YASKAWA E1000 Technical Manual page 234

5.8 L: Protection Functions
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L8-03: Overheat Pre-Alarm Operation Selection
Sets the operation when an overheat pre-alarm is detected.
Note: Change settings only when necessary.
No.
L8-03
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.
alarm. A digital output programmed for 4D is switched when the oH alarm is still active after ten reduction cycles.
Figure 5.81
Output frequency
f
ref
f × (L8-19)
ref
f × (L8-19) 2
ref
f × (L8-19) 3
ref
4
f × (L8-19)
ref
oH alarm number
Digital output (4D)
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L8-19: Frequency Reduction Rate during Overheat Pre-Alarm
Specifies how much the output frequency is reduced when L8-03 is set to 4 and an oH alarm is present. Set as a factor of
the maximum output frequency.
No.
L8-19
234
Name
Overheat Pre-Alarm Operation Selection
Figure 5.81
10 s 10 s
10 s
oH
Alarm
oH
Alarm
oH
Alarm
Figure 5.81 Output Frequency Reduction During Overheat Alarm
Name
Frequency Reduction Rate During Overheat Pre-Alarm
explains the operation with reduced speed during an oH
10 s 10 s 10 s
Reset oH
Alarm Reset oH
Alarm
YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
Setting Range
0 to 4
common_TMonly
10 s
oH
etc.
Alarm
time
Setting Range
0.1 to 0.9
Default
3
Default
0.8