Parameter Details
12
12.9 L: Protection Functions
YASKAWA SIEPC71061753C GA500 Technical Manual 729
There is a delay time of 64 ms at start to build the torque limit.
◆ L8: Drive Protection
L8 parameters set protective functions that prevent faults such as overheating, phase loss, and ground faults.
■ L8-01: 3% ERF DB Resistor Protection
No.
(Hex.)
Name Description
Default
(Range)
L8-01
(04AD)
3% ERF DB Resistor
Protection
Sets the function to enable braking resistor protection with a Yaskawa ERF series braking resistor
(3% ED) installed on the heatsink.
0
(0, 1)
0 : No
Disables braking resistor protection. Use this setting for dynamic braking options that are not Yaskawa ERF series
braking resistors.
1 : Yes
Enables protection for Yaskawa ERF series braking resistors.
Note:
Set L8-01 = 1 and H2-01 to H2-03 = D [MFDO Function Select = Braking Resistor Fault]. Use a sequence to turn OFF power with
MFDO.
■ L8-02: Overheat Alarm Level
No.
(Hex.)
Name Description
Default
(Range)
L8-02
(04AE)
Overheat Alarm Level
Sets the oH detection level in temperature.
Determined by o2-04, C6-
01
(50 - 150 °C)
If the heatsink temperature is more than the temperature set in this parameter, the drive detects an overheat pre-
alarm. To enable this function, set one of H2-01 to H2-03 [MFDO Function Select] to 20 [Drive Overheat Pre-
Alarm (oH)].
If the temperature increases to the overheat fault level, the drive will trigger an oH1 [Heatsink Overheat] fault and
stop operation.
■ L8-03: Overheat Pre-Alarm Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-03
(04AF)
Overheat Pre-Alarm
Selection
Sets operation after the drive detects an oH alarm.
3
(0 - 4)
0 : Ramp to Stop
The drive ramps the motor to stop in the deceleration time. The output terminal set for Fault [H2-01 to H2-03 =
E] activates.
1 : Coast to Stop
The output turns off and the motor coasts to stop. The output terminal set for Fault [H2-01 to H2-03 = E]
activates.
2 : Fast Stop (Use C1-09)
The drive stops the motor in the deceleration time set in C1-09 [Fast Stop Time]. The output terminal set for Fault
[H2-01 to H2-03 = E] activates.
3 : Alarm Only
The keypad shows oH and the drive continues operation. The output terminal set for Alarm [H2-01 to H2-03 =
10] activates.
4 : Operate at Reduced Speed (L8-19)
The drive decelerates to the level set in L8-19 [Freq Reduction @ oH Pre-Alarm] and continues operation. oH
flashes on the keypad.
If the overheat pre-alarm is still ON after 10 s, the drive decelerates again. When the alarm is output, the drive
decelerates each 10 seconds. If the drive decelerates 10 times and the alarm continues to be output, the output
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