12.9 L: Protection Functions
734 YASKAWA SIEPC71061753C GA500 Technical Manual
Use this setting when the heatsink (cooling fin) is outside the enclosure panel or when you install a finless-type
drive.
■ L8-40: Carrier Freq Reduction Off-Delay
No.
(Hex.)
Name Description
Default
(Range)
L8-40
(04F1)
Carrier Freq Reduction Off-
Delay
Sets the length of time until the automatically reduced carrier frequency returns to the condition
before the reduction.
Determined by A1-02
(0.00 - 2.00 s)
Set L8-40 ≠ 0.00 to enable the carrier frequency reduction function during start-up. When operation starts, the
drive automatically decreases the carrier frequency. When the time set in L8-40 is expired, the carrier frequency
returns to the value set in C6-02 [Carrier Frequency Selection].
■ L8-41: High Current Alarm Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-41
(04F2)
High Current Alarm
Selection
Sets the function to cause an HCA [Current Alarm] when the output current is more than 150% of
the drive rated current.
0
(0, 1)
0 : No
The drive will not detect HCA.
1 : Yes
If the output current is more than 150% of the drive rated current, the drive will detect HCA.
The MFDO terminal set for an Alarm [H2-01 to H2-03 = 10] activates.
■ L8-51: STPo I Detection Level
No.
(Hex.)
Name Description
Default
(Range)
L8-51
(0471)
Expert
STPo I Detection Level
Sets the STPo [Motor Step-Out Detected] detection level as a percentage of the motor rated
current.
0.0%
(0.0 - 300.0%)
Note:
The detection level is automatically calculated when L8-51 = 0.
■ L8-52: STPo Integration Level
No.
(Hex.)
Name Description
Default
(Range)
L8-52
(0472)
Expert
STPo Integration Level
Sets the detection level for STPo [Motor Step-Out Detected] related to the ACR integral value.
1.0
(0.1 - 2.0)
■ L8-53: STPo Integration Time
No.
(Hex.)
Name Description
Default
(Range)
L8-53
(0473)
Expert
STPo Integration Time
Sets the length of time until the drive detects STPo after it is more than the value of L8-51 [STPo I
Detection Level].
1.0 s
(1.0 - 10.0 s)
■ L8-54: STPo Id Diff Detection
No.
(Hex.)
Name Description
Default
(Range)
L8-54
(0474)
Expert
STPo Id Diff Detection
Sets the Id deviation detection function for STPo [Motor Step-Out Detected].
1
(0, 1)
0 : Disabled
1 : Enabled
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