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5-11 Sensorless Vector Control
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-A@@@@)
5
Functions
Torque Limit Function
This function limits the motor output torque. This function is enabled only when Sensorless
Vector Control is selected for control method (A044/A244 = 03).
You can select any of the following 3 torque limit functions from Torque Limit Selection (b040).
Four-quadrant separate setting mode
In this mode, torque limits are set separately for the four quadrants of forward power running, forward
regeneration, reverse power running and reverse regeneration, using Torque Limits 1 to 4 (b041 to b044).
Terminal switching mode
In this mode, the values set in Torque Limits 1 to 4 (b041 to b044) are switched based on the combination
of torque limit switching terminals 1 and 2 (TRQ1,TRQ2) which are set using multi-function input terminals.
Selected torque limit values are enabled for all operation modes.
Analog input mode
In this mode, the torque limits are set based on the voltage applied to the FV terminal (analog
voltage) on the control terminal block.
0 to 10 V correspond to torque limit values of 0% to 200%. Selected torque limit values are
enabled for all operation modes.
Option mode
This mode is valid when an optional board is used. Refer to the manual for the optional board.
If the Torque limit enabled function (40: TL) is set to a multi-function input terminal, the torque
limit function set in b040 is enabled only when TL is turned ON. When TL is off, the torque limit
setting is disabled, and the maximum value is defined as the torque limit value. If the Torque
limit enabled function (40: TL) is not set to a multi-function input terminal, the torque limit
function set in Torque Limit Selection (b040) is always enabled.
The torque limit value under this function assumes that the torque corresponding to the
Inverter's rated current is 100%. Accordingly, the absolute value of torque varies depending on
the motor to be combined.
When the Torque limit (10: TRQ) is selected in the multi-function output selection, the torque
limit signal turns on when the above torque limit function is activated.
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