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-
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 5.86
and
Figure 5.87
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 5.86 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 5.87 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 L6-02/05 for longer
than the time set in L6-03/06. The parameters L6-01/04 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
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 detection and an oL3/oL4 alarm is triggered.
5.8 L: Protection Functions
200
SIEP C710606 20 OYMC AC Drive - V1000 User Manual
7/16/2008-13:23
