Mitsubishi FR-A800

Torque control under Real sensorless vector control and vector control
PARAMETERS
219
5
5.4.5 Speed limit
Speed limit method selection (Pr.1113)
Control block diagram (Speed limit mode 1)
When operating under torque control, motor overspeeding may occur if the load torque drops to a value less than the
torque command value, etc. Set the speed limit value to prevent overspeeding.
If the actual speed exceeds the speed limit value, the control method switches from torque control to speed control,
preventing overspeeding.
Pr. Name
Initial
value
Setting
range
Description
FM CA
807
H410
Speed limit selection
0
0
Uses the speed command during speed control as the speed
limit.
1
Sets speed limits for forward and reverse directions
individually by using Pr.808 and Pr.809.
2
Forward/reverse rotation speed limit.
Applies speed limit by analog voltage input to the terminal 1.
Speed limit for forward/reverse side is switched by its polarity.
808
H411
Forward rotation speed
limit/speed limit
60Hz 50Hz 0 to 400 Hz Sets the forward side speed limit.
809
H412
Reverse rotation speed
limit/reverse-side speed
limit
9999
0 to 400 Hz Sets the reverse side speed limit.
9999 Pr.808 setting value is effective.
1113
H414
Speed limit method
selection
0
9999 Speed limit mode 1
0 Speed limit mode 2
1 Speed limit mode 3
2 Speed limit mode 4
10
X93-OFF: Speed limit mode 3
X93-ON: Speed limit mode 4
Pr.1113 setting Speed limit method Speed limit value
9999 Speed limit mode 1
Forward rotation speed limit
Pr.807=0: Speed commend under speed control
Pr.807=1: Pr.808
Pr.807=2: Analog input at analog input of 0 to 10 V
Pr.1 at analog input of -10 to 0 V
Reverse rotation speed limit
Pr.807=0: Speed commend under speed control
Pr.807=1: Pr.809 (Pr.808 when Pr.809="9999")
Pr.807=2: Pr.1 at analog input of 0 to 10 V
Analog input at analog input of -10 to 0 V
0 (initial value) Speed limit mode 2 Speed limit
Pr.807=0 or 2: Speed commend under speed control
Pr.807=1: Pr.808
Reverse-side speed limit
Pr.809 (Pr.808 when Pr.809="9999")
1 Speed limit mode 3
2 Speed limit mode 4
10 Switching by external terminals
X93-OFF: Speed limit mode 3
X93-ON: Speed limit mode 4
Sensorless
Sensorless
SensorlessSensorless
Sensorless
SensorlessSensorless
Sensorless
Sensorless
Vector
Vector
Vector
+
-
-
0
1
2
Parameter(Pr. 808, Pr. 809)
Forward/reverse rotation
speed limit
Torque command
Speed control
(proportional control)
Same method
as speed command input
Torque control
+
Motor
Pr. 807 Speed limit selection
Speed estimated value < speed limit value
Speed estimator
Real sensorless vector control
Vector control
Encoder
Speed estimated value speed limit value