78
Limiting the rotation speed
4.5 Limiting the rotation speed
4.5.1 Maximum/minimum setting (Pr. 1, Pr. 2)
∗1 Differs according to capacities. (0.2K to 2.2K/3.7K)
∗2 If a value exceeding 3000r/min is set, the actual rotation speed will be limited at 3000r/min.
(2) Set minimum speed
Use Pr. 2 Minimum setting to set the minimum rotation speed.
If the set speed is less than Pr. 2, the rotation speed 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
rotation speed
Maximum/minimum
setting
Pr. 1, Pr. 2
78
Perform operation by avoiding
mechanical resonance points
Speed jump Pr. 31 to Pr. 36
79
Motor speed can be limited.
Clamp the upper and lower limits of the rotation speed.
Parameter
Number
Name Initial Value Setting Range Description
1 Maximum setting
3000r/min
0 to 12000r/min/
0 to 8000r/min
∗1∗2
Upper limit of the output speed.
2 Minimum setting
0r/min
0 to 3600r/min/
0 to 2400r/min
∗1∗2
Lower limit of the output speed.
(1) Set maximum speed
Use Pr. 1 Maximum setting to set the maximum rotation speed. If the
value of the speed command entered is higher than the setting, the
rotation speed is clamped at the maximum speed.
REMARKS
Because the speed is limited by the speed command, the upper limit value or a higher value may be displayed on the monitor.
REMARKS
When Pr. 15 Jog speed setting 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 rotation speed, the rotation speed may drop to Pr. 2 or below.
Because the speed is limited by the speed command, the lower limit value or a lower value may be displayed on the monitor.
CAUTION
Note that when Pr. 2 is set to any value equal to or more than Pr. 13 Starting speed, simply turning ON the start
signal will run the motor at the preset speed according to the set acceleration time even if the command speed
is not input.
Parameters referred to
Pr. 13 Starting speed Refer to page 89
Pr. 15
Jog speed setting Refer to page 82
Pr. 125 Terminal 2 speed setting gain speed, Pr. 126 Terminal 4 speed setting gain speed
Refer to page 135
Rotation speed
(r/min)
Pr. 1
Pr. 2
Speed setting
Clamped at the
maximum setting
Clamped at the
minimum setting
5, 10V
(20mA)
0
(4mA)
