Limit The Output Frequency; Maximum And Minimum Frequency (Pr. 1, Pr. 2, Pr. 18) - Mitsubishi Electric FR-F740 EC Instruction Manual

Limit the output frequency

6.3 Limit the output frequency
Purpose
Set upper limit and lower limit of output
frequency
Perform operation by avoiding machine
resonance points
6.3.1

Maximum and minimum frequency (Pr. 1, Pr. 2, Pr. 18)

You can limit the motor speed. Clamp the upper and lower limits of the output frequency.
Pr.
Name
No.
1
Maximum frequency
2
Minimum frequency
High speed maximum
18
frequency
The above parameter can be set when Pr. 160 = 0.
Set the maximum frequency
Set the upper limit of the output frequency in Pr. 1 "Maximum frequency". If the frequency 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.)
frequency [Hz]
Pr. 1
Pr. 18
Clamped at the
minimum frequency
NOTE When performing operation above 60Hz using the frequency setting analog signal, change
Pr. 125 (Pr. 126) "Frequency setting gain". (Refer to section 6.15.4.) If only Pr. 1 or Pr. 18 is
changed, operation above 60Hz cannot be performed.
6 - 54
Setting
Initial Value
Range
01160
120Hz
or less
0–120Hz
01800
60Hz
or more
0Hz 0–120Hz
01160
120Hz
or less
120–400Hz
01800
60Hz
or more
Output
Pr. 2
0 5, 10V
(4mA) (20mA)
Parameters that must be set
Maximum/minimum frequency
Frequency jump
Description
Set the upper limit of the output
frequency.
Set the lower limit of the output
frequency.
Set when performing the opera-
tion at 120Hz or more
Fig. 6-10:
Clamped at the
Maximum and minimum output frequency
maximum frequency
Frequency
setting
Parameter
Refer to
Section
Pr. 1, Pr. 2, 6.3.1
Pr. 18
Pr. 31–Pr. 36 6.3.2
Refer to
Parameters referred to
Section
13 Starting frequency 6.6.2
15 Jog frequency 6.5.2
125 Terminal 2 6.15.4
frequency setting
gain frequency
126 Terminal 4 6.15.4
frequency setting
gain frequency
I001100E