Hitachi SJ7002 Series Instruction Manual page 104

Func.
Code
A063
A065
A067
A064
A066
A068
Acceleration
Pause Function
Func.
Code
A069
A070
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Jump Frequencies – Some motors or machines exhibit resonances at particular speed(s),
which can be destructive for prolonged running at those speeds. The inverter has up to three
jump frequencies as shown in the graph. The hysteresis around the jump frequencies causes the
inverter output to skip around the sensitive frequency values.
Output
frequency
A067
A065
A063
Name/
Description
Jump (center) frequency setting
Up to three output frequencies can be defined for the output to jump past to
avoid motor resonances (center frequency)
Jump (hysteresis) frequency width
setting
Defines the distance from the center frequency at which the jump occurs
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.
Name/
Description
Acceleration pause frequency setting 0.00 to 400.0 (Hz);
Acceleration pause time setting
Jump frequencies
A064
A064
Range and Settings
0.00 to 400.0 (Hz);
model -4000HFx2 is 0.00 to 120.0 (Hz)
Range is 0.0 to 10.0 Hz
Output
frequency
A069
0
Range and Settings
model -4000HFx2 is 0.00 to 120.0 (Hz)
0.0 to 60.0 (seconds)
SJ700 Inverter
2
A068
A068
A066
Hysteresis values
A066
Frequency command
Defaults
FEF2 FUF2 FF2
FE2 FU2 F2
(EU) (USA) (Jpn)
0.00 0.00 0.00
0.50 0.50 0.50
Set frequency
Accel pause
period
A070
"DC Braking
Defaults
FEF2 FUF2 FF2
FE2 FU2 F2
(EU) (USA) (Jpn)
0.00 0.00 0.00
0.0 0.0 0.0
3–21
Run
Mode
Edit
Lo Hi
✘ ✔
✘ ✔
✘ ✔
✘ ✔
t
Run
Mode
Edit
Lo Hi
✘ ✔
✘ ✔