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Chapter 4
4.2.20 Frequency upper limit setting
The frequency upper limit setting function allows you to place upper and
lower limits on the inverter output frequency.
This function restricts the input of frequency commands that specify any
frequencies outside the upper and lower limits.
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/A304).
Be sure to set output frequency (F001) and multiple speed 1 to 15 (A021 to A035) in between uppelimit and lower
limit.
If 0 Hz is set for the frequency upper and lower limits, they will not operate.
The frequency limit setting function is disabled when the 3rd control system is selected.
Item
Function code
Frequency upper
limit setting
Frequency lower limit
setting
(1) When the O-L or OI-L terminal is used:
Output frequency (Hz)
Maximum frequency
A004/A204
(2) When the O2-L terminal is used:
Maximum frequency
A004/A204
Reverse rotation
If the frequency lower limit is used with the frequency command input via the O2-L terminal, the motor speed with 0 V
input will be fixed to the frequency setting of the frequency lower limit (A062) for forward rotation or the frequency
setting of the frequency lower limit (A062) for reverse rotation as shown below.
(a) When operation commands are input via the control circuit terminal block (A002: 01)
Terminal
Motor speed with 0 V input via O2 terminal
FW(ON)
Frequency setting by A062 for forward rotation
RV(ON)
Frequency setting by A062 for reverse rotation
(b) When operation commands are input from the digital operator (A002: 02)
F004
Motor speed with 0 V input via O2 terminal
00
Frequency setting by A062 for forward rotation
01
Frequency setting by A062 for reverse rotation
0.00 or a frequency more than the
A061/A261
frequency lower limit setting up to the
maximum frequency (Hz)
0.00 or a frequency not less than the
A062/A262
starting frequency up to the frequency
upper limit setting (Hz)
A061
A062
0 V
10 V
4 mA
20 mA
A061
A062
-10 V
A062
A061
Maximum frequency
A004/A204
Explanation of Functions
A061/A261: /Frequency upper limit setting,
A062/A262: Frequency lower limit setting,
Range of data
If 0 V or 4 mA is input as the frequency command
when a frequency lower limit has been set for the
frequency lower limit setting (A062), the inverter will
output the set frequency.
Frequency command
Forward rotation
10 V
4-24
Related code
1st/2nd motors
1st/2nd motors
Description
Setting of the upper limit of the
output frequency
Setting of the lower limit of the
output frequency
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