YASKAWA Z1000 User Manual page 183

Setting 2: Fast Stop
If an overheat alarm occurs, the drive decelerates to stop using the Fast Stop time (C1-09). If a digital output is programmed
for "fault" (H2-oo = E), this output will be triggered.
Setting 3: Alarm Only
If an overheat alarm occurs, an alarm is output and the drive continues operation.
Setting 4: Operation with Reduced Speed
If an overheat alarm occurs, the operation continues with the speed reduced to the level set to parameter L8-19. If the oH alarm
is still present after 10 s, the speed is reduced again. The amount of speed reduction depends on how often the alarm repeats.
If the oH alarm disappears while the drive is operating at a reduced speed, the drive will switch to the previous speed in 10 s
increments until reaching base frequency.
output programmed for 4D is switched when the oH alarm is still active after ten reduction cycles.
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 L8-05: 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 L8-06: 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 ×
YASKAWA ELECTRIC TOEP C710616 45F YASKAWA AC Drive – Z1000 User Manual
Figure 4.35 explains the operation with reduced speed during an oH alarm. A digital
10 s 10 s 10 s
oH
Alarm
Reset oH
oH
Alarm
oH
Alarm
Figure 4.35 Output Frequency Reduction During Overheat Alarm
Name
Input Phase Loss Protection Selection
4.13 Advanced Drive Setup Adjustments
10 s 10 s 10 s
Alarm Reset oH
Alarm
10 s
etc. oH
Alarm
time
Setting Range
0, 1
Default
1
4
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