YASKAWA GA700 Technical Manual page 857

The detection level for the analog input terminals cannot be set with Overtorque/Undertorque Detection 2.
Note:
The current level (100% of the drive rated output current) is used for the detection of overtorque/undertorque under V/f Control. The
motor torque (100% of the motor rated torque) is used for the detection of overtorque/undertorque under vector control. If the
mechanical weakening detection function is enabled, the overtorque/undertorque detection level under all control modes is the current
level (100% of the drive rated output current).
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Detection of Overtorque/Undertorque Time Chart
Overtorque Detection Time Chart
When using Overtorque/Undertorque Detection 1, overtorque is detected when the motor current or motor torque
is at least the detection level set to L6-02 [Torque Detection Level 1] continues for at least the time set to L6-03
[Torque Detection Time 1]. The operation after detection is set in L6-01 [Torque Detection Selection 1].
Set L6-05 [Torque Detection Level 2], L6-06 [Torque Detection Time 2], and L6-04 [Torque Detection Selection
2] if using Overtorque/Undertorque Detection 2.
Set the terminal that outputs the alarm in H2-01 to H2-04 [MFDO Function Select].
Note:
A hysteresis of approximately 10% of the drive rated output current or the motor rated torque is applied to the overtorque/undertorque
detection function.
Undertorque Detection Time Chart
When using Overtorque/Undertorque Detection 1, undertorque is detected if the motor current or motor torque
continues to be less than or equal to the detection level set in L6-02 for at least the time set in L6-03. The
operation after detection is set in L6-01.
Set the operation in L6-05, L6-06, and L6-0 to use Overtorque/Undertorque Detection 2.
Set the terminal that outputs an alarm in H2-01 to H2-04.
Note:
A hysteresis of approximately 10% of the drive rated output current or the motor rated torque is applied to the overtorque/undertorque
detection function.
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Mechanical Deterioration Detection Function
Mechanical Weakening Detection detects the mechanical weakening of a machine that leads to overtorque or
undertorque situations on the basis of motor speed and drive cumulative operation time.
The function is activated in the drive when the drive cumulative operation time exceeds the time set to L6-11
[MechanicalWeakeningDetectSrtTime]. The drive cumulative operation time can be monitored via U4-01
[Cumulative Ope Time].
Parameter Settings
Mechanical Weakening Detection is detected when an overtorque or undertorque occurs during the speed range
set in L6-08 [Mechanical Weakening Detect Ope] and L6-09 [MechanicalWeakeningDetectSpdLvl] for a time that
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Figure 11.134 Overtorque Detection Time Chart
Figure 11.135 Undertorque Detection Time Chart
11.9 L: Protection Function
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