YASKAWA LA500 - L7: Torque Limit

Parameter Details
12
12.7 L: Protection Functions
YASKAWA SIEPYEULA5001C LA500 Technical Manual 337
When the Run command is enabled, the drive constantly detects undertorque. The drive outputs a UL4 and
operation stops
■ L6-05: Torque Detection Level 2
No.
(Hex.)
Name Description
Default
(Range)
L6-05
(04A5)
Torque Detection Level 2
Sets the detection level for Overtorque/Undertorque Detection 2. In V/f control, drive rated output
current = 100% value. In vector control, motor rated torque = 100% value.
150%
(0 - 300%)
Note:
Overtorque/Undertorque Detection 2 cannot set the detection level for the analog input terminal.
■ L6-06: Torque Detection Time 2
No.
(Hex.)
Name Description
Default
(Range)
L6-06
(04A6)
Torque Detection Time 2
Sets the detection time for Overtorque/Undertorque Detection 2.
0.1 s
(0.0 - 10.0 s)
◆ L7: Torque Limit
■ Overview
The torque limit function limits the internal torque reference for the drive to and keeps the torque from the motor
constant. This function limits the torque applied to loads and regenerative torque to a value less than a set
quantity. This function also prevents damage to machinery and increases the reliability of continuous operation.
You can set torque limits individually for the four quadrants, which include torque direction (motoring/
regeneration) and direction of motor rotation (forward/reverse). When the torque reference value is at the set
torque limit, the MFDO terminal set for During Torque Limit [H2-xx = 30] activates.
Note:
• The drive output current limits maximum output torque. The drive limits torque to 150% of the rated output current for 60 seconds, or
165% of the rated output current for 30 seconds. The actual output torque is not more than the limits of the drive rated output current
when you set the torque limit to a high value.
• When you use torque limits, do not lower the torque limit value too much. When the torque limit function is triggered, falls and
rollbacks can occur because of sudden acceleration stops and stalls of the motor.
■ Configuring Settings
Use one of these methods to set torque limits:
• Individually set the four torque limit quadrants using L7-01 to L7-04 [Torque Limit].
• Use a communication option to set all four torque limit quadrants together.
Figure 12.33 shows the configuration method for each quadrant.
Figure 12.33 Torque Limits and Analog Input Setting Parameters
V/f
OLV
V/f
OLV