Yaskawa Z1000U - Manual (Page 169)

n L8-03: Overheat Pre-Alarm Operation Selection
Sets the operation when an overheat pre-alarm is detected.
Note: Change L8-03 setting only when necessary.
No. Name Setting Range Default
L8-03 Overheat Pre-Alarm Operation Selection 0 to 4 4
Setting 0: Ramp to Stop
If an overheat alarm occurs, the drive decelerates to stop using the currently selected deceleration time. If a digital output is
programmed for “fault” (H2-oo = E), this output will be triggered.
Setting 1: Coast to Stop
If an overheat alarm occurs, the drive switches off the output and the motor coasts to stop. If a digital output is programmed
for “fault” (H2-oo = E), this output will be triggered.
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. Figure 4.37 explains the operation with reduced speed during an oH alarm. A digital
output programmed for 4D is switched when the oH alarm is still active after ten reduction cycles.
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
Figure 4.37 Output Frequency Reduction During Overheat Alarm
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
4.12 Advanced Drive Setup Adjustments
YASKAWA ELECTRIC TOEP C710636 10B Z1000U HVAC MATRIX Drive User Manual 169
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Start-Up Programming & Operation