Parameter Details
12
12.9 L: Protection Functions
YASKAWA SIEPC71061737B GA800 Drive Technical Reference 945
■ L8-31: LF2 Detection Time
No.
(Hex.)
Name Description
Default
(Range)
L8-31
(04E1)
LF2 Detection Time
Sets the LF2 [Output Current Imbalance] detection time.
3
(1 – 100)
When the output current is unbalanced for longer than the time set in L8-31, the drive detects LF2.
Note:
• Set L8-29 = 1 [Output Unbalance Detection Sel = Enabled] to enable L8-31.
• If the drive incorrectly detects LF2, increase L8-31 in 5-unit increments.
• The keypad shows L8-31 when E9-01 = 1 [Motor Type Selection = Permanent Magnet (PM)] in EZ Vector Control.
■ L8-35: Installation Method Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-35
(04EC)
Installation Method
Selection
Sets the type of drive installation.
Determined by the drive
(0 - 3)
Note:
• Parameter A1-03 [Initialize Parameters] does not initialize this parameter.
• This parameter is set to the correct value when the drive is shipped. Side-by-Side installation
–Change the value only in these conditions:
–When you install a UL Type 1 kit on an IP20/UL Open Type drive to convert the drive to an IP20/ULType 1 drive.
The overload protection detection level for the drive is automatically adjusted to the optimal value in accordance with
the setting value. Refer to Derating Depending on Ambient Temperature on page 450 for information on derating
depending on ambient temperature.
0 : IP20/OpenChassis Enc/Ex Heatsink
Use this setting to install an IP20/UL Open Type drive or when the heatsink (cooling fin) is outside of the enclosure
panel.
Make sure that there is 30 mm (1.18 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/NEMA Type 1/IP55
Use this setting to install IP20/UL Type 1 drives or IP55/UL Type 12 Heatsink External Mounting drives.
3 : Finless
Use this setting to install a finless drive (no heatsink).
■ 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 reduces the carrier frequency when the
output current is more than a specified level.
Determined by A1-02, C6-
01 and o2-04
(0 - 2)
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.
0 : Disabled
The drive will not decrease the carrier frequency at high current.
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.
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