YASKAWA FSDrive-MV1000 - L8: Drive Protection

2.8 L: Protection Functions
218 YASKAWA ELECTRIC TOEP C710687 03B FSDrive-MV1000 Parameter Guide
u L8: Drive Protection
n L8-02: Overheat Alarm Level
Sets the overheat alarm (oH) detection level.
The drive will output an alarm when the temperature of the IGBTs exceeds the alarm level set in parameter L8-02. If the
operation when this alarm occurs is set for continued operation (L8-03 = 4) and the temperature reaches the overheat
fault level, the drive will trigger an oH fault and stop operation.
When an output terminal is set for the oH pre-alarm (H2- = 20), the switch will close when the thermistor
temperature rises above L8-02.
n
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 a stop using the deceleration time currently selected. If a contact
output is programmed for “fault” (H2- = E), this output will be triggered.
Setting 1: Coast to stop
If IGBTs overheat (oH) occurs, the drive switches off the output and the motor coasts to a stop. If a contact 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 a stop using the Fast Stop time (C1-09). If a contact 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.
Setting 4: Operation with reduced speed
If an overheat alarm occurs, the operation is continued but the speed is reduced to the level set in parameter L8-19. If the
oH alarm is still present after 10 s, the speed is reduced again. The amount of reduction depends on how often the alarm
repeats. If the oH alarm disappears while the drive is operating at a reduced speed, then the drive will switch back to the
previous speed it was reduced to before. Figure 2.80 explains the operation with reduced speed during an oH alarm. A
contact output programmed for 4D is switched when the oH alarm is still active after ten reduction cycles.
No.
<1> For details on the default settings, refer to Defaults by Drive Model Selection (o2-04) on page 87.
Name Setting Range Default
L8-02 Overheat Alarm Level 50 to 150 °C Determined by o2-04 <1>
No. Name Setting Range Default
L8-03 Overheat Pre-Alarm Operation Selection 0 to 4 3
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