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Torque control operation
4.2.6 Speed restriction
Set the speed restriction value to prevent the motor from over speeding due to a smaller load torque than the torque
command value.
Select the speed restriction input method using Pr. 807.
Parameter Name
Factory
Setting
Setting Range
807 Speed restriction selection 0 0, 1, 2
808 Forward rotation speed control 1500r/min 0 to 3600r/min
809 Reverse rotation speed control 9999 0 to 3600r/min, 9999
Pr. 807 Setting
Speed Restriction
Input Method
Operation
0
(factory setting)
Same method as speed
setting for speed
control
• Speed setting from the operation panel
• External analog command (terminal 1, 2)
• Multi-speed command
• Option (FR-V5AX etc.)
For both PU and external operations, the speed restriction changes according to
the acceleration/deceleration time. (Refer to 40 page)
1
Pr. 808 Forward
rotation speed control
Pr. 809 Reverse
rotation speed control
According to the rotation direction, set the speed restriction in forward and
reverse rotation directions individually. When the reverse rotation speed
restriction is 9999, the setting is the same as that of the torque restriction in
forward rotation direction.
( Refer to the Instruction Manual (detailed).)
2
Forward/reverse
rotation speed
restriction
(analog polarity
switchover speed
restriction)
(No. 1 terminal analog
input)
The analog voltage of the No. 1 terminal input is used to make speed restriction.
For 0 to 10V input, set the forward rotation speed restriction. (The reverse
rotation speed restriction is Pr. 1 "maximum speed" .) For -10 to 0V input, set the
reverse rotation speed restriction. (The forward rotation speed restriction is Pr. 1
"maximum speed".) The maximum speed of both the forward and reverse
rotations is Pr. 1 "maximum speed". When No. 1 terminal input is selected, set
"5" in Pr. 868 "No. 1 terminal function assignment".
( Refer to the Instruction Manual (detailed).)
(1) Calibration of torque command No. 3 terminal
Refer to the chart on the right for the relationship
between torque setting input voltage and output
voltage. The torque setting input signal is in pro-
portion to the output torque. Note that the motor-
developed torque varies with the motor tempera-
ture.
Use Pr. 904 and Pr. 905 to adjust bias/gain of
the No. 3 terminal. (Refer to page 47.)
-150%
10V Terminal 3
Gain
Pr. 905
Bias
Pr. 904
150%
Output torque
(Torque command)
-10V
0
+
+
-
-
PLG
0
1
2
orward, reverse rotation
peed restriction parameter
Forward/reverse rotation
speed restriction
(analog polarity switchover
speed restriction)
Torque command
Speed feedback<speed restriction value
Speed setting for
speed restriction
Speed control
(proportional control)
Speed feedback speed restriction value
Torque
control
+
Motor
Speed restriction
input selection