12.9 L: Protection Functions
1002 YASKAWA SIEPC71061737D GA800 Drive Technical Reference
■ 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 during an oH alarm.
0.8
(0.1 - 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:
• When A1-02 = 4, control will not be stable if you do not do Rotational Auto-Tuning. This can cause CF faults if you ramp to stop. If the
drive detects CF, do Rotational Auto-Tuning and Line-to-Line Resistance Tuning. Also, do Line-to-Line Resistance Tuning.
• If you set A1-02 = 4 and set these parameters, the drive can detect CF because it cannot stop the operation in some load conditions. Make
sure that you do Rotational Auto-Tuning and Line-to-Line Resistance Tuning correctly and then set L8-20 = 0.
–d5-01 = 1 [Torque Control Selection = Torque Control]
–L3-11 = 1 [Overvoltage Suppression Select = Enabled]
–Decreased L7-01 to L7-04 [Torque Limit].
■ L8-27: Overcurrent Detection Gain
No.
(Hex.)
Name Description
Default
(Range)
L8-27
(04DD)
Overcurrent Detection Gain
Sets the PM motor overcurrent detection level as a percentage of the motor rated current value.
300.0%
(0.0 - 1000.0%)
To Next Page
Loading...
