YASKAWA AC Drive-A1000 Technical Manual page 264

5.8 L: Protection Functions
Output frequency
f
f × (L8-19)
ref
f × (L8-19)
ref
f × (L8-19)
ref
f × (L8-19)
ref
oH alarm number
Digital ouput (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. Set as a factor of the maximum
output frequency.
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: 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.
No.
L8-07
Setting 0: Disabled
264
10 s 10 s
ref
oH
Alarm
oH
Alarm
2
3
4
Figure 5.104 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 10 s
Reset oH
Alarm
Reset oH
oH
Alarm
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
10 s
Alarm
oH
etc.
Alarm
Setting Range
0.1 to 0.9
Setting Range
0, 1
Setting Range
0 to 2
time
Default
0.8
Default
1
Default
0