11.9 L: Protection Functions
978 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
■ 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 : Disabled
Disables braking resistor protection. Use this setting for dynamic braking options that are not Yaskawa ERF series
braking resistors.
1 : Enabled
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.
Determined by o2-04
and 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 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)
The drive uses the deceleration time set in C1-09 [Fast Stop Time] to stop the motor. Fault relay output terminal
MA-MC will activate, and MB-MC will deactivate.
3 : Alarm Only
oH is shown on the keypad and operation continues. 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.
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 oH alarm continues for 10 seconds, 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 terminal set for oH Pre-Alarm Reduction Limit [H2-01 to H2-03 = 4D] activates. When the
alarm is not output during deceleration, the drive accelerates until it is at the frequency reference that was
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