Parameter Details
12
12.9 L: Protection Functions
YASKAWA SIEPC71061705H GA700 Series Technical Manual 909
■ L7-36: Regen Torque Limit Derate Freq
No.
(Hex.)
Name Description
Default
(Range)
L7-36
(1B58)
Expert
Regen Torque Limit Derate
Freq
Sets the frequency width at which L7-35 [Low Freq Regen Torque Limit Lvl] operates.
6.0 Hz
(0.0 - 30.0 Hz)
If the drive detects oC [Overcurrent] faults when you connect regenerative loads at low speed, increase the setting
value. Decreases the torque limit as specified by the setting of L7-35 in a range of 0 ≤ output frequency < L7-36.
When the torque limit gradually changes as specified by the output frequency until the output frequency = L7-36,
the value changes to the setting of L7-03 [Forward Regenerative Trq Limit] and L7-04 [Reverse Regenerative Trq
Limit].
Note:
If you increase the setting of L7-36, the motor will rotate at a speed higher than specified when a you input a regenerative load. 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 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 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 the operation of drives when an oH alarm is detected.
3
(0 - 4)
0 : Ramp to Stop
The drive ramps the motor to stop in the deceleration time. Fault relay output terminal MA-MC turns ON, and
MB-MC turns OFF.
1 : Coast to Stop
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