10.11 L: Protection Functions
518 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
◆ L7: Torque Limit
No.
(Hex.)
Name Description
Default
(Range)
Ref.
L7-01
(04A7)
RUN
Forward Torque Limit
Sets the torque limit value for forward motoring as a percentage, where motor rated
torque is the 100% value.
200%
(0 - 300%)
760
L7-02
(04A8)
RUN
Reverse Torque Limit
Sets the torque limit value for reversed motoring as a percentage, where motor rated
torque is the 100% value.
200%
(0 - 300%)
760
L7-03
(04A9)
RUN
Forward Regenerative
Trq Limit
Sets the torque limit value for forward regenerative conditions as a percentage of the
motor rated torque.
200%
(0 - 300%)
760
L7-04
(04AA)
RUN
Reverse Regenerative
Trq Limit
Sets the torque limit value for reversed regenerative conditions as a percentage of the
motor rated torque.
200%
(0 - 300%)
760
L7-06
(04AC)
Torque Limit Integral
Time
Sets the integral time constant for the torque limit function.
200 ms
(5 - 10000 ms)
761
L7-07
(04C9)
Torque Limit during
Accel/Decel
Sets the torque limit function during acceleration and deceleration.
0 : Proportional only
1 : Proportional & Integral control
0
(0, 1)
761
L7-16
(044D)
Torque Limit Process at
Start
Assigns a time filter to allow the torque limit to build at start.
0 : Disabled
1 : Enabled
1
(0, 1)
761
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.
50.0%
(0.0 - 200.0%)
761
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)
762
◆ L8: Hardware Protection
No.
(Hex.)
Name Description
Default
(Range)
Ref.
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).
0 : Disable
1 : Enabled
0
(0, 1)
762
L8-02
(04AE)
Overheat Alarm Level
Sets the oH detection level in temperature.
Determined by o2-04
(50 - 150 °C)
762
L8-03
(04AF)
Overheat Pre-Alarm
Selection
Sets operation after the drive detects an oH alarm.
0 : Ramp to Stop
1 : Coast to Stop
2 : Fast Stop (Use C1-09)
3 : Alarm Only
4 : Operate at Reduced Speed (L8-19)
3
(0 - 4)
762
L8-05
(04B1)
Input Phase Loss
Protection Sel
Sets the function to enable and disable input phase loss detection.
0 : Disable
1 : Enabled
1
(0, 1)
763
L8-07
(04B3)
Output Phase Loss
Protection Sel
Sets the function to enable and disable output phase loss detection. The drive starts
output phase loss detection and the motor coasts to stop when the output current
decreases to less than 5% of the drive rated current.
Note:
The drive can incorrectly start output phase loss detection in these conditions:
Disable output phase loss protection.
• The motor rated current is very small compared to the drive rating.
0 : Disable
1 : Fault when one phase is lost
2 : Fault when two phases are lost
1
(0 - 2)
764
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