9.11 L: Protection Functions
638 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
No.
(Hex.)
Name Description
Default
(Range)
Ref.
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 when the output current decreases to less than 5% of the drive rated
current.
Note:
The drive can incorrectly start output phase loss detection when te motor rated current
is very small compared to the drive rating.
0 : Disabled
1 : Fault when one phase is lost
2 : Fault when two phases are lost
1 343
L8-09
(04B5)
Output Ground Fault
Detection
Sets the function to enable and disable ground fault protection.
0 : Disabled
1 : Enabled
Determined by o2-04
(0, 1)
343
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
2 : On when Drive Temp Reaches L8-64
0
(0 - 2)
343
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].
300 s
(0 - 300 s)
344
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] setting
changes.
• When L8-35 = 0 or 2 [IP20/UL Open Type or IP20/UL Type 1]: -10 °C～+60 °C
• When L8-35 = 1 or 3 [Side-by-Side Mounting or IP55/UL Type 12]: -10 °C～+50 °C
40 °C
(Determined by L8-35)
344
L8-15
(04BB)
Drive oL2 @ Low Speed
Protection
Sets the function to decrease drive overload at low speeds to prevent damage to the main
circuit transistor during low speed operation (at 6 Hz or slower) to prevent oL2 [Drive
Overloaded].
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)
344
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 : Disabled
1 : Enabled
0
(0, 1)
344
L8-19
(04BF)
Freq Reduction @ oH
Pre-Alarm
Sets the ratio at which the drive derates the frequency reference during an oH alarm. 20.0%
(10.0 - 100.0%)
345
L8-35
(04EC)
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 : IP55/UL Type 12
2
(0 - 3)
345
L8-38
(04EF)
Carrier Frequency
Reduction
Sets the carrier frequency reduction function. The drive decreases the carrier frequency
when the output current is more than a specified level.
1 : Enabled below 6 Hz
2 : Enabled for All Speeds
3 : Enable at Overload
Determined by o2-04
(1 - 3)
345
L8-41
(04F2)
High Current Alarm
Selection
Sets the function to cause an HCA [High Current Alarm] when the output current is more
than 150% of the drive rated current.
0 : Disabled
1 : Enabled
0
(0, 1)
346
L8-97
(3104)
Carrier Freq Reduce
during OH
Sets the function to decrease carrier frequency during oH pre-alarm.
0 : Disabled
1 : Enabled
0
(0, 1)
346
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