L7: Torque Limit - YASKAWA HV600 Manual

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L6-14: Motor Underload Level @ Min Freq
No.
Name
(Hex.)
L6-14 Motor Underload Level @
Min Freq
(062F)
◆

L7: Torque Limit

The torque limit function limits the internal torque reference for the drive to limit the quantity of torque generated by
the motor to a constant quantity. This function keeps the torque applied to loads and regenerative torque 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 110% of the rated output current. 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 for lifting applications, 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.
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Configuring Settings
Use one of these methods to set torque limits:
• Use L7-01 to L7-04 [Torque Limit] to set the four torque limit quadrants individually.
• Use MFAI to set the four torque limit quadrants individually. Set H3-02, H3-10 = 10, 11, 12 [MFAI Function Select
= Forward/Reverse/Regenerative Torque Limit].
• Use MFAI to set all four torque limit quadrants together. Set H3-02, H3-10 = 15 [General Torque Limit].
• Use a communication option to set all four torque limit quadrants together.
Figure 2.106 shows the configuration method for each quadrant.
Note:
• When L7-01 to L7-04 and analog inputs or communication option torque limits set torque limits for the same quadrant, he drive enables the
lowest value.
In this example of parameter settings, the torque limit for quadrant 1 is 130% and the torque limit for quadrants 2, 3, and 4 is 150%.
Settings: L7-01 = 130%, L7-02 to L7-04 = 200%, and MFAI torque limit = 150%
• The drive output current limits maximum output torque. The torque limit is to 120% of the rated output current. 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.
YASKAWA TOEPYAIHV6002A HV600 Drive Programming
V/f OLV/PM EZOLV OLV/PM
Sets the UL6 [Undertorque Detection 6] detection level at minimum frequency by percentage of
drive rated current.
Figure 2.106 Torque Limits and Analog Input Setting Parameters
Description
2.9 L: Protection Functions
Default
(Range)
15%
(0 - 300%)
2
381