L7: Torque Limit - YASKAWA A1000 HHP Programming Manual

No.
L6-09 Mechanical Weakening Detection Speed Level
n L6-10: Mechanical Weakening Detection Time
Sets the time permitted for the situation selected in parameter L6-08 to arise before detecting mechanical weakening.
No.
L6-10
n L6-11: Mechanical Weakening Detection Start Time
Sets the cumulative drive operation time at which Mechanical Weakening Detection is activated. The function activates when
U4-01 reaches the L6-11 value.
No.
L6-11
u

L7: Torque Limit

The torque limit function limits the torque in each of the four quadrants individually to protect machinery in OLV, CLV,
AOLV/PM, and CLV/PM control modes. Set the limit through parameters, analog inputs, or by switching a digital output
programmed for "During torque limit" (H2-01, H2-02, H2-03 = 30) when the drive is operating at the torque limit.
n Setting Torque Limits
Parameters L7-01 to L7-04 define the torque limits for each of the four operation quadrants. it is also possible to use Analog
inputs to define a general limit for all operation conditions (H3-02, H3-06, H3-10 = 15) or to set separate limits for each
operation condition (H3-02, H3-06, H3-10 = 10, 11, or 12).
If two limit values are defined for the same operation conditions, the drive will use the lower value.
Note: The maximum output torque is ultimately limited by the drive output current (max. 150% of drive rated current in HD, 120% in ND). Output
torque will not exceed the drive rated current limit even if the torque limits are set to higher values.
Example: If parameter L7-01 = 130%, L7-02 to L7-04 = 200%, and an analog input sets a general torque limit of 150% (H3-02,
H3-06, H3-10 = 15), then the torque limit will be 130% in quadrant 1, but 150% in the other quadrants.
REV motor rotation
n L7-01 to L7-04: Torque Limits
These parameters set the torque limits in each quadrant.
No.
L7-01
L7-02
L7-03
L7-04
Note: If the multi-function analog input is programmed for "10: Forward torque limit", "11: Reverse torque limit", "12: Regenerative torque
limit", or "15: General torque limit", the drive uses the lowest value from L7-01 through L7-04, or analog input torque limit.
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
Name
Name
Mechanical Weakening Detection Time
Name
Mechanical Weakening Detection Start Time
Positive torque reference
REV run regenerative
10: Positive Torque Limit
12: Regenerative Torque Limit
15: Torque Limit
Parameter L7-04
Quadrant 2
Quadrant 3
11: Negative Torque Limit
15: Torque Limit
Parameter L7-02
REV run motoring
Negative torque reference
Figure 1.104 Torque Limit Parameters and Analog Input Settings
Name
Forward Torque Limit
Reverse Torque Limit
Forward Regenerative Torque Limit
Reverse Regenerative Torque Limit
Setting Range
-110.0 to 110.0%
Setting Range
0.0 to 10.0 s
Setting Range
0 to 65535 h
Figure 1.104 shows limit setting is applied in each quadrant.
FWD run motoring
10: Positive Torque Limit
15: Torque Limit
Parameter L7-01
Quadrant 1
Quadrant 4
11: Negative Torque Limit
12: Regenerative Torque Limit
15: Torque Limit
Parameter L7-03
FWD run regenerative
Setting Range
1.8 L: Protection Functions
Default
110%
Default
0.1 s
Default
FWD motor rotation
Default
0 to 300% 200%
0 to 300% 200%
0 to 300% 200%
0 to 300% 200%
0 h
1
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