YASKAWA CIPR-GA50C series Technical Manual page 696

12.9 L: Protection Functions
Note:
The drive applies a hysteresis of approximately 10% of the drive rated output current or the motor rated torque to the overtorque/
undertorque detection function.
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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
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 will detect Mechanical Weakening. 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 Selection].
MFDO Function Select
• Terminal MA-MC
• Terminal P1-C1
• Terminal P2-C2
Operation Selection after Detection
Detection Start Time
Speed Range
Overtorque
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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
696
Figure 12.126 Undertorque Detection Time Chart
Table 12.71 Mechanical Weakening Detection Settings Parameters
Configuration Parameter
Detection Criteria
Detection Level
Detection Time
Detection Criteria
Detection Level
Detection Time
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the speed range that detects overtorque and undertorque and the operation of drives
(operation status) after detection.
Mechanical Deterioration 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
YASKAWA SIEPC71061753A GA500 Technical Manual
Default
(Range)
0
(0 - 8)