Mitsubishi Electric FR-A800, Instruction Manual

Page: 316 / 1042

Torque control under Real sensorless vector control and vector control Parameters
5 - 136
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.
Speed limit method selection (Pr. 1113)
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
60 Hz 50 Hz 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. 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
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
Tab. 5-49: Selecting the speed limit mode
Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Sensorless Vector Vector Vector