Yaskawa Z1000 AC Drive HVAC - Manual (Page 176)

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 ouput (4D)
oH
Alarm
oH
Alarm
oH
Alarm
oH
Alarm
oH alarm number
Figure 4.36 Output Frequency Reduction During Overheat Alarm
n L8-05: Input Phase Loss Protection Selection
Enables or disables the input phase loss detection.
No. Name Setting Range Default
L8-05 Input Phase Loss Protection Selection 0, 1 1
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 L8-06: Input Phase Loss Detection Level
Sets the Input Phase Loss Detection (PF) Level.
Triggers PF fault when there is an imbalance larger than the value set to L8-06 in the drive input power voltage.
Detection Level = 100% = Voltage Class ×
No. Name Setting Range Default
L8-06 Input Phase Loss Detection Level 0.0 to 25.0%
Determined by
o2-04
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. Name Setting Range Default
L8-07 Output Phase Loss Protection Selection 0 to 2 1
4.13 Advanced Drive Setup Adjustments
176 YASKAWA ELECTRIC TOEP YAIZ1U 03A YASKAWA AC Drive – Z1000 User Manual