Speed Limit (Pr. 807 To Pr. 809) - Mitsubishi Electric FR-A700 Instruction Manual

Parameter
6.4.5

Speed limit (Pr. 807 to Pr. 809)

Set the speed limit value to prevent overspeed of the motor in case the load torque becomes less
than the torque command value, etc. during torque control operation.
Pr.
Name
No.
807
Speed limit selection
Forward rotation
808
speed limit
Reverse rotation speed
809
limit
Control block diagram
Same method as speed
(Pr. 808, Pr. 809)
Forward/reverse rotation
Fig. 6-30: Control block diagram
FR-A700 EC
Initial
Setting Range
Value
0
1
0
2
50Hz 0–120Hz
0–120Hz
9999
9999
Torque command
Pr. 807
Speed limit
selection
command input
Parameter
speed limit
Torque control by real sensorless vector control, vector control
Sensorless Sensorless Sensorless Vector Vector Vector
Description
Use the speed command value dur-
ing speed control as speed limit.
According to Pr. 808 and Pr. 809 ,
set the speed limit in forward and
reverse rotation directions individu-
ally.
Forward/reverse rotation speed limit
The analog voltage of the terminal 1
input is used to make speed limit.
The speed limit of the forward rota-
tion and reverse rotation is switched
according to the polarity.
Set the speed limit for the forward
rotation direction.
Set the speed limit of the reverse
rotation side.
As set in Pr. 808.
Speed estimated value < speed limit value
Drehzahlregelung
(P-Anteil)
Speed estimated value ≥ speed limit value
Real sensorless vector control
Encoder feedback in vector control
Parameters referred to
1 Maximum
frequency,
2 Minimum
frequency
7 Acceleration time
8 Deceleration time
13 Starting frequency
4–6 Multi-speed
24–27 operation
232–239
868 Terminal 1 func-
tion assignment
125 Frequency setting
126 voltage (current)
C2–C7 bias/gain
C12–C15
Torque
control
Encoder
Speed estimator in
real sensorless
vector control
Refer to
Section
6.8.1
6.8.1
6.11.1
6.11.1
6.11.2
6.10.1
6.3.2
6.20.5
M
3~
I001531E
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