YASKAWA L1000A - L7: Torque Limit

5.8 L: Protection Functions
234 YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
■ L6-02, L6-05: Torque Detection Level 1, 2
These parameters set the detection levels for the torque detection functions 1 and 2. In V/f control mode, these levels are
set as a percentage of the drive rated output current, while in vector control modes these levels are set as a percentage of
the motor rated torque.
■
L6-03, L6-06: Torque Detection Time 1, 2
These parameters determine the time required to trigger an alarm or fault after exceeding the levels in L6-02 and L6-05.
◆ L7: Torque Limit
The torque limit function can be used to limit the torque in each of the four quadrants individually and thereby protect the
elevator. It can be used in OLV, CLV, and CLV/PM control modes. The limit can be set by parameters. A digital output
programmed for “During torque limit” (H2-01 through H2-05 = 30) will be switched when the drive is operating at the
torque limit.
■
Setting Torque Limits
The torque limits are defined by parameters L7-01 to L7-04 for each of the four operation quadrants. Figure 5.42 shows
which of the limit settings is applied in each quadrant.
Note: The maximum output torque is ultimately limited by the drive output current. Output torque will not exceed the limit set for the
drive rated current, even if the torque limits are set to higher values.
Figure 5. 42
Figure 5.42 Torque Limit Parameters
■ L7-01 to L7-04: Torque Limits
These parameters set the torque limits in each operation mode.
A setting of 100% is equal to the motor rated torque.
No. Parameter Name Setting Range Default
L6-02 Torque Detection Level 1 0 to 300% 150%
L6-05 Torque Detection Level 2 0 to 300% 150%
No. Parameter Name Setting Range Default
L6-03 Torque Detection Time 1 0.0 to 10.0 s 0.1 s
L6-06 Torque Detection Time 2 0.0 to 10.0 s 0.1 s
No. Parameter Name Setting Range Default
L7-01
Forward Torque Limit
0 to 300% 200%
L7-02
Reverse Torque Limit
0 to 300% 200%
L7-03
Forward Regenerative Torque Limit
0 to 300% 200%
L7-04
Reverse Regenerative Torque Limit
0 to 300% 200%
positive torque reference
negative torque reference
Parameter L7-04
REV motor rotation
Parameter L7-02
Parameter L7-01
FWD motor rotation
Parameter L7-03
quadrant 2
quadrant 3
quadrant 1
quadrant 4
REV run regenerative
REV run motoring
FWD run motoring
FWD run regenerative
common_TMonly
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