12.8 L: PROTECTION
774 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Note:
If you input a regenerative load at low speeds and set this parameter to a large value, it can cause the motor to rotate faster than the
speed reference. Do not set the value higher than necessary.
◆ L8: DRIVE PROTECTION
L8 parameters set protective functions that prevent faults such as overheating, phase loss, and ground faults.
■ L8-01 3%ERF DBR Protection
No.
(Hex.)
Name Description
Default
(Range)
L8-01
(04AD)
3%ERF DBR 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 = 4C [DO Function Select = BrkRes Fault]. Use a sequence to turn OFF power with MFDO.
■ L8-02 Overheat Alm Level
No.
(Hex.)
Name Description
Default
(Range)
L8-02
(04AE)
Overheat Alm 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 [DO Function Select] to 4E [Drive PreOH].
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->Stop
The drive ramps to stop in the selected deceleration time. Fault relay output terminal 1NO-1CM will activate, and
1NC-1CM will deactivate.
1 : Coast->Stop
The drive output shuts off and the motor coasts to stop. Fault relay output terminal 1NO-1CM will activate, and
1NC-1CM will deactivate.
2 : Fast Stop (C1-09)
The drive uses the deceleration time set in C1-09 [Fast Stop Time] to stop the motor. Fault relay output terminal
1NO-1CM will activate, and 1NC-1CM 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 = 4]
activates.
4 : Run@L8-19 Rate
The drive decelerates to the level set in L8-19 [Frq Reduct@oHPre-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
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