Hitachi L300P - Manual (Page 89)

“A” Group: Standard Functions
Configur
ing Dr
iv
e
P
a
ra
meters
3–20
Acceleration
Pause Function 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
“DC Braking
Settings” on page 3–17 .
“A” Function Run
Mode
Edit
Lo Hi
Defaults
Units SRW Display
Func.
Code
Name Description
–FE2
(CE)
–FU2
(UL)
–FR
(Jpn)
A063
A065
A067 Jump (center) frequency
setting 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
✘ ✔ 0.00 0.00 0.00
Hz >A063 JUMP
F1 0000.00Hz
>A065 JUMP
F2 0000.00Hz
>A067 JUMP
F3 0000.00Hz
A064
A066
A068 Jump (hysteresis)
frequency width setting Defines the distance from
the center frequency at
which the jump occurs
Range is 0.0 to 10.0 Hz ✘ ✔ 0.50 0.50 0.50 Hz >A064 JUMP
W1 00.50Hz
>A066 JUMP
W2 00.50Hz
>A068 JUMP
W3 00.50Hz
Accel pause
period
0
Output
frequency
A070
A069
Set frequency
t
“A” Function Run
Mode
Edit
Lo Hi
Defaults
Units SRW Display
Func.
Code
Name Description
–FE2
(CE)
–FU2
(UL)
–FR
(Jpn)
A069 Acceleration pause
frequency setting
Range is 0.00 to 400.0Hz ✘ ✔ 0.00 0.00 0.00 Hz >A069 F-STOP
F 0000.00H
A070 Acceleration pause time
setting
Range is 0.0 to 60.0 sec.
✘ ✔
0.0 0.0 0.0 sec. >A070 F-STOP
T 00.0s