2.8 L: Protection Functions
YASKAWA ELECTRIC
TOEP C710687 03B FSDrive-MV1000 Parameter Guide
219
Figure 2.80
Figure 2.80 Output Frequency Reduction during IGBT Overheat Pre-Alarm
n
L8-19: Frequency Diminution Rate During Overheat Pre-Alarm
Specifies how much the output frequency is reduced when L8-03 is set to 4 and an overheat pre-alarm is triggered. Set as
a factor for the maximum output frequency.
n
L8-07: Output Phase Loss Protection Selection
Enables or disables the output phase loss detection, which is triggered when the output current falls below 5% of the
drive rated current.
Note:
Output phase loss detection can mistakenly be triggered if the motor rated current is very small compared to the drive rating.
Disable this parameter in such cases.
Setting 0: Disabled
Setting 1: Fault when one phase is lost
An output phase loss fault (LF) is triggered when one output phase is lost. The output shuts off and the motor coasts to a
stop.
Setting 2: Fault when two or more phases are lost
An output phase loss fault (LF) is triggered when two or more output phases are lost. The output shuts off and the motor
coasts to a stop.
n
L8-09: Output Ground Fault Detection Selection
Enables or disables the output ground fault detection.
Setting 0: Disabled
Ground faults are not detected.
Setting 1: Enabled
A ground fault (GF) is triggered when high leakage current or a ground short circuit occurs in one or two output phases.
No.
Name
Setting Range
Default
L8-19
Frequency Reduction Rate during Overheat
Pre-Alarm
0.1 to 0.9
0.8
No.
Name
Setting Range
Default
L8-07
Output Phase Loss Protection Selection
0 to 2
2
No.
Name
Setting Range
Default
L8-09
Output Ground Fault Detection Selection
0, 1
1
10 s
etc.
time
10 s
10 s
10 s
10 s
10 s
10 s
f
ref
× (L8-19)
f
ref
× (L8-19)
2
f
ref
× (L8-19)
4
f
ref
× (L8-19)
3
f
ref
Output frequency
Reset oH
Alarm
Reset oH
Alarm
Contact ouput (4D)
oH
Alarm
oH
Alarm
oH
Alarm
oH
Alarm
oH alarm number
ON (closed)
common_TMonly
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