Parameter Details
2
2.9 L: Protection Functions
YASKAWA TOEPYAIGA8002B GA800 Drive Programming 479
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
■ L8-20: Control Fault & Step Out Detect
No.
(Hex.)
Name Description
Default
(Range)
L8-20
(04C0)
Expert
Control Fault & Step Out
Detect
Sets operation after the drive detects a CF fault when A1-02 = 4 [Control Method Selection =
Advanced Open Loop Vector].
1
(0 - 2)
If you enter a Stop command but it cannot stop drive operation, the drive will detect CF.
0 : Disabled
1 : CF/STPo Detection Enabled
2 : CF ALM/Stop
The drive stops DC injection braking as specified by the value of b2-03 [DC Inject Braking Time at Start].
Note:
• When A1-02 = 4, control will not be stable if you do not do Rotational Auto-Tuning. This can cause CF faults if you ramp to stop. If the
drive detects CF, do Rotational Auto-Tuning and Line-to-Line Resistance Tuning. Also, do Line-to-Line Resistance Tuning.
• If you set A1-02 = 4 and set these parameters, the drive can detect CF because it cannot stop the operation in some load conditions. Make
sure that you do Rotational Auto-Tuning and Line-to-Line Resistance Tuning correctly and then set L8-20 = 0.
–d5-01 = 1 [Torque Control Selection = Torque Control]
–L3-11 = 1 [Overvoltage Suppression Select = Enabled]
–Decreased L7-01 to L7-04 [Torque Limit].
■ 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:
• The overcurrent detection function detects the lower of these two values:
–Drive overcurrent level
–Motor rated current × L8-27 / 100
• Set L7-xx [Torque Limit] parameters < L8-27.
• When you set L8-27 = 0.0, it disables this function. In usual conditions, 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 if current flows at the drive overcurrent detection level.
■ 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 – 100)
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