Setting the operation data
−106−
5 Operation in speed control mode
2.5 Setting the torque limit
The maximum output torque of the motor can be limited. Set when the motor torque is suppressed for safe uses or it is
limited according to a load.
Setting range: 0 to 250%
This section explains how to set the torque limit by external DC voltage as an example.
Note
The motor may not start operating with the set torque limiting value depending on variations in load torque,
individual dierences in motors, gearheads or drivers, as well as operating environment.
Set the torque limiting value with providing a margin of 20% or more as a guide.
Assignment of the TL input
When the TL input is assigned to any of the input terminals, the torque will be limited by the ON-OFF status of the TL
input.
When the TL input is ON: The torque limiting function is enabled, and the maximum output torque of the motor is limited.
When the TL input is OFF: The torque limiting function is disabled, and the maximum output torque of the motor is the
peak torque.
Note
When the TL input is not assigned to the input terminal, this input will be always set to ON. If the TL input is
assigned to multiple input terminals, the function will be performed when all of the terminals are turned ON.
Setting by external DC voltage
When using external DC voltage, set the "Analog speed torque"
parameter (ID: 2161) to "2: Torque."
0 to 10 VDC
1 mA or more
power supply
Pin No.2 VM input
Pin No.3 VL input
•
External DC voltage - Torque limiting characteristics
(representative values)
0
50
100
150
200
250
300
13
5
External DC voltage (V)
Motor shaft torque limiting value (%)
Note
Be sure to use the external DC voltage at 10 VDC or lower. When connecting the external DC power supply,
make sure the polarities are correct. If the polarities are reversed, the driver may be damaged.
2.6 Gain adjustment and oset adjustment for analog external setting device
If parameters are adjusted when the operating speed or the torque limiting value is set using an analog external setting
device, the slope of the speed command or the oset can be changed.
Note
For the operating speed and the torque limiting value, an amount of variation with respect to the setting
voltage varies depending on a product.
Gain adjustment and oset adjustment for operating speed
Adjust using the following parameters.
0
Analog speed command
gain (ID: 2256)
Analog speed command
maximum value (ID: 2261)
110
Rotation speed
Analog speed command
oset (ID: 2257)
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