Control block diagram (Speed limit mode 1)
as speed command input
Parameter (Pr. 808, Pr. 809)
Using the speed command during speed control (Pr. 1113 = "9999", Pr. 807 = "0").
● Speed limit is set by the same method as speed setting during speed control. (Speed setting by
PU (operation panel / parameter unit), multi-speed setting, plug-in option, etc.)
● At turn-ON of the start signal, the speed limit is raised from 0 Hz in accordance with the Pr. 7
"Acceleration time". At turn-OFF of the start signal, the speed limit is lowered from the speed at
that point to the Pr. 10 "DC injection brake operation frequency" in accordance with the Pr. 8
"Deceleration time". Then the motor is stopped.
The second and third acceleration/deceleration time can be set.
When the speed limit command is larger than the Pr. 1 "Maximum frequency" setting value, speed
limit value becomes the Pr. 1 setting value. When the speed limit command is smaller than Pr. 2
"Minimum frequency" setting value, speed limit value becomes the Pr. 2 setting value. Also when
the speed limit command is smaller than the Pr. 13 "Starting frequency", the speed limit value
becomes 0 Hz.
To perform speed limit by analog input, calibrate analog input terminals 1, 2 and 4. (Refer to page
To use analog inputs to perform speed control, turn the external signals (RH, RM, RL) OFF. If any of
the external signals (RH, RM, RL) is ON, speed limit by multi-speed is enabled.
Torque control under Real sensorless vector control and vector control
Pr. 807 Speed limit selection
Control block diagram
Use the speed command for speed control
Speed estimated value < speed limit value
Speed estimated value
speed limit value
Real sensorless vector control
The speed setting value is
a speed limit value.
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