YASKAWA GA700 Technical Manual page 866

11.9 L: Protection Function
Figure 11.137 Drive Operation at a Diminished Output Frequency when the Overheat Alarm is Output
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L8-05: Input Phase Loss Protect Select
No.
Name
(Hex.)
L8-05 Input Phase Loss
Protect Select
(04B1)
0 : Disabled
1 : Enabled
Detects input phase loss by measuring ripples in DC bus voltage.
Input phase loss is detected when power supply phase loss occurs or the main circuit capacitor deteriorates, which
causes PF [Input Phase Loss] to appear on the keypad.
Disable the input power supply phase loss detection function in the following circumstances.
• During deceleration
• The run command is not input
• The output current is less than 30% of the drive rated current
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L8-07: Output Phase Loss Protect Select
No.
Name
(Hex.)
L8-07 Output Phase Loss
Protect Select
(04B3)
Note:
Output phase loss detection can mistakenly be triggered in the following situations. Disable output phase loss protection.
• The motor rated current is very small compared to the drive rating.
• Operates PM motors with light loads.
0 : Disabled
1 : 1PH Loss Det
An LF [Output Phase Loss] is triggered when one output phase is lost.
The output shuts off and the motor coasts to stop.
2 : 2/3PH Loss Det
An LF [Output Phase Loss] is triggered when two or more output phases are lost.
The output shuts off and the motor coasts to stop.
866
V/f CL-V/f OLV CLV AOLV
Enables or disables input phase loss detection.
V/f CL-V/f OLV CLV AOLV
Enables or disables the output phase loss detection. Output phase loss
detection is triggered when the output current falls below 5% of the drive
rated current.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default Setting
(Range)
0
(0, 1)
Default
(Range)
0
(0 - 2)