1.8 L: Protection Functions
214 YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual
■ Mechanical Weakening Detection
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 (L6-01/02/03) and triggers an OL5 fault when overtorque or undertorque occurs in
the speed range determined by parameter L6-08/09. The OL5 operation is set by parameter
L6-08.
To output a signal for mechanical weakening detection, set H2-01, H2-02, or H2-03 to 22.
■ L6-08: Mechanical Weakening Detection Operation
Decides in which speed range the function is active and sets the 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 the operation is
continued 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 the operation is
continued 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 the 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 the operation is
stopped and an OL5 fault is output.
No. 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. Name Setting Range Default
L6-08 Mechanical Weakening Detection 0 to 8 0
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