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L6: Torque Detection
The drive provides two independent torque detection functions that trigger an alarm or fault signal when the load is too heavy
(oL), or suddenly drops (UL). These functions are set up using the L6-oo parameters. Program the digital outputs as shown
below to indicate the underload or overload condition to an external device:
Note: When overtorque occurs in the application, the drive may stop due to overcurrent (oC) or overload (oL1). To prevent the drive from stopping,
use torque detection to indicate an overload situation to the controller before oC or oL1 occur. Use undertorque detection to discover application
problems like a torn belt, a pump shutting off, or other similar trouble.
H2-01, H2-02, H2-03
Setting
Description
B Torque detection 1, N.O. (output closes when overload or underload is detected)
17 Torque detection 1, N.C. (output opens when overload or underload is detected)
18 Torque detection 2, N.O. (output close when overload or underload is detected)
19 Torque detection 2, N.C. (output opens when overload or underload is detected)
Figure 5.101 and Figure 5.102 illustrate the functions of overtorque and undertorque detection.
Motor current / torque
L6-02/05
10 % hysteresis
Torque detection 1 (NO)
or
Torque detection 2 (NO)
L6-03/06
ON
L6-03/06
10 % hysteresis
ON
Figure 5.101 Overtorque Detection Operation
Motor current / torque
L6-02/05
10 % hysteresis
Torque detection 1 (NO)
or
Torque detection 2 (NO)
L6-03/06
ON
L6-03/06
ON
Figure 5.102 Undertorque Detection Operation
Note: 1. The torque detection function uses a hysteresis of 10% of the drive rated output current and motor rated torque.
2. In V/f, V/f w/PG and OLV/PM, the level is set as a percentage of the drive rated output current. In OLV, CLV, AOLV/PM and CLV/PM,
the level is set as a percentage of the motor rated torque.
n
L6-01, L6-04: Torque Detection Selection 1, 2
The torque detection function is triggered when the current or torque exceed the levels set to L6-02 and L6-05 for longer than
the times set to L6-03 and L6-06. L6-01 and L6-04 select the conditions for detection and the operation that follows.
No. Name Setting Range Default
L6-01 Torque Detection Selection 1 0 to 8 0
L6-04 Torque Detection Selection 2 0 to 8 0
Setting 0: Disabled
Setting 1: oL3, oL4 at speed agree (Alarm)
Overtorque detection is active only when the output speed is equal to the frequency reference (i.e., no detection during
acceleration and deceleration). The operation continues after detecting overtorque and triggering an oL3/oL4 alarm.
5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
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Parameter Details
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