Parameter Details
11
11.9 L: Protection Functions
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 977
■ L7-16: Torque Limit Process at Start
No.
(Hex.)
Name Description
Default
(Range)
L7-16
(044D)
Torque Limit Process
at Start
Assigns a time filter to allow the torque limit to build at start.
1
(0, 1)
0 : Disabled
There is torque limit at start without a delay time.
Use this setting to maximize the response time when sudden acceleration or deceleration at start is necessary.
1 : Enabled
There is a delay time of 64 ms at start to build the torque limit.
■ L7-35: Low Freq Regen Torque Limit Lvl
No.
(Hex.)
Name Description
Default
(Range)
L7-35
(1B57)
Expert
Low Freq Regen
Torque Limit Lvl
Sets the torque limit used during low-speed regeneration. Usually it is not
necessary to change this setting.
50.00%
(0.00 - 200.00%)
Decreases the regenerative torque limit to the level set in L7-35 when you use a low frequency and the output
frequency is less than L7-36 [Ope Freq Band for Derating Trq Lim Torque Limit]. The drive does not decrease
torque limits during ramp to stop operation. If the drive detects oC [Overcurrent] when you input a regenerative
load and the speed reference is constant, decrease this parameter.
Note:
• If the drive detects faults during regenerative loads at low speed, decrease this parameter in 10.00% increments and decrease the setting
of L7-36in 2.00 Hz increments.
• Setting values that are too high can cause faults.
• If you set this parameter > L7-03 [Forward Regenerative TorqueLimit] or L7-04 [Reverse Regenerative TorqueLimit], the torque limit
reduction function will not operate.
• If you input a regenerative load at low speeds and set this parameter to a small value, it can cause the motor to rotate faster than the
speed reference.
■ 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.
6.00 Hz
(0.00 - 30.00 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 settings of L7-03 [Forward Regenerative TorqueLimit] and L7-04 [Reverse Regenerative
TorqueLimit].
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.
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