RX Quick Start Guide
30 RX Quick Start Guide
3.16 Torque limit
Torque limit function allows you to limit the motor output when sensorless vector control “03”, 0-Hz sensorless vector control
“04” or sensor vector control “05” is selected in A044. In open loop vector function has limited accuracy and repeatability, per-
formance is much better when encoder feedback is used. You can choose between different options using parameter b040.
• Quadrant specific setting mode (b040=00) in which individual torque limit values are applied on the four quadrants (for-
ward powering, reverse regeneration...) by torque limits 1 to 4 (b041 to b044)
• Terminal-switching mode (b040=01) where the torque limit values set in torque limits 1 to 4 (b041 to b044) are switched
depending on the combination of the states of the torque limit switch terminals 1 and 2 (TRQ1 and TRQ2) assigned to digital
inputs.
• Analog voltage input mode (b040=02) where the torque limit value is set by a voltage applied to the terminal O. Range 0 to
10V corresponds with torque limit range between 0 and 200% that is valid for all operating states.
• Option 1 and 2 allows to give the torque limit value from a communication option board installed on the inverter.
If “TL” torque limit enable functions has been assigned to any of the multi-function inputs the setting of parameter b040 only is
valid when this input is ON. No torque limitation will be applied when the input is OFF.
100% torque is referred to inverter rated current, absolute torque value is up the motor to be combined. Range for inverters from
75 to 132KW is limited to 180% instead of 200%.
Parameter Parameter name Description
b040 Torque limit selection 00: 4-quadrant (Four-quadrant separate setting)
01: TRQ input (Terminal switch)
02: [O] input (Analog input)
03: Option 1
04: Option 2
b041 Torque limit 1 (fwd/power) 0 to 200% (0.4 to 55 kW)
0 to 180% (75 to 132 kW)
no (torque limit disabled)
b022 Torque limit 2 (rev/regen.) 0 to 200% (0.4 to 55 kW)
0 to 180% (75 to 132 kW)
no (torque limit disabled)
b043 Torque limit 3 (rev/power) 0 to 200% (0.4 to 55 kW)
0 to 180% (75 to 132 kW)
no (torque limit disabled)
b044 Torque limit 4 (fwd/regen.) 0 to 200% (0.4 to 55 kW)
0 to 180% (75 to 132 kW)
no (torque limit disabled)
b045 Torque LADSTOP selection 00: OFF (Disabled)
01: ON (Enabled)
Forward rotation
Reverse rotation
Regeneration
(
b042
)
Torque
(+)
Torque
(-)
Powering
(
b043
)
Powering
(
b041
)
Regeneration
(
b044
)
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