Speed Limit - Mitsubishi Electric FR-A820-00046 Instruction Manual

Torque control under Real sensorless vector control and vector control
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.
807
H410
808
H411
809
H412
1113
H414
Speed limit method selection (Pr. 1113)
Pr. 1113 setting
9999
0 (initial value)
1
2
10
Tab. 5-50:
5 - 142
Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Vector Sensorless Sensorless Sensorless Vector Vector
Initial value
Name
FM
Speed limit selection
Forward rotation speed
60 Hz 50 Hz 0 to 400 Hz Sets the forward side speed limit.
limit/speed limit
Reverse rotation speed
limit/reverse-side speed
limit
Speed limit method
selection
Speed limit method
Speed limit mode 1
Speed limit mode 2
Speed limit mode 3
Speed limit mode 4
Switching by external terminals
Selecting the speed limit mode
Setting
Description
range
CA
Uses the speed command during speed control as the
0
speed limit.
Sets speed limits for forward and reverse directions
1
individually by using Pr. 808 and Pr. 809.
0
Forward/reverse rotation speed limit.
Applies speed limit by analog voltage input to the
2 terminal 1.
Speed limit for forward/reverse side is switched by its
polarity.
0 to 400 Hz Sets the reverse side speed limit.
9999
9999 Pr. 808 setting value is effective.
9999 Speed limit mode 1
0 Speed limit mode 2
1 Speed limit mode 3
0
2 Speed limit mode 4
X93-OFF: Speed limit mode 3
10
X93-ON: Speed limit mode 4
Speed limit value
Forward rotation speed limit
Pr. 8 07 = 0: Speed commend under speed control
Pr. 8 07 = 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
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
Parameters