122 Control macros
Torque control macro
This macro is used in applications in which torque control of the motor is required.
These are typically tension applications, where a particular tension needs to be
maintained in the mechanical system.
Torque reference is given through analog input AI2, typically as a current signal in the
range of 0…20 mA (corresponding to 0…100% of rated motor torque).
The start/stop signal is connected to digital input DI1. The direction is determined by
DI2. Through digital input DI3, it is possible to select speed control (EXT1) instead of
torque control (EXT2). As with the PID control macro, speed control can be used for
commissioning the system and checking the motor direction.
It is also possible to change the control to local (control panel or PC tool) by pressing
the Loc/Rem key. By default, the local reference is speed; if a torque reference is
required, the value of parameter 19.16 Local control mode should be changed to
To r qu e.
A constant speed (by default, 300 rpm) can be activated through DI4. DI5 switches
between acceleration/deceleration time sets 1 and 2. The acceleration and
deceleration times are defined by parameters 23.12…23.15.
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