Speed Limit - Mitsubishi Electric 800 Series Instruction Manual

5.4.5

Speed limit

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
807
Speed limit selection
H410
808 Forward rotation speed
H411 limit/speed limit
Reverse rotation speed
809
limit/reverse-side speed
H412
limit
1113 Speed limit method
H414 selection
Speed limit method selection (Pr.1113)
Pr.1113 setting Speed limit method
9999 Speed limit mode 1
0 (initial value) Speed limit mode 2
1 Speed limit mode 3
2 Speed limit mode 4
10 Switching by external terminals
Control block diagram (Speed limit mode 1)
Pr. 807 Speed limit selection
Same method
as speed command input
Parameter(Pr. 808, Pr. 809)
Forward/reverse rotation
speed limit
Torque control under Real sensorless vector control and vector control
Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Vector Sensorless Vector Vector
Initial Setting
value range
0
1
0
2
60Hz 0 to 400 Hz
0 to 400 Hz
9999
9999
9999
0
1
0
2
10
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
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
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")
X93-OFF: Speed limit mode 3
X93-ON: Speed limit mode 4
Speed estimated value < speed limit value
Torque command
0
1
+
2
- Speed estimated value
Real sensorless vector control
Description
Uses the speed command during speed control as the speed
limit.
Sets speed limits for forward and reverse directions
individually by using Pr.808 and Pr.809.
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.
Sets the forward side speed limit.
Sets the reverse side speed limit.
Pr.808 setting value is effective.
Speed limit mode 1
Speed limit mode 2
Speed limit mode 3
Speed limit mode 4
X93-OFF: Speed limit mode 3
X93-ON: Speed limit mode 4
Speed limit value
Pr.1 at analog input of -10 to 0 V
Analog input at analog input of -10 to 0 V
+
Torque control
-
Speed control
(proportional control)
speed limit value
Speed estimator
Vector control
Motor
Encoder
195
PARAMETERS
5