Parameter Details
12
12.9 L: Protection Functions
YASKAWA SIEPC71061737D GA800 Drive Technical Reference 1003
Note:
• The overcurrent detection function detects the lower of these two values:
–Drive overcurrent level
–Motor rated current × L8-27 / 100
• Set L7-xx [Torque Limit] parameters to a smaller value than the setting of L8-27.
■ L8-29: Output Unbalance Detection Sel
No.
(Hex.)
Name Description
Default
(Range)
L8-29
(04DF)
Output Unbalance Detection
Sel
Sets the function to detect LF2 [Output Current Imbalance].
1
(0, 1)
This function prevents damage to PM motors. Current unbalance can heat a PM motor and demagnetize the magnets.
When the current is unbalanced, the drive will detect LF2 to stop the motor and prevent damage to the motor.
0 : Disabled
1 : Enabled
Note:
You must set E9-01 = 1 [Motor Type Selection = Permanent Magnet (PM)] and A1-02 = 8 [EZOLV] to show L8-29.
■ 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. Change the value only in these conditions:
–Side-by-Side installation
–When you install a UL Type 1 kit on an IP20/UL Open Type drive to convert the drive to an IP20/UL Type 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 505 for information about derating
as specified by ambient temperature.
0 : IP20/UL Open Type/Ex Heatsink
Use this setting to install IP20/UL Open Type drives or when the heatsink (cooling fin) is outside 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/UL Type 1
Use this setting to install IP20/UL Type 1 drives or IP55/UL Type 12 Heatsink External Mounting drives.
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