Mitsubishi Electric FR-A820-00046 Instruction Manual page 345

Parameters
Control block diagram (Speed limit mode 1)
as speed command input
Parameter (Pr. 808, Pr. 809)
Forward/reverse rotation
Fig. 5-48:
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.
Fig. 5-49:
NOTES 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
5-418.)
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.
FR-A800
Torque control under Real sensorless vector control and vector control
Torque command
Pr. 807 Speed limit selection
0
Same method
1
+
2
speed limit
-
Control block diagram
Speed
Forward rotation
Pr. 7
Speed setting
value during
speed control
Reverse rotation
STF (STR)
ON
Use the speed command for speed control
Speed estimated value < speed limit value
Speed control
(proportional control)
Speed estimated value speed limit value
Real sensorless vector control
Vector control
The speed setting value is
a speed limit value.
Pr. 8
Torque
controllable range
OFF
+
Torque control
-
Speed estimator
Time
Motor
Encoder
I002534E
I001532E
5 - 143