Mitsubishi Electric FR-A800, Instruction Manual

Page: 317 / 1042

Parameters Torque control under Real sensorless vector control and vector control
FR-A800 5 - 137
Control block diagram (Speed limit mode 1)
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.
I002534E
Fig. 5-48: Control block diagram
I001532E
Fig. 5-49: Use the speed command for speed control
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
5-401.)
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.
+
-
-
0
1
2
+
Same method
as speed command input
Parameter (Pr. 808, Pr. 809)
Forward/reverse rotation
speed limit
Pr. 807 Speed limit selection
Torque command
Speed estimated value < speed limit value
Speed estimated value speed limit value
Real sensorless vector control
Vector control
Speed estimator
Speed control
(proportional control)
Torque control
Motor
Encoder
The speed setting value is
a speed limit value.
Pr. 8
Pr. 7
Time
Torque
controllable range
STF (STR)
Speed setting
value during
speed control
Speed
Forward rotation
Reverse rotation
ON OFF