L6: Torque Detection - Omron Q2A Series Technical Manual

12.8 L: PROTECTION
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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 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 12.55 to set the parameters.
Configuration Parameter
DO Function Select
• Terminals 2NO-2CM
• Terminals 3CO-3CM
• Terminals 4NO-4CM
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 = E [AI Function Select = OvUntrq Level] to enable
this function. If L6-02 and H3-xx = E, 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 [Trq Det1 Level] for the set in L6-03 [Trq Det1 Time]. Parameter L6-
01 [Trq Det1 Select] sets the operation after detection.
When you use Overtorque/Undertorque Detection 2, seet L6-05 [Trq Det2 Level], L6-06 [Trq Det2 Time], and L6-
04 [Trq Det2 Select].
Set the terminal that outputs the alarm in H2-01 to H2-03 [DO Function Select].
766
Figure 12.135 Setting Digits and Fault Code
Table 12.55 Overtorque/Undertorque Detection Parameters
Overtorque/Undertorque Detection 1
H2-01, H2-02, and H2-03 = 32
N.O.: Activated when detected
H2-01, H2-02, and H2-03 = 33
N.C.: Disactivated when detected
L6-01
L6-02
Analog Input Terminal
H3-xx = E
L6-03
H2-01, H2-02, and H2-03 = 37
N.O.: Activated when detected
H2-01, H2-02, and H2-03 = 38
N.C.: Disactivated when detected
L6-04
L6-05
*1
-
L6-06
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Overtorque/Undertorque Detection 2