12.8 L: PROTECTION
778 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
If you set L7: TORQUE LIMIT and L8-27 to the same value or almost the same value, the drive can detect oC
[Overcurrent]. Lower the torque limit when you use a Yaskawa motor. When you use a non-Yaskawa motor,
measure the irreversible demagnetization resistance before you adjust this parameter.
Note:
The overcurrent detection function detects the lower of these two values:
• Drive overcurrent level
• Motor rated current × L8-27 / 100
■ L8-29 LF2 Unbalance Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-29
(04DF)
LF2 Unbalance Selection
Sets the function to detect LF2.
1
(0, 1)
This function prevents damage to PM motors. Current unbalance can heat a PM motor and demagnetize the
magnets. When the current is unbalanced, the drive will detect LF2 to stop the motor and prevent damage to the
motor.
0 : Disabled
1 : Enabled
■ L8-31 LF2 Detect Time
No.
(Hex.)
Name Description
Default
(Range)
L8-31
(04E1)
LF2 Detect Time
Sets the LF2 [Output Current Imbalance] detection time.
3
(1 to 100)
When the output current is unbalanced for longer than the time set in L8-31, the drive detects LF2.
Note:
• Set L8-29 = 1 [LF2 Unbalance Selection = Enabled] to enable this parameter.
• If the drive detects LF2 by error, increase the setting value of L8-31 in 5-unit increments.
• The keypad shows this parameter when E9-01 = 1 [Motor Type Selection = PM] under EZ Open Loop Vector Control.
■ L8-32 Fan Failure Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-32
(04E2)
Fan Failure Selection
Sets operation when the drive detects FAn [Internal Agitating Fan Fault].
1
(0 - 4)
0 : Ramp->Stop
The drive ramps to stop in the selected deceleration time. Fault relay output terminal 1NO-1CM will activate, and
1NC-1CM will deactivate.
1 : Coast->Stop
The drive output shuts off and the motor coasts to stop. Fault relay output terminal 1NO-1CM will activate, and
1NC-1CM will deactivate.
2 : Fast Stop (C1-09)
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 = 10]
activates.
4 : Run@L8-19 Rate
The drive decelerates to the level set in L8-19 [Frq Reduct@oHPre-Alarm] and continues operation. FAn flashes
on the keypad. Refer to “L8-03 Overheat Pre-Alarm Selection” for more information about drive derating
operation.
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