L7: Torque Limit - YASKAWA L1000A Technical Manual

◆ 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 vector 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.
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Setting Torque Limits
The torque limits are defined by parameters L7-01 to L7-04 for each of the four operation quadrants.
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 5.39
REV run regenerative
Parameter L7-04
REV motor rotation
Parameter L7-02
REV run motoring
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L7-01 to L7-04: Torque Limits
These parameters set the torque limits in each operation mode.
No.
L7-01
L7-02
L7-03
L7-04
◆ L8: Drive Protection
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L8-02: Overheat Alarm Level
Sets the overheat alarm (oH) detection level.
The drive will output an alarm when the heatsink temperature exceeds the alarm level set in parameter L8-02.
When an output terminal is set for the oH pre-alarm (H2-
rises above L8-02.
No.
L8-02
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L8-03: Overheat Pre-Alarm Operation Selection
Sets the operation when an overheat pre-alarm is detected.
No.
L8-03
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
positive torque reference
quadrant 2 quadrant 1
quadrant 3 quadrant 4
negative torque reference
Figure 5.39 Torque Limit Parameters
Name
Forward Torque Limit
Reverse Torque Limit
Forward Regenerative Torque Limit
Reverse Regenerative Torque Limit
Name
Overheat Alarm Level
Name
Overheat Pre-Alarm Operation Selection
5.8 L: Protection Functions
FWD run motoring
Parameter L7-01
FWD motor rotation
Parameter L7-03
FWD run regenerative
common_TMonly
Setting Range
0 to 300%
0 to 300%
0 to 300%
0 to 300%
= 20), the switch will close when the heatsink temperature
Setting Range
50 to 150 °C
Setting Range
0 to 3
Figure 5.39 shows
Default
200%
200%
200%
200%
5
Default
Determined by o2-04
Default
3
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