Mitsubishi Electric FR-F700PJ Series, Instruction Manual

Page: 106 / 356

101
Limiting the output frequency
4
P
ARAM
ETE
R
S
4.5 Limiting the output frequency
4.5.1 Maximum/minimum frequency (Pr. 1, Pr. 2, Pr. 18)

The above parameters can be set when Pr. 160 Extended function display selection = "0". ( Refer to page 197)

Performing IPM parameter initialization changes the settings. (Refer to page 85)

Even if a value higher than the maximum motor frequency (Refer to page 86) is set in Pr. 18 under IPM motor control, the high speed maximum frequency is
limited to the maximum motor frequency
(2) Set minimum frequency
 Use Pr. 2 Minimum frequency to set the minimum frequency.
 If the set frequency is less than Pr. 2 , the output frequency is clamped at Pr. 2 (will not fall below Pr. 2 ).
Purpose Parameter that should be Set Refer to Page
Set upper limit and lower limit of
output frequency Maximum/minimum
frequency
Pr. 1, Pr. 2, Pr. 18
101
Perform operation by avoiding
mechanical resonance points
Frequency jump Pr. 31 to Pr. 36, Pr. 552
102
Motor speed can be limited.
Clamp the upper and lower limits of the output frequency.
Parameter
Number
Name Initial Value Setting Range Description
1 Maximum frequency
120Hz

0 to 120Hz Upper limit of the output frequency.
2 Minimum frequency
0Hz 0 to 120Hz Lower limit of the output frequency.
18

High speed maximum
frequency
120Hz

120 to 400Hz

Set when performing the operation at 120Hz
or more.
(1) Set maximum frequency
 Use Pr. 1 Maximum frequency to set the maximum frequency. If the
value of the frequency command entered is higher than the setting,
the output frequency is clamped at the maximum frequency.
 To operate with a frequency higher than 120Hz under V/F control or
General-purpose magnetic flux vector control, set the upper limit for
the output frequency in
Pr. 18 High speed maximum frequency .
(When Pr. 18 is set, Pr. 1 automatically switches to the frequency of
Pr. 18 . Also, when Pr. 1 is set, Pr. 18 is automatically changed to the
frequency set in Pr. 1 .)
REMARKS

To operate with a frequency higher than 60Hz (rated IPM motor frequency under IPM motor control (Refer to page 86) ) using
frequency-setting analog signals, change the Pr. 125 (Pr. 126) (frequency setting gain) setting. Changing only Pr.1 and Pr.18 does
not allow the operation with a frequency higher than 60Hz (rated IPM motor frequency under IPM motor control. (Refer to page 86)

Under IPM motor control, the estimated output frequency (rotations per minute) is used to limit the frequency. Therefore, a
value equal to or higher than the upper limit frequency may be displayed in the monitor.
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.

Under IPM motor control, the estimated output frequency (rotations per minute) is used to limit the frequency. Therefore, the
value displayed in the monitor may reach the lower limit frequency or lower.
CAUTION
Note that when
Pr. 2
is set to any value equal to or more than
Pr. 13 Starting frequency
, simply turning ON the start signal will
run the motor at the preset frequency according to the set acceleration time even if the command frequency is not input.
Parameters referred to
Pr. 13 Starting frequency Refer to page 116
Pr. 15
Jog frequency
Refer to page 108
Pr. 125 Terminal 2 frequency setting gain frequency, Pr. 126 Terminal 4 frequency setting gain frequency Refer to page 188
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)