Mitsubishi Electric FR-E800, Инструкция по эксплуатации

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147
6. Torque Control
6.5 Speed limit
1
2
3
4
5
6
7
8
9
10
6.5
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 reaches or exceeds the speed limit value, the control method switches from torque control to speed control,
preventing overspeeding.
*1 Gr.1 and Gr.2 are the parameter initial value groups. (Refer to page 52 ).
 Control block diagram
 Using the speed command during speed control (Pr.807 = "0" (initial
value))
• Speed limit is set by the same method as speed setting during speed control (speed setting by the operation panel, multi-
speed setting, plug-in option, etc.).
• When the start signal turns ON, the limit level increases from 0 Hz to the set speed by taking the time set in Pr.7
Acceleration time . When the start signal turns OFF, the limit level at the time decreases to the operation start level of
Pr.10 DC injection brake operation frequency , by taking the time set in Pr.8 Deceleration time.
Sensorless Sensorless Sensorless Vector Vector Vector
Pr. Name
Initial value
*1
Setting
range
Description
Gr.1 Gr.2
807
H410
Speed limit selection 0
0 Uses the speed command during speed control as the speed limit.
1
Sets the speed limits for forward and reverse directions individually by
using
Pr.808 and Pr.809 .
808
H411
Speed limit 60 Hz 50 Hz 0 to 400 Hz Sets speed limit.
809
H412
Reverse-side speed limit 9999
0 to 400 Hz
Sets the speed limit when the load has reversed the motor rotation
opposite to the torque polarity.
9999 Pr.808 setting value is effective.
+
-
-
0
1
Parameter( Pr. 808, Pr. 809 )
Torque command
Speed 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
Speed estimated value speed limit value
Vector control
Encoder
STF(STR) ON OFF
Speed
Forward rotation
Speed setting
value during
speed control
Pr.7
Time
Torque controllable
range
The speed setting
value is the speed
limit value.
Pr.8
Reverse rotation