Parameter Details
12
12.9 L: Protection Functions
YASKAWA SIEPC71061705H GA700 Series Technical Manual 915
■ 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.
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:
• Output current is a minimum of 100% of the drive rated current and the frequency reference is less than 6 Hz.
• Output current is a minimum of 109% of the drive rated current, the drive is in Normal Duty mode, and the
frequency reference is 7 Hz or more.
• Output current is a minimum of 112% of the drive rated current, the drive is in Heavy Duty mode, and the
frequency reference is 7 Hz or more.
When the drive switches the carrier frequency to the set value, it uses the delay time set in L8-40
[CarrierFreqReduct Off DelayTime] and a hysteresis of 12%.
■ 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 : Disabled
The drive will not detect HCA [Current Alarm].
1 : Enabled
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.
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