12.9 L: Protection Functions
998 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
Reduces the regenerative torque limit to the level set with L7-35 when using low frequencies such that the output
frequency is less than L7-36 [Regen Torque Limit Derate Freq]. The drive does not decrease torque limits during
ramp to stop operation. Decrease the setting of L7-35 when oC [Overcurrent] issues occur while a regenerative load
is input and the speed reference is constant.
Note:
• Reduce the setting value of L7-35 in increments of 10.0% and reduce the setting value of L7-36 in increments of 2.0 Hz when faults occur
during regenerative loads at low speed.
• Setting values that are too high can cause faults.
• The torque limit reduction function does not operate when L7-35 is set with a value larger than L7-03 [Forward Regenerative Trq Limit] or
L7-04 [Reverse Regenerative Trq Limit].
• The motor may rotate slightly faster than the reference when a regenerative load is input at low speeds while L7-35 is set to a low value.
■ 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.
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