L7: Torque Limit - Omron Q2A Series Technical Manual

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L6-58 MechF Method
No.
Name
(Hex.)
L6-58 MechF Method
(04D4)
◆

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 150% of the rated output current for Heavy Duty
Rating (HD) and to 120% of the rated output current for Normal Duty Rating (ND). 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 [FW Torque Limit to RV Reg. TrqLimit] to individually set the four torque limit quadrants.
• Use MFAI to individually set the four torque limit quadrants. Set H3-02, H3-06, H3-10 = 9, B, C [AI Function
Select = FW Trq Lim, Rev Trq Lim, RegenTrqLim].
• Use MFAI to set all four torque limit quadrants together. Set H3-02, H3-06, H3-10 = D [GenerTrqLim].
• Use a communication option to set all four torque limit quadrants together.
Figure 12.138 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, the lower value
is enabled.
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, L7-03, L7-04 = 200%, MFAI torque limit = 150%
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L7-01 FW Torque Limit
No.
Name
(Hex.)
L7-01 FW Torque Limit
(04A7)
RUN
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
V/f CL-V/f OLV CLV
Sets the speed where the drive detects mechanical deterioration and how the drive operates
(operation status) after detection. Only available when L6-08 = 1 [MechF Enable = Enabled].
Use parameter L6-57 [MechF AbsSpeed] to either use absolute speed or signed speed value.
Figure 12.138 Torque Limits and Analog Input Setting Parameters
V/f CL-V/f OLV CLV
Sets the torque limit value for forward motoring as a percentage, where motor rated torque is the
100% value.
Description
AOLV OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
AOLV OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
12.8 L: PROTECTION
Default
(Range)
0
(0, 1)
Default
(Range)
200%
(0 - 300%)
771
12