YASKAWA FSDrive-MV1000 Parameter Manual page 209

Mechanical Weakening Detection
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This function can be used to detect mechanical weakening of a machine that leads to overtorque or undertorque situations
after a certain machine operation time has elapsed.
The function is activated in the drive when the cumulative operation counter U4-01 exceeds the time set in parameter L6-
11. Mechanical Weakening Detection uses the torque detection 1 settings (L6-01 to L6-03) and triggers an oL5
(Mechanical Weakening Detection 1) or UL5 (Mechanical Weakening Detection 2) fault when overtorque or undertorque
occurs in the speed range determined by parameters L6-08 and L6-09. The operation of the drive after detection of oL5
or UL5 is set by parameter L6-08.
To output a signal for Mechanical Weakening Detection, set H2-
L6-08: Mechanical Weakening Detection Operation
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Sets the speed range to detect mechanical weakening and the action to take when mechanical weakening is detected.
No.
L6-08 Mechanical Weakening Detection Operation
Setting 0: Disabled
Setting 1: Continue running if the speed is greater than L6-09 (signed) (alarm)
Detection when the speed is above L6-09 (signed). Upon detection operation continues, but an oL5 alarm is output.
Setting 2: Continue running if the speed is greater than L6-09 (alarm)
Detection when the speed is above L6-09 (unsigned). Upon detection operation continues, but an oL5 alarm is output.
Setting 3: Stop when motor speed is greater than L6-09 (signed)
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
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)
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
Detection when the speed is below L6-09 (unsigned). Upon detection the operation is stopped and a UL5 fault is output.
L6-09: Mechanical Weakening Detection Speed Level
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Sets the speed level for Mechanical Weakening Detection.
No.
L6-09 Mechanical Weakening Detection Speed Level
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).
L6-10: Mechanical Weakening Detection Time
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Sets the time permitted for the situation selected in parameter L6-08 to arise before mechanical weakening is detected.
No.
L6-10 Mechanical Weakening Detection Time
YASKAWA ELECTRIC EZZ010930 FSDrive-MV1000 Parameter Guide
Name
Name
Name
to 22.
Setting Range
0 to 8
Setting Range
-110.0 to 110.0%
Setting Range
0.0 to 10.0 s
2.8 L: Protection Functions
Default
0
Default
110.0%
Default
0.1 s
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