MHT258a (Engl.)5-31
5.6 Torque control
This section explains the signal concerning torque control.
Control input signal : Torque control (38)
5.6.1 Torque control
While torque control (38) signal is on, the amplifier can control the output torque of motor shaft using the torque control function.
With “speed zero” [NZERO] output on, “torque control” signal on, torque control is enabled.
Torque is actually output during the on period of forward command [FWD] or reverse command [REV].
Torque command is given as the input voltage to the terminal [TREF].
[TREF] terminal voltage Output torque (rated torque as 100%)
±9 [V] ±300%
The rotational direction depends on forward command [FWD] or reverse command [REV]. See 6.1.1 Change of rotational direction.
■ Interface
■ Parameter setting
To allocate the torque control signal to the control input terminal, set (38) to the system para. If this signal is not allocated to the control
input terminal, this signal is deemed "always off."
■ Related items
・Maximum speed
If the motor is rotating at no-load, the motor speed fluctuates by some ±100[r/min] though the speed is being limited by basic para. 16.
This is because speed control is not carried out in torque control.
Basic parameter 16
Para. Name Setting range Initial value Change
16 Maximum speed 0.01 to Max. speed [r/min] (in 0.01 steps) (Max. speed) Always
Maximum speed depends on the basic para. 16 at factory shipment. Maximum speed can also be limited by the input voltage to speed
command [NREF] terminal by setting system para. 61.
Torque control (38)
ON : In torque control status
OFF : In speed control status
Torque command [TREF]
Input impedance 20kΩ
M24
2.2k
-24V
P24
M5
22k
220k
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