L8: Drive Protection - YASKAWA FSDrive-MV1000 Parameter Manual

2.8 L: Protection Functions

◆ 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. 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-
temperature rises above L8-02.
No.
L8-02
<1> For details on the default settings, refer to
L8-03: Overheat Pre-Alarm Operation Selection
■
Sets the operation when an overheat pre-alarm is detected.
No.
L8-03 Overheat Pre-Alarm Operation Selection
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-
Setting 1: Coast to stop
If heatsink 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-
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-
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
after 10 s the oH alarm is still present, the speed is reduced once more. 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.
alarm. A contact output programmed for 4D is switched when the oH alarm is still active after ten reduction cycles.
212
Name
Overheat Alarm Level
Defaults by Drive Model Selection (o2-04) on page
Name
= E), this output will be triggered.
= E), this output will be triggered.
= E), this output will be triggered.
= 20), the switch will close when the thermistor
Setting Range
50 to 150°C
Setting Range
0 to 4
Figure 2.79 explains the operation with reduced speed during an oH
YASKAWA ELECTRIC EZZ010930 FSDrive-MV1000 Parameter Guide
Default
Determined by o2-04
<1>
82.
Default
3