2.9 L: Protection Functions
468 YASKAWA TOEPYAIGA8002B GA800 Drive Programming
■ Mechanical Weakening Detection
The Mechanical Weakening Detection function detects the mechanical weakening of a machine that can cause
overtorque or undertorque because of motor speed and total drive operation time.
The drive activates the function if the drive total operation time is longer than the time set in L6-11 [Mech Fatigue
Hold Off Time]. You can use U4-01 [Cumulative Ope Time] to monitor the total operation time.
Parameter Settings
The drive detects Mechanical Weakening if overtorque or undertorque occur during the speed range set in L6-08
[Mechanical Fatigue Detect Select] and L6-09 [Mech Fatigue Detect Speed Level] for the length of time set in L6-10
[Mech Fatigue Detect Delay Time]. The drive uses L6-01 to L6-03 [Torque Detection 1 Setting Parameter] to detect
oL5 [Mechanical Weakening Detection 1] or UL5 [Mechanical Weakening Detection 2]. Parameter L6-08 sets the
operation after detection.
Set the terminal that outputs the fault in H2-01 to H2-03 [MFDO Function Select].
Table 2.71 Mechanical Weakening Detection Settings Parameters
Configuration Parameter Mechanical Deterioration Detection
MFDO Function Select
• Terminals M1-M2
• Terminals M3-M4
• Terminals M5-M6
H2-01, H2-02, and H2-03 = 22
Operation Selection after Detection L6-08
Detection Start Time L6-11
Speed Range
Detection Criteria L6-08
Detection Level L6-09
Detection Time L6-10
Overtorque
Detection Criteria L6-01
Detection Level L6-02
Detection Time L6-03
■ L6-01: Torque Detection Selection 1
No.
(Hex.)
Name Description
Default
(Range)
L6-01
(04A1)
Torque Detection Selection 1
Sets the speed range that detects overtorque and undertorque and the operation of drives (operation
status) after detection.
0
(0 - 8)
The drive detects overtorque if the motor current or output torque is more than the level set in L6-02 [Torque
Detection Level 1] for the length of time set in L6-03 [Torque Detection Time 1]. The drive detects undertorque if the
motor current or output torque is less than the level set in L6-02 for the length the time set in L6-03.
0 : Disabled
The drive will not detect overtorque or undertorque.
1 : oL @ Speed Agree - Alarm only
The drive detects overtorque when the output frequency aligns with the frequency reference. Detection does not occur
during acceleration/deceleration. The drive outputs an oL3 [Overtorque Detection 1] and operation continues.
2 : oL @ RUN - Alarm only
When the Run command is enabled, the drive constantly detects overtorque. The drive outputs an oL3 and operation
continues.
3 : oL @ Speed Agree - Fault
The drive detects overtorque when the output frequency aligns with the frequency reference. Detection does not occur
during acceleration/deceleration. The drive outputs an oL3 [Overtorque Detection 1] and operation stops.
4 : oL @ RUN - Fault
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