Setting 0: Count Successful Restarts
The drive will continuously attempt to restart. If
a restart trial is successful, the restart counter is increased. This operation
is repeated each time a fault occurs until the counter reaches the value set in L5-01.
Setting 1: Count Restart Attempts
The drive will try to restart using the time interval set in parameter L5-04. Each attempt is counted, whether it was successful
or not.
u
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). They are
set up using the L6-oo parameters. To indicate the underload or overload
condition to an external device, digital outputs should be programmed as shown below.
H2-01 /02/03 Setting Description
B Torque detection 1, N.O. (output close when over-/underload is detected)
17 Torque detection 1, N.C. (output opens when over-/underload is detected)
18 Torque detection 2, N.O. (output close when over-/underload is detected)
19 Torque detection 2, N.C. (output opens when over-/underload is detected)
Figure 5.88 and Figure 5.89 show the function 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 5.88 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 5.89 Undertorque Detection Operation
Note: 1. The torque detection function uses a hysteresis of 10% of the drive rated output current/motor rated torque.
2. In V/f Control and Open Loop Vector Control for PM, the level is set as a percentage of the drive rated output current. In Open
Loop Vector, it is set as a percentage of the motor rated torque.
Note: When
overtorque
occurs
in
the
application,
the
drive
may stop due to overcurrent (oC) or overload (oL1). To prevent this, an overload
situation should be indicated to the controller before oC or oL1 occur in the drive. Use the torque detection for this purpose. Use
undertorque detection to discover application problems like a torn belt, a pump shutting off, or other similar trouble.
n
L6-01/L6-04: Torque Detection Selection 1/2
The torque detection function is triggered when the current/torque exceeds the levels set in parameter L6-02/L6-05 for
longer than the time set in L6-03L6-/06. The parameters L6-01/L6-04 select the detection condition and the operation at
detection.
No. Name Setting Range Default
L6-01/ L6-04 Torque Detection Selection 1/2 0 to 8 0
Setting 0: Disabled
5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
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5
Parameter Details
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