Mitsubishi Electric FR-A700 EC, Instruction Manual

Page: 348 / 826

Limit the output frequency Parameter
6 - 168
6.8 Limit the output frequency
6.8.1 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.
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.)
Purpose Parameters that must be set
Refer to
Section
Set upper limit and lower limit of output
frequency Maximum/minimum frequency Pr. 1, Pr. 2,
Pr. 18 6.8.1
Perform operation by avoiding machine
resonance points Frequency jump Pr. 31–Pr. 46 6.8.2
Pr.
No.
Name Initial Value
Setting
Range
Description Parameters referred to
Refer to
Section
1
Maximum frequency
01800
or less
120Hz
0–120Hz
Set the upper limit of the output
frequency.
13
15
125
126
Starting frequency
Jog frequency
Terminal 2
frequency setting
gain frequency
Terminal 4
frequency setting
gain frequency 6.11.2
6.10.2
6.20.5
6.20.5
02160
or more
60Hz
2
Minimum frequency 0Hz 0–120Hz
Set the lower limit of the output
frequency.
18
High speed maximum
frequency
01800
or less
120Hz
120–400Hz
Set when performing the opera-
tion at 120Hz or more
02160
or more
60Hz
Fig. 6-56:
Maximum und minimum output frequency
I001100E
NOTE When performing operation above 50Hz using the frequency setting analog signal, change
Pr. 125 (Pr. 126) "Frequency setting gain". (Refer to section 6.20.5.) If only Pr. 1 or Pr. 18 is
changed, operation above 50Hz cannot be performed.
Pr. 1
Pr. 18
Clamped at the
maximum frequency
5, 10V
(20mA)
Output
frequency [Hz]
Pr. 2
Frequency
setting
0
(4mA)
Clamped at the
minimum frequency