SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
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Chapter 4 Explanation of Functions<br />
4.2.20 Frequency upper limit setting<br />
The frequency upper limit setting function allows you to place<br />
upper and lower limits on the inverter output frequency.<br />
This function restricts the input of frequency commands that<br />
specify any frequencies outside the upper and lower limits.<br />
Always set the upper limit before setting the lower limit. Also, be sure to keep the frequency upper limit<br />
(A061/A261) larger than the frequency lower limit (A062/A262).<br />
Be sure that upper limit/lower limit does not exceed Maximum frequency (A004/A204/A304).<br />
Be sure to set output frequency (F001) and multiple speed 1 to 15 (A021 to A035) in between uppelimit<br />
and lower limit.<br />
If 0 Hz is set for the frequency upper and lower limits, they will not operate.<br />
The frequency limit setting function is disabled when the 3rd control system is selected.<br />
Item Function code Range of data Description<br />
0.00 or a frequency more than the<br />
A061/A261 frequency lower limit setting up to the<br />
maximum frequency (Hz)<br />
Frequency upper<br />
limit setting<br />
Frequency lower<br />
limit setting<br />
A062/A262<br />
0.00 or a frequency not less than the<br />
starting frequency up to the frequency<br />
upper limit setting (Hz)<br />
Related code<br />
A061/A261: /Frequency upper limit setting,<br />
1st/2nd motors<br />
A062/A262: Frequency lower limit setting,<br />
1st/2nd motors<br />
Setting of the upper limit of the<br />
output frequency<br />
Setting of the lower limit of the<br />
output frequency<br />
(1) When the O-L or OI-L terminal is used:<br />
Output frequency (Hz)<br />
Maximum frequency<br />
A004/A204<br />
A061<br />
If 0 V or 4 mA is input as the frequency command<br />
when a frequency lower limit has been set for the<br />
frequency lower limit setting (A062), the inverter<br />
will output the set frequency.<br />
A062<br />
0 V<br />
4 mA<br />
(2) When the O2-L terminal is used:<br />
Maximum frequency<br />
A004/A204<br />
A061<br />
10 V<br />
20 mA<br />
Frequency command<br />
Reverse rotation<br />
-10 V<br />
A062<br />
Forward rotation<br />
A062<br />
10 V<br />
A061<br />
Maximum frequency<br />
A004/A204<br />
If the frequency lower limit is used with the frequency command input via the O2-L terminal, the motor<br />
speed with 0 V input will be fixed to the frequency setting of the frequency lower limit (A062) for forward<br />
rotation or the frequency setting of the frequency lower limit (A062) for reverse rotation as shown below.<br />
(a) When operation commands are input via the control circuit terminal block (A002: 01)<br />
Terminal Motor speed with 0 V input via O2 terminal<br />
FW(ON) Frequency setting by A062 for forward rotation<br />
RV(ON) Frequency setting by A062 for reverse rotation<br />
(b) When operation commands are input from the digital operator (A002: 02)<br />
F004 Motor speed with 0 V input via O2 terminal<br />
00 Frequency setting by A062 for forward rotation<br />
01 Frequency setting by A062 for reverse rotation<br />
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