Hitachi NES1-002LB, Quick Reference Manual

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Chapter 7 Explanation of Functions
7 - 26
7.5.7 Frequency upper limit setting
The frequency upper limit setting function allows you to place upper and lower limits on the inverter set
frequency.
This function restricts the input of frequency commands that specify any frequencies outside the upper and
lower limits.
When use PID function, limits the PID-output.
Always set the upper limit before setting the lower limit. Also, be sure to keep the frequency upper limit
(A061/A261) larger than the frequency lower limit (A062/A262).
Be sure that upper limit/lower limit does not exceed Maximum frequency (A004/A204).
Be sure to set output frequency (F001) and multiple speed 1 to 7(A021 to A027) in between uppelimit and
lower limit.
If 0 Hz is set for the frequency upper and lower limits, they will not operate.
Item Function code Range of data Description
Frequency upper
limit setting
A061/A261
0.00 or a frequency more than the
frequency lower limit setting up to the
maximum frequency (Hz)
Setting of the upper limit of the
set frequency
Frequency lower
limit setting
A062/A262
0.00 or a frequency not less than the
starting frequency up to the frequency
upper limit setting (Hz)
Setting of the lower limit of the
set frequency
When the O/OI-L terminal is used:
7.5.8 Jump frequency function
The jump frequency function allows you to operate the inverter so that it avoids the resonant frequency of
the machine driven by the same.
Since the inverter avoids the motor operation with a constant output frequency within the specified range
of the frequencies to jump when the jump frequency function is enabled, you cannot set any inverter output
frequency within the specified range of the frequencies to jump.
Note that, while the inverter is accelerating or decelerating the motor, the inverter output frequency
changes continuously according to the set acceleration/deceleration time.
You can set up to three frequencies to jump.
Item Function code Range of data Description
Jump (center) frequency
settings, 1st/2nd/3rd settings A063/A065/
A067
0.00 to 400.0 (Hz) (*1)
Setting of the center frequency of the
frequency range to be jumped
Jump (hysteresis) frequency
width settings, 1st/2nd/3rd
settings
A064/A066/
A068
0.00 to 10.00(Hz)
Setting of the half bandwidth of the
frequency range to be jumped
*1 Setting of 0 Hz disables the jump frequency function.
Output frequency (Hz)
Frequency command
0 V
0 mA
10 V
20 mA
Maximum frequency
A004/A204
If 0 V or 0 mA is input as the frequency command,
the inverter will output the frequency lower limit
setting (A062).
A063
A065
A067
A064
A064
A066
A066
A068
A068
Output frequency
Frequency command
A062
A061