Parameter Details
5
5.8 L: Protection Functions
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference 345
When the output current decreases to the software current limit level, the drive starts usual operation.
â– 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. 20.0%
(10.0 - 100.0%)
When L8-03 = 4 [Overheat Pre-Alarm Selection = Operate at Reduced Speed (L8-19)] and an oH alarm is output,
this function is enabled.
â– L8-35: Installation Method Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-35
(04EC)
Installation Method
Selection
Sets the type of drive installation. 2
(0 - 3)
Note:
• Parameter A1-03 [Initialize Parameters] does not initialize this parameter.
• This parameter is set to the correct value from the factory.
• The drive will detect an oPE02 [Parameter Range Setting Error] in these conditions:
–If you set L8-12 = 60 °C and L8-35 = 1 or 3 on enclosures with drive models 2011 to 2114 and 4005 to 4124
–If you set L8-35 = 1 or 3 on enclosures with drive models 2143 to 2273 and 4156 to 4302
The drive automatically adjusts the overload protection detection level to the best value as specified by the setting
value. Refer to Derating Depending on Ambient Temperature on page 544 for information on derating depending on
ambient temperature.
0 : IP20/UL Open Type
Use this setting to install an IP20/UL Open Type drive.
Make sure that there is 60 mm (2.4 in) minimum of space between drives or between the drive and side of the
enclosure panel.
1 : Side-by-Side Mounting
Use this setting to install more than one drive Side-by-Side.
Make sure that there is 2 mm (0.08 in) minimum of space between drives.
2 : IP20/UL Type 1
Use this setting to install an IP20/UL Type 1 drive.
3 : IP55/UL Type 12
Use this setting to install an IP55/UL Type 12 drive.
â– L8-38: Carrier Frequency Reduction
No.
(Hex.)
Name Description
Default
(Range)
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.
Determined by o2-04
(1 - 3)
If you decrease the carrier frequency, it increases the overload tolerance. The overload capacity increases temporarily
for oL2 [Drive Overloaded] and lets the drive operate through transient load peaks and not trip.
1 : Enabled below 6 Hz
The drive decreases the carrier frequency at speeds less than 6 Hz when the current is more than 100% of the drive
rated current.
When the current is less than 88% or the output frequency is more than 7 Hz, the drive goes back to the usual carrier
frequency.
2 : Enabled for All Speeds
The drive decreases the carrier frequency at these speeds:
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