YASKAWA GA700 Technical Manual page 868

11.9 L: Protection Function
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
The overload protection level is not reduced.
1 : Enabled
The overload protection level is automatically reduced when oL2 is detected during low speed operation.
At zero speed, the overload is derated by 50%.
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L8-18: Software Current Limit Selection
No.
Name
(Hex.)
L8-18 Software Current
Limit Selection
(04BE)
0 : Disabled
The output voltage is not limited when the output current reaches the software current limit value.
Note:
The drive may detect an oC [Overcurrent] when loads are particularly heavy or the acceleration time is particularly short.
1 : Enabled
The drive reduces output voltage to reduce output current when the output current reaches the software current
limit value.
The drive starts normal operation when the output current lowers to the software current limit level.
■
L8-19: FreqReductRateDuringOH Pre-Alarm
No.
Name
(Hex.)
L8-19 FreqReductRateDurin
gOH Pre-Alarm
(04BF)
Enabled when both of the following conditions are satisfied.
• L8-03 = 4 [Overheat Pre-Alarm Ope Selection = Run@L8-19 Rate] is set
• oH alarm is output
■
L8-20: CF/STPo Fault Detection Select
No.
Name
(Hex.)
L8-20 CF SELECT
(04C0)
CF is detected when the state in which operation cannot be stopped continues even though the stop command has
been input.
0 : Detection disabled
1 : Detects CF [Control Fault], and then the drive coasts to stop.
2 : Detects CF [Control Fault], and then the drive stops DC injection braking.
The DC injection braking is stopped in accordance with the setting value of b2-03 [DC Inject Braking Time at
Start].
Note:
• Control is unstable if the Rotational Auto-Tuning process is not executed when A1-02 = 4. In such cases, CF issues may be detected
when ramping to stop. If a CF fault is detected, check whether or not the Rotational Auto-Tuning process was executed. In addition,
perform the Line-to-Line Resistance Tuning process.
• Depending on load conditions, operation may not stop and CF issues may be detected if the stop command is input while the motor is
rotating on the load side while using torque control via a setting of A1-02 = 4. Confirm that the Rotational Auto-Tuning and Line-to-
Line Resistance Tuning processes were performed correctly and then set L8-20 = 0.
868
V/f CL-V/f OLV CLV AOLV
Enables or disables the software current limit selection used to protect the
main circuit transistor from significant current.
V/f CL-V/f OLV CLV AOLV
Sets the ratio at which the frequency reference is derated when the oH alarm
is output.
V/f CL-V/f OLV CLV AOLV
Selects the operation when CF faults are detectedwhen A1-02 = 4 [Control
Method Selection = Advanced OpenLoop Vector Control].
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 Setting
(Range)
0
(0, 1)
Default
(Range)
0.8
(0.1 to 0.9)
Default Setting
(Range)
1
(0 - 2)