87
Limiting the output frequency
4
4.4 Limiting the output frequency
4.4.1
Maximum/minimum frequency (Pr. 1, Pr. 2, Pr. 18)
* The parameters can be set when
Pr. 160 User group read selection
= "0".
(Refer to page 192)
(2) Set minimum frequency
⋅
Use
Pr. 2 Minimum frequency
to set the lower limit of the output frequency.
⋅
The output frequency is clamped by the
Pr. 2
setting even the set frequency is lower than the
Pr. 2
setting (The
frequency will not decrease to the
Pr. 2
setting.)
Purpose
Parameter that must be Set
Refer to Page
Set upper limit and lower limit of
output frequency
Maximum/minimum
frequency
Pr. 1, Pr. 2, Pr. 18
Perform operation by avoiding
mechanical resonance points
Frequency jump
Pr. 31 to Pr. 36
You can limit the motor speed. Clamp the upper and lower limits of the output frequency.
Parameter
Number
Name
Initial Value
200V class (400V class)
Setting Range
Description
1
Maximum frequency
02330 (01160) or lower
120Hz
0 to 120Hz
Set the upper limit of the output
frequency.
03160 (01800) or higher
60Hz
2
Minimum frequency
0Hz
0 to 120Hz
Set the lower limit of the output
frequency.
18
*
High speed maximum
frequency
02330 (01160) or lower
120Hz
120 to 400Hz
Set when performing the
operation at 120Hz or more.
03160 (01800) or higher
60Hz
(1) Set maximum frequency
⋅
Set the upper limit of the output frequency in
Pr. 1 Maximum
frequency
. If the value of the frequency command entered is
higher than the setting, the output frequency is clamped at the
maximum frequency.
⋅
When you want to perform operation above 120Hz, set the upper
limit of the output frequency to
Pr. 18 High speed maximum
frequency
. (When
Pr. 18
is set,
Pr. 1
automatically switches to the
frequency of
Pr. 18
. When
Pr. 18
is set,
Pr. 18
automatically
switches to the frequency of
Pr. 1
.)
REMARKS
⋅
When performing operation above 60Hz using the frequency setting analog signal, change
Pr. 125 (Pr. 126) (frequency setting
gain)
. If only
Pr. 1
or
Pr. 18
is changed, operation above 60Hz cannot be performed
REMARKS
⋅
When
Pr. 15 Jog frequency
is equal to or less than
Pr. 2
, the
Pr. 15
setting has precedence over the
Pr. 2
setting.
⋅
When stall prevention is activated to decrease the output frequency, the output frequency may drop to
Pr. 2
or below.
CAUTION
If the
Pr. 2
setting is higher than the
Pr. 13 Starting frequency
value, note that the motor will run at the set
frequency according to the acceleration time setting by merely switching the start signal ON, without entry of the
command frequency.
♦
Parameters referred to
♦
Pr. 13 Starting frequency
Refer to page 104
Pr. 15 Jog frequency
Refer to page 95
Pr. 125 Terminal 2 frequency setting gain frequency, Pr. 126 Terminal 4 frequency setting gain frequency
Refer to page 179
Output frequency
(Hz)
Pr.1
Pr.18
Pr.2
Frequency setting
Clamped at the
maximum frequency
Clamped at the
minimum frequency
5, 10V
(20mA)
0
(4mA)
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