L6: Torque Detection - YASKAWA GA800 Technical Reference

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L5-08: Fault Reset Enable Select Grp2
No.
Name
(Hex.)
L5-08 Fault Reset Enable Select
Grp2
(0B2B)
0000 : Disabled
0001 : Enabled (—/–/—/GF)
0010 : Enabled (—/–/oH1/–)
0011 : Enabled (—/–/oH1/GF)
0100 : Enabled (—/ov/—/–)
0101 : Enabled (—/ov/—/GF)
0110 : Enabled (—/ov/oH1/–)
0111 : Enabled (—/ov/oH1/GF)
1000 : Enabled (Uv1/–/—/–)
1001 : Enabled (Uv1/–/—/GF)
1010 : Enabled (Uv1/–/oH1/–)
1011 : Enabled (Uv1/–/oH1/GF)
1100 : Enabled (Uv1/ov/—/–)
1101 : Enabled (Uv1/ov/—/GF)
1110 : Enabled (Uv1/ov/oH1/–)
1111 : Enabled (Uv1/ov/oH1/GF)
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L6: Torque Detection

The overtorque/undertorque detection function prevents damage to machinery and loads.
Overtorque is when there is too much load on the machine. If the motor current or output torque is at the overtorque
detection level for the overtorque detection time, the drive will output an alarm and turn off the output.
Undertorque is when a load suddenly decreases. When the motor current or output torque is at the undertorque
detection level for the undertorque detection time, the drive will output an alarm and turn off the output.
You can use the undertorque detection function to detect these conditions, for example:
• Machine belt cuts
• Unusual operation of the electromagnetic contactor on the drive output side
• Clogged output side air filters in fans and blowers
• Damage to blade tips and broken string
Note:
If there is oC [Overcurrent] or oL1 [Motor Overload], the drive can stop during overtorque conditions. Use torque detection to identify
overload conditions before the drive detects oC or oL1 and stops. Use this function to detect issues that occur in the application.
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Parameter Settings
You can individually set the two overtorque/undertorque detection functions with the drive. Use the information in
Table 12.70 to set the parameters.
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
V/f CL-V/f OLV CLV AOLV
Use these 4 digits to set the Auto Restart function for Uv1, ov, oH1, and GF. From left to right, the
digits set Uv1, ov, oH1, and GF, in order.
Figure 12.138 Setting Digits and Fault Code
12.9 L: Protection Functions
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default
(Range)
1111
(0000 - 1111)
12
989