5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual 235
■ L7-16: Torque Limit Process at Start
Assigns a time filter to allow the torque limit to build at start.
Setting 0: Disabled
Toque limit is created at start without a delay time. Disable L7-16 to maximize response time when the application
requires sudden acceleration or deceleration at start.
Setting 1: Enabled
A time filter is added to allow the torque limit to build at start.
◆ L8: Drive Protection
■ L8-02: Overheat Alarm Level
Sets the overheat alarm (oH) detection level.
The drive will output an alarm when the heatsink temperature exceeds the alarm level set in parameter L8-02.
When an output terminal is set for the oH pre-alarm (H2- = 20), the switch will close when the heatsink temperature
rises above L8-02.
■
L8-03: Overheat Pre-Alarm Operation Selection
Sets the operation when an overheat pre-alarm is detected.
Setting 0: Ramp to stop
If an overheat alarm occurs, the drive decelerates to stop using the deceleration ramp currently selected. If a digital output
is programmed for “fault” (H2- = E), this output will be triggered.
Setting 1: Coast to stop
If heatsink overheat (oH) occurs, the drive switches off the output and the motor coasts to stop. If a digital output is
programmed for “fault” (H2- = E), this output will be triggered.
Setting 2: Fast Stop
If an overheat alarm occurs, the drive decelerates to stop using the Fast Stop ramp (C1-09). If a digital output is
programmed for “fault” (H2- = E), this output will be triggered.
Setting 3: Alarm only
If an overheat alarm occurs, an alarm is output and the drive continues operation.
No. Parameter Name Setting Range Default
L7-16 Torque Limit Process at Start 0 to 1 1
No. Parameter Name Setting Range Default
L8-02 Overheat Alarm Level 50 to 150°C Determined by o2-04
No. Parameter Name Setting Range Default
L8-03 Overheat Pre-Alarm Operation Selection 0 to 3 3
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