YASKAWA OYMC V1000, Programming Manual

Page: 212 / 408

1.8 L: Protection Functions
212 YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual
Figure 1.85
Figure 1.85 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.
NOTICE: When overtorque occurs in the application, the drive may stop on account of 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.
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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.
Setting 0: Disabled
Setting 1: OL3/OL4 at Speed Agree - Alarm
Overload 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.
Setting 2: OL3/OL4 at Run - Alarm
Overload detection works whenever a Run command is active. The operation continues after
detection and an OL3/OL4 alarm is triggered.
No. Name Setting Range Default
L6-01/
L6-04
Torque Detection Selection 1/2 0 to 8 0
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