L6: Torque Detection - YASKAWA GA700 Technical Manual

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L6: Torque Detection

The overtorque/undertorque detection function prevents damage to machinery and loads.
Overtorque is the 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 the 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 outupt 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 11.74 to set the parameters.
Configuration Parameter
MFDO Function Select
• Terminals M1-M2
• Terminals M3-M4
• Terminals M5-M6
Detection conditions and selection of
operation after detection
Detection Level
Detection Time
*1 An analog input terminal can also supply the torque detection level. Set H3-xx = 7 [MFAI Function Select = Overtorque/Undertorque
DetectLvl] to enable this function. If L6-02 and H3-xx = 7, the analog input is more important, and the drive disables L6-02.
You cannot use Overtorque/Undertorque Detection 2 to set the detection level for the analog input terminals.
Note:
In V/f Control, the drive uses the current level (100% of the drive rated output current) to detect overtorque/undertorque. In vector
control, the drive uses the motor torque (100% of the motor rated torque)to detect overtorque/undertorque. When you enable the
mechanical weakening detection function, the overtorque/undertorque detection level for all control modes is the current level (100% of
the drive rated output current).
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Time Chart for Detection of Overtorque/Undertorque
Overtorque Detection Time Chart
When you use Overtorque/Undertorque Detection 1, the drive detects overtorque if the motor current or motor
torque is at the detection level set in L6-02 [Torque Detection Level 1] for the set in L6-03 [Torque Detection Time
1]. Parameter L6-01 [Torque Detection Selection 1] sets the operation after detection.
When you use Overtorque/Undertorque Detection 2, seet L6-05 [Torque Detection Level 2], L6-06 [Torque
Detection Time 2], and L6-04 [Torque Detection Selection 2].
Set the terminal that outputs the alarm in H2-01 to H2-03 [MFDO Function Select].
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Figure 11.142 Setting Digits and Fault Code
Table 11.74 Overtorque/Undertorque Detection Parameters
Overtorque/Undertorque Detection 1
H2-01, H2-02, and H2-03 = B
N.O.: Activated when detected
H2-01, H2-02, and H2-03 = 17
N.C.: Disactivated when detected
L6-01
L6-02
Analog Input Terminal
H3-xx = 7
L6-03
Overtorque/Undertorque Detection 2
H2-01, H2-02, and H2-03 = 18
N.O.: Activated when detected
H2-01, H2-02, and H2-03 = 19
N.C.: Disactivated when detected
L6-04
L6-05
-
*1
L6-06
11.9 L: Protection Functions
11
969