Parameter Details
2
2.9 L: Protection Functions
YASKAWA TOEPYAIGA5002A GA500 DRIVE PROGRAMMING 401
■ L8-19: Freq Reduction @ oH Pre-Alarm
No.
(Hex.)
Name Description
Default
(Range)
L8-19
(04BF)
Freq Reduction @ oH Pre-
Alarm
Sets the ratio at which the drive derates the frequency reference during an oH alarm.
0.8
(0.1 - 0.9)
When these two conditions are correct, this function is enabled:
• L8-03 = 4 [Overheat Pre-Alarm Ope Selection = Run@L8-19 Rate]
• oH alarm is output
■ 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 - 1000.0%)
Note:
• If the setting value for L8-27 is the same or almost the same as the setting value for L7-xx [Torque Limit], the drive can detect oC2
[Overcurrent2].
• Set L8-27 = 0.0 Hz to disable this function. Usually do not set L8-27 = 0.0.
• 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 you set a low overcurrent detection level to prevent PM motor demagnetization, make sure that you
adjust L8-27.
■ 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 [Output Current Imbalance].
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
Note:
You must set E9-01 = 1 [Motor Type Selection = Permanent Magnet (PM)] and A1-02 = 8 [EZOLV] to show L8-29.
■ 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 – 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 [Output Unbalance Detection Sel = Enabled] to enable L8-31.
• If the drive incorrectly detects LF2, increase L8-31 in 5-unit increments.
• The keypad shows L8-31 when E9-01 = 1 [Motor Type Selection = Permanent Magnet (PM)] in EZ Vector Control.
■ L8-35: Installation Method Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-35
(04EC)
Installation Method
Selection
Sets the type of drive installation.
0, 3
(0 - 3)
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