Parameter Details
12
12.8 L: PROTECTION
SIEPYEUOQ2A01G AC Drive Q2A Technical Manual 799
Note:
• If A1-02 = 4 and you do not do Rotational Auto-Tuning, control will not be stable. This can cause CF faults when you ramp to stop. If
the drive detects CF, do Rotational Auto-Tuning and Line-to-Line Resistance Tuning.
• If you input a Stop command while the motor rotates on the load side and A1-02 = 4 to use torque control, load conditions can cause
operation to not stop and can also cause CF faults. Make sure that you do Rotational Auto-Tuning and Line-to-Line Resistance Tuning
correctly and then set L8-20 = 0.
■ L8-27 OverCurr Det Gain
No.
(Hex.)
Name Description
Default
(Range)
L8-27
(04DD)
OverCurr Det Gain
Sets the PM motor overcurrent detection level as a percentage of the motor rated current value.
300.0%
(0.0 - 400.0%)
If the drive rated current is much higher than the motor rated current, PM motor magnets can demagnetize when
current flows at the drive overcurrent detection level. When the overcurrent detection level is low, adjust this
parameter to prevent motor demagnetization.
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.
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