Acceleration Pause Function - Hitachi SJ300 Series Instruction Manual

"A" Function
Func.
Name
Code
A063 Jump (center) frequency
A065 setting
A067
A064 Jump (hysteresis)
A066 frequency width setting
A068
Acceleration
Pause Function
"A" Function
Func.
Name
Code
A069 Acceleration pause
frequency setting
A070 Acceleration pause time
setting
Description
Up to 3 output frequencies
can be defined for the output
to jump past to avoid motor
resonances (center
frequency)
Range is 0.00 to 400.0 Hz
Defines the distance from
the center frequency at
which the jump occurs
Range is 0.0 to 10.0 Hz
The acceleration pause function can be
used to minimize the occurrence of
over-current trips when accelerating
high inertia loads. It introduces a dwell
or pause in the acceleration ramp. You
can control the frequency at which this
dwell occurs (A069), and the duration
of the pause time (A070). This function
can also be used as an anti-windmilling
tool, when the load might have a
tendency to drive the motor in a reverse
direction while the inverter is in a Stop mode. Initiating a normal acceleration in such a situa-
tion may result in over-current trips. This function can be used to keep the inverter output
frequency and voltage at low levels long enough to bring the load to a stop, and commence
turning in the desired direction before the acceleration ramp resumes. See also
Settings" on page 3–18.
Description
Range is 0.00 to 400.0Hz
Range is 0.0 to 60.0 sec.
Defaults
Run
Mode
Edit
–FE –FU –FR
Lo Hi
(EU) (US) (JP)
✘ ✔
0.00 0.00 0.00
✘ ✔
0.50 0.50 0.50
Output
frequency
Accel pause
period
A069
0
A070
Defaults
Run
Mode
Edit
–FE –FU –FR
Lo Hi
(EU) (US) (JP)
✘ ✔
0.00 0.00 0.00
✘ ✔
0.0 0.0 0.0
3–21
SJ300 Inverter
SRW Display
Units
Hz >A063 JUMP
F1 0000.00Hz
>A065 JUMP
F2 0000.00Hz
>A067 JUMP
F3 0000.00Hz
Hz >A064 JUMP
W1 00.50Hz
>A066 JUMP
W2 00.50Hz
>A068 JUMP
W3 00.50Hz
Set frequency
t
"DC Braking
SRW Display
Units
Hz >A069 F-STOP
F 0000.00H
sec. >A070 F-STOP
T 00.0s