YASKAWA CIMR-ZU A Series Programming Manual page 120

1 8 L Protection Functions
Settin 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- = E), this output will be triggered.
Settin Alarm Only
If an overheat alarm occurs, an alarm is output and the drive continues operation.
Settin Operation it
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)
ref
f × (L8-19)
ref
f × (L8-19)
ref
oH alarm number
Digital output (4D)
L8 1 Fre uency eduction ate durin O er eat 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
L8 Input P ase Loss Protection Selection
Enables or disables the input phase loss detection.
No
L8-05
Settin Disabled
Settin 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.
12
educed Speed
Figure 1.71
10 s 10 s
oH
Alarm
oH
Alarm
2
3
4
Fi ure 1 71 Output Fre uency eduction Durin O er eat Alarm
Name
Name
Input Phase Loss Protection Selection
explains the operation with reduced speed during an oH alarm. A digital
10 s 10 s 10 s 10 s
Reset oH
Alarm Reset oH
Alarm
oH
Alarm
10 s
oH
etc.
Alarm
Settin an e
10.0 to 100.0%
Settin an e
0, 1
time
De ault
20.0%
De ault
1