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5.8 L: Protection Functions
316
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
Figure 5.102
Figure 5.102 Output Frequency Reduction During Overheat Alarm
■
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: 1.
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.
2.
Output phase loss detection is not possible when the drive is running a PM motor with light load.
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
stop.
Setting 2: Fault when two phases are lost
An output phase loss fault (LF) is triggered when two and more output phases are lost. The output shuts off and the motor
coasts to stop.
■
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.
■
L8-10: Heatsink Cooling Fan Operation Selection
Selects the heatsink cooling fan operation.
No.
Name
Setting Range
Default
L8-07
Output Phase Loss Protection Selection
0 to 2
0
No.
Name
Setting Range
Default
L8-09
Output Ground Fault Detection Selection
0 or 1
1
No.
Name
Setting Range
Default
L8-10
Heatsink Cooling Fan Operation Selection
0 or 1
0
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
Digital output (4D)
oH
Alarm
oH
Alarm
oH
Alarm
oH
Alarm
oH alarm number
SIEP_C710636_02B_1_0.book 316 ページ 2015年11月25日 水曜日 午後4時56分