87
Limiting the rotation speed
4.6 Limiting the rotation speed
4.6.1
Maximum/minimum setting (Pr. 1, Pr. 2)
The value left of the slash is for the 2.2K drive unit or lower. The one right of the slash is for the 3.7K drive unit.
If a value exceeding the upper speed limit of the motor is set, the actual operation will be limited at the maximum rotation speed. The setting range is for the
S-PM motor. The maximum setting value differs depending on the number of poles of the applied motor.
(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
Perform operation by avoiding
mechanical resonance points
Speed jump
Pr. 31 to Pr. 36
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
Upper limit of the output speed.
2
Minimum setting
0r/min
0 to 3600r/min /
0 to 2400r/min
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.
The speed command is also clamped at the operable speed range
of the selected motor.
If the motor's operable maximum speed < maximum setting, the
speed does not increase to 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
Pr. 15
Jog speed setting
Pr. 125 Terminal 2 speed setting gain speed, Pr. 126 Terminal 4 speed setting gain speed
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)
Summary of Contents for FR-D720-0.2K-G
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