YASKAWA GA800 Programming Manual page 468

2.9 L: Protection Functions
■
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].
MFDO Function Select
• Terminals M1-M2
• Terminals M3-M4
• Terminals M5-M6
Operation Selection after Detection
Detection Start Time
Speed Range
Overtorque
■
L6-01: Torque Detection Selection 1
No.
Name
(Hex.)
L6-01 Torque Detection Selection 1
(04A1)
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
468
Table 2.71 Mechanical Weakening Detection Settings Parameters
Configuration Parameter
Detection Criteria
Detection Level
Detection Time
Detection Criteria
Detection Level
Detection Time
V/f CL-V/f OLV CLV
Sets the speed range that detects overtorque and undertorque and the operation of drives (operation
status) after detection.
H2-01, H2-02, and H2-03 = 22
L6-08
L6-11
L6-08
L6-09
L6-10
L6-01
L6-02
L6-03
Description
AOLV OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
YASKAWA TOEPYAIGA8002B GA800 Drive Programming
Mechanical Deterioration Detection
Default
(Range)
0
(0 - 8)