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5.8 L: Protection Functions
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
315
5
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. If the
temperature reaches the overheat fault level, the drive will trigger an oH1 fault and stop operation.
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.
Note:
Change settings only when necessary.
Setting 0: Ramp to stop
If an overheat alarm occurs, the drive decelerates to stop using the deceleration time 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 time (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.
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.
explains the operation with reduced speed during an
oH alarm. A digital output programmed for 4D is switched when the oH alarm is still active after ten reduction cycles.
No.
Name
Setting Range
Default
L8-02
Overheat Alarm Level
50 to 150°C
Determined by C6-01 and
o2-04
No.
Name
Setting Range
Default
L8-03
Overheat Pre-Alarm Operation Selection
0 to 4
3
SIEP_C710636_02B_1_0.book 315 ページ 2015年11月25日 水曜日 午後4時56分