11.9 L: Protection Functions
982 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
■ L8-27: Overcurrent Detection Gain
No.
(Hex.)
Name Description
Default
(Range)
L8-27
(04DD)
Overcurrent
Detection 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-xx [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: Output Unbalance Detection Sel
No.
(Hex.)
Name Description
Default
(Range)
L8-29
(04DF)
Output Unbalance
Detection Sel
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 Detection Time
No.
(Hex.)
Name Description
Default
(Range)
L8-31
(04E1)
LF2 Detection 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 [Current Unbalance Detect (LF2) = Enabled] to enable this parameter.
• If the drive detects LF2 by error, increase the setting value of L8-31 in 5-unit increments.
• The operator shows this parameter when E9-01 = 1 [Motor Type Selection = PM] under EZ Open Loop Vector Control.
■ L8-32: Cooling Fan Failure Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-32
(04E2)
Cooling Fan Failure
Selection
Sets operation when the drive detects FAn [Internal Agitating Fan Fault].
1
(0 - 4)
0 : Ramp to Stop
The drive ramps to stop in the selected deceleration time. Fault relay output terminal MA-MC will activate, and
MB-MC will deactivate.
1 : Coast to Stop
The drive output shuts off and the motor coasts to stop. Fault relay output terminal MA-MC will activate, and
MB-MC will deactivate.
2 : Fast Stop (Use C1-09)
To Next Page
Loading...
