Parameter List
11
11.9 L: Protection Functions
YASKAWA SIEPYEULA5001C LA500 Technical Manual 259
No.
(Hex.)
Name Description
Default
(Range)
Ref.
L8-05
(04B1)
Input Phase Loss
Protection Sel
Sets the function to enable and disable input phase loss detection.
0 : Disable
1 : Enabled
2 : Standard + dv/dt
Depends on o2-04
(0 - 2)
340
L8-06
(04B2)
Input Phase Loss
Detection Level
When ripple is observed in the DC bus, expansion of the input bias is calculated and
becomes the input phase if the difference between the max and minimum values of the
ripple are greater than L8-06.
Determined by o2-04
(0.0 - 50.0%)
340
L8-07
(04B3)
Expert
Output Phase Loss
Protection Sel
Sets the function to enable and disable output phase loss detection. The drive starts
output phase loss detection 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:
• The motor rated current is very small compared to the drive rating.
• The drive is operating a PM motor with a small load.
0 : Disabled
1 : Fault when one phase is lost
2 : Fault when two phases are lost
1
(0 - 2)
340
L8-09
(04B5)
Output Ground Fault
Detection
Sets the function to enable and disable ground fault protection.
0 : Disabled
1 : Enabled
1
(0, 1)
341
L8-10
(04B6)
Heatsink Fan Operation
Selection
Sets operation of the heatsink cooling fan.
0 : During Run, w/ L8-11 Off-Delay
1 : Always On
0
(0 - 1)
341
L8-11
(04B7)
Heatsink Fan Off-Delay
Time
Sets the length of time that the drive will wait before it stops the cooling fan after it
cancels the Run command when L8-10 = 0 [Heatsink Fan Operation Selection =
During Run, w/ L8-11 Off-Delay].
60 s
(0 - 300 s)
341
L8-12
(04B8)
Ambient Temperature
Setting
Sets the ambient temperature of the drive installation area.
Note:
The setting range changes when the L8-35 [Installation Method Selection] value
changes:
• 0 [IP20/UL Open Type]: -10 °C to +60 °C
• 1 [Side-by-Side Mounting]: -10 °C to +50 °C
• 2 [IP20/UL Type 1]: -10 °C to +50 °C
• 3 [Finless Installation]: -10 °C to +50 °C
40 °C
(-10 °C - +60 °C)
341
L8-15
(04BB)
Drive oL2 @ Low Speed
Protection
Sets the function to decrease the drive overload level at which the drive will trigger oL2
[Drive Overload] during low speed operation (6 Hz or slower) to prevent damage to the
main circuit transistors.
Note:
Contact Yaskawa or your nearest sales representative before disabling this function
at low speeds. If you frequently operate drives with high output current in low
speed ranges, it can cause heat stress and decrease the life span of drive IGBTs.
0 : Disabled (No Additional Derate)
1 : Enabled (Reduced oL2 Level)
1
(0, 1)
342
L8-18
(04BE)
Expert
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 : Disabled
1 : Enabled
0
(0, 1)
342
L8-19
(04BF)
Expert
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)
342
L8-35
(04EC)
Expert
Installation Method
Selection
Sets the type of drive installation.
0 : IP20/UL Open Type
1 : Side-by-Side Mounting
2 : IP20/UL Type 1
3 : Finless Installation
Determined by o2-04
(0 - 3)
342
L8-40
(04F1)
Expert
Carrier Freq Reduction
Off-Delay
Sets the length of time until the automatically reduced carrier frequency returns to the
condition before the reduction.
0.50 s
(0.00 - 2.00 s)
343
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