5.8 L: Protection Functions
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
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Setting 3: Stop when motor speed is greater than L6-09 (signed) (Fault)
Detection when the speed is above L6-09 (signed). Upon detection operation is stopped and an oL5 fault is output.
Setting 4: Stop when Motor Speed is Greater than L6-09 (Fault)
Detection when the speed is above L6-09 (unsigned). Upon detection operation is stopped and an oL5 fault is output.
Setting 5: Continue running if the speed is less than L6-09 (signed) (Alarm)
Detection when the speed is below L6-09 (signed). Upon detection operation continues, but a UL5 alarm is output.
Setting 6: Continue running if the speed is less than L6-09 (Alarm)
Detection when the speed is below L6-09 (unsigned). Upon detection operation continues, but a UL5 alarm is output.
Setting 7: Stop when Motor Speed is less than L6-09 (signed) (Fault)
Detection when the speed is below L6-09 (signed). Upon detection operation is stopped and a UL5 fault is output.
Setting 8: Stop when motor speed is less than L6-09 (Fault)
Detection when the speed is below L6-09 (unsigned). Upon detection the operation is stopped and a UL5 fault is output.
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L6-09: Mechanical Weakening Detection Speed Level
Sets the speed level for Mechanical Weakening Detection.
The value is set as a percentage of the maximum frequency. If L6-08 is set for unsigned speed detection (L6-08 = 2, 4, 6,
8) then the absolute value of L6-09 is used (negative settings are treated as positive values).
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L6-10: Mechanical Weakening Detection Time
Sets the time permitted for the situation selected in parameter L6-08 to arise before mechanical weakening is detected.
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L6-11: Mechanical Weakening Detection Start Time
Sets the drives cumulative operation time at which Mechanical Weakening Detection is activated. If U4-01 reaches the
L6-11 value, the function is activated.
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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
machinery. It can be used in OLV, CLV, AOLV/PM, and CLV/PM control modes. The limit can be either set by
parameters or by analog inputs. A digital output programmed for “During torque limit” (H2-01, H2-02, H2-03 = 30) can
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. Analog inputs can
also be used to either define a general limit for all operation conditions (H3-02, H3-06, H3-10 = 15) or for setting
separate limits for each operation condition (H3-02, H3-06, H3-10 = 10, 11, or 12).
shows which of the
limit settings is applied in each quadrant.
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 limit set for the drive rated current, even if the torque limits are set to higher values.
Example: If parameter L7-01 = 130%, L7-02 to L7-04 = 200%, and a general torque limit of 150% is set by an analog
input (H3-02, H3-06, H3-10 = 15), then the torque limit in quadrant 1 will be 130%, but 150% in all other quadrants.
No.
Name
Setting Range
Default
L6-09
Mechanical Weakening Detection Speed Level
-110.0 to 110.0%
110.0%
No.
Name
Setting Range
Default
L6-10
Mechanical Weakening Detection Time
0.0 to 10.0 s
0.1 s
No.
Name
Setting Range
Default
L6-11
Mechanical Weakening Detection Start Time
0 to 65535 h
0 h
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