L8: Drive Protection - YASKAWA GA700 Technical Manual

11.9 L: Protection Function
• Acceleration and deceleration times take longer.
• Motor speed does not reach the frequency reference value during run at constant speed.
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L7-16: Torque Limit Process at Start
No.
Name
(Hex.)
L7-16 Torque Limit Process
at Start
(044D)
0 : Disabled
Torque limit is created at start without a delay time.
Disable this setting to maximize the response time when the application requires sudden acceleration or
deceleration at start.
1 : Enabled
A delay time of 64 ms is added to allow the torque limit to build at start.
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L7-35: Regeneration Torque Limit during Low Frequency Operation
No.
Name
(Hex.)
L7-35 DeratingTrqLimFor
LowFreq&Regratn
(1B57)
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 [Ope Freq Band for Derating Trq Lim Torque Limit]. Torque limits are not reduced
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 10.00% and reduce the setting value of L7-36 in increments of 2.00 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
TorqueLimit] or L7-04 [Reverse Regenerative TorqueLimit].
• 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.
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L7-36: Ope Freq band for deratingTrqLim
No.
Name
(Hex.)
L7-36 Ope Freq band for
deratingTrqLim
(1B58)
Increase the setting value when oC [Overcurrent] faults are detected while regenerative loads are connected at
low speed. Reduces the torque limit in accordance with the setting of L7-35 within a range of 0 ≤ output
frequency < L7-36. When the torque limit gradually changes in accordance with the output frequency until the
output frequency = L7-36, the value explicitly changes to the settings of L7-03 [Forward Regenerative
TorqueLimit] and L7-04 [Reverse Regenerative TorqueLimit].
Note:
The motor rotates faster than the reference speed when a regenerative load is input while L7-36 is set to a large value. Do not set the
value any higher than necessary.
◆

L8: Drive Protection

L8 parameters set protective functions that prevent faults such as overheating, phase loss, and ground faults.
864
V/f CL-V/f OLV CLV AOLV
Assigns a time filter to allow the torque limit to build at start.
V/f CL-V/f OLV CLV AOLV
Sets the torque limit used during low-speed regeneration. Normally there is
no need to change this setting.
V/f CL-V/f OLV CLV AOLV
Sets the frequency width at which L7-35 [Derating Trq Lim For Low Freq
& Regeneration] operates.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default
(Range)
1
(0, 1)
Default Setting
(Range)
50.00%
(0.00 - 200.00%)
Default Setting
(Range)
6.00 Hz
(0.00 - 30.00 Hz)