YASKAWA P1000 Technical Manual page 259

Output frequency
f
ref
f × (L8-19)
ref
f × (L8-19)
2
ref
f × (L8-19)
3
ref
f × (L8-19)
4
ref
oH alarm number
Digital output (4D)
n L8-19: Frequency Reduction Rate during Overheat Pre-Alarm
Specifies the output frequency reduction when L8-03 is set to 4 and an oH alarm is present.
No.
L8-19 Frequency Reduction Rate During Overheat Pre-Alarm
n L8-05: Input Phase Loss Protection Selection
Enables or disables the input phase loss detection.
No.
L8-05
Setting 0: Disabled
Setting 1: Enabled
Enables input phase loss detection. Since measuring the DC bus ripple detects input phase loss, a power supply voltage
imbalance or main circuit capacitor deterioration may also trigger a phase loss fault (PF).
Detection is disabled if:
• The drive is decelerating.
• No Run command is active.
• Output current is less than or equal to 30% of the drive rated current.
n L8-07: Output Phase Loss Protection Selection
Enables or disables the output phase loss detection 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.
No.
L8-07
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.
YASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual
10 s 10 s
10 s
oH
Alarm
oH
Alarm
oH
Alarm
Figure 5.84 Output Frequency Reduction During Overheat Alarm
Name
Name
Input Phase Loss Protection Selection
Name
Output Phase Loss Protection Selection
10 s 10 s 10 s
Reset oH
Alarm Reset oH
Alarm
5.8 L: Protection Functions
10 s
oH
etc.
Alarm
time
Setting Range
0.1 to 0.9
Setting Range
0, 1
Setting Range
0 to 2
Default
0.8
Default
1
5
Default
1
259