverse
U
00
−
A294
Select method to switch to
Acc2/Dec2 profile, 2
nd
motor
U
00
−
A095
Acc1 to Acc2 frequency
transition point
Output frequency at which
Accel1 switches to Accel2,
range is 0.0 to 400.0 Hz
U
0.0 Hz
A295
Acc1 to Acc2 frequency
transition point, 2
nd
motor
U
0.0 Hz
A096
Dec1 to Dec2 frequency
transition point
Output frequency at which
Decel1 switches to Decel2,
range is 0.0 to 400.0 Hz
U
0.0 Hz
A296
Dec1 to Dec2 frequency
transition point, 2
nd
motor
U
0.0 Hz
NOTE: For A095 and A096 (and for 2nd motor settings), if you set a very rapid Acc1 or
Dec1 time (less than 1.0 second), the inverter may not be able to change rates to Acc2 or
Dec2 before reaching the target frequency. In that case, the inverter decreases the rate
of Acc1 or Dec1 in order to achieve the second ramp to the target frequency.
a094 = 00
Transition via 2CH input
Output
frequency
A
ccel 1
A
ccel 2
2CH
input
1
0
t
t
0
a094 = 01
Transition via freq. level
Output
frequency
A
ccel 1
A
ccel 2
t
0
a095
Frequency
transition point