Parameter Details
11
11.9 L: Protection Functions
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 981
Note:
Contact Yaskawa or your nearest sales representative for consultation before disabling this function at low speeds. Frequent operation of
drives under conditions of high output current in low speed ranges may shorten the service life of the drive IGBT due to heat stress.
0 : Disabled (No Additional Derate)
The drive does not decrease the overload protection level.
1 : Enabled (Reduced oL2 Level)
When the drive detects oL2 during low speed operation, it automatically decreases the overload detection level.
At zero speed, the drive derates the overload by 50%.
■ L8-18: Software Current Limit Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-18
(04BE)
Software Current
Limit Selection
Set the software current limit selection function to prevent damage to the
main circuit transistor caused by too much current.
0
(0, 1)
0 : Disabled
When the output current is at the software current limit value, the drive does not restrict the output voltage.
Note:
The drive may detect an oC [Overcurrent] when loads are particularly heavy or the acceleration time is particularly short.
1 : Enabled
When the output current is at the software current limit value, the drive decreases output voltage to decrease
output current.
When the output current decreases to the software current limit level, the drive starts usual operation.
■ L8-19: Freq Reduction @ oH Pre-Alarm
No.
(Hex.)
Name Description
Default
(Range)
L8-19
(04BF)
Freq Reduction @ oH
Pre-Alarm
Sets the ratio at which the drive derates the frequency reference when
during an oH alarm.
0.8
(0.1 to 0.9)
When these two conditions are correct, this function is enabled:
• L8-03 = 4 [Overheat Pre-Alarm Ope Selection = Run@L8-19 Rate]
• oH alarm is output
■ L8-20: Control Fault & Step Out Detect
No.
(Hex.)
Name Description
Default
(Range)
L8-20
(04C0)
Expert
Control Fault & Step
Out Detect
Sets operation after the drive detects a CF fault when A1-02 = 4 [Control
Method Selection = Advanced Open Loop Vector].
1
(0 - 2)
If you enter a Stop command but it cannot stop drive operation, the drive will detect CF.
0 : Disabled
1 : CF/STPo Detection Enabled
2 : CF ALM/Stop
The drive stops DC injection braking as specified by the value of b2-03 [DC Inject Braking Time at Start].
Note:
• If A1-02 = 4 and you do not do Rotational Auto-Tuning, control will not be stable. This can cause CF faults when you ramp to stop. If
the drive detects CF, do Rotational Auto-Tuning and Line-to-Line Resistance Tuning.
• If you input a Stop command while the motor rotates on the load side and A1-02 = 4 to use torque control, load conditions can cause
operation to not stop and can also cause CF faults. Make sure that you do Rotational Auto-Tuning and Line-to-Line Resistance Tuning
correctly and then set L8-20 = 0.
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