12.8 L: PROTECTION
796 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
The drive uses the deceleration time set in C1-09 [Fast Stop Time] to stop the motor. Fault relay output terminal
1NO-1CM will activate, and 1NC-1CM will deactivate.
3 : Alarm Only
oH is shown on the keypad and operation continues. The output terminal set for Alarm [H2-01 to H2-03 = 4]
activates.
4 : Run@L8-19 Rate
The drive decelerates to the level set in L8-19 [Frq Reduct@oHPre-Alarm] and continues operation. oH flashes
on the keypad.
If the oH alarm continues for 10 seconds, the drive decelerates again. When the alarm is output, the drive
decelerates each 10 seconds. If the drive decelerates 10 times and the alarm continues to be output, the output
terminal set for oH Pre-Alarm Reduction Limit [H2-01 to H2-03 = 4F] activates. When the alarm is not output
during deceleration, the drive accelerates until it is at the frequency reference that was applicable before the alarm
was turned off. Figure 12.139 shows the output of the alarm and the drive operation at a decreased output
frequency.
Figure 12.139 Drive Operation at a Decreased Output Frequency when the Overheat Alarm is Output
■ L8-05 In PhaseLoss Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-05
(04B1)
In PhaseLoss Selection
Sets the function to enable and disable input phase loss detection.
1
(0, 1)
0 : Disabled
1 : Enabled
The drive measures ripples in DC bus voltage to detect input phase loss.
The drive detects phase loss when power supply phase loss occurs or the main circuit capacitor becomes unusable,
which causes PF [Input Phase Loss] to show on the keypad.
Disable the detection of the input power supply phase loss function in these conditions:
• During deceleration
• The run command is not input
• The output current is less than 30% of the drive rated current.
■ L8-07 Out PhaseLoss Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-07
(04B3)
Out PhaseLoss Selection
Sets the function to enable and disable output phase loss detection. The drive starts output phase
loss detection when the output current decreases to less than 5% of the drive rated current.
0
(0 - 2)
Time
f
r e f
× ( L8 - 19 )
f
r e f
× ( L8 - 19 )
2
f
r e f
× ( L8 - 19 )
4
f
r e f
× ( L8 - 19 )
3
f
r e f
Output frequency
Multi-function
Digital Output Terminal
oH
Alarm
oH
Alarm
oH
Alarm
oH
Alarm
oH Alarm
Cancel
oH Alarm
Cancel
O N
oH Alarm count
10 s 10 s 10 s 10 s 10 s 10 s 10 s
1 2 3 4 5 6 10
H2-01 through H2-03 = 4F
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