Yaskawa AC Drive P1000 Bypass Technical Manual - Manual (Page 138)

n L8-38: Carrier Frequency Reduction Selection
Selects the operation of the carrier frequency reduction function. Reduces the carrier frequency when the output current exceeds
a certain level. This temporarily increases the overload capability (oL2 detection), allowing the drive to run through transient
load peaks without tripping.
No. Name Setting Range Default
L8-38 Carrier Frequency Reduction Selection 0 to 2
Determined by
o2-04
Setting 0: Disabled
No carrier frequency reduction at high current.
Setting 1: Enabled for Output Frequencies below 6 Hz
The carrier frequency is reduced at speeds below 6 Hz when the current exceeds 100% of the drive rated current. The drive
returns to the normal carrier frequency when the current falls below 88% or the output frequency exceeds 7 Hz.
Setting 2: Enabled for Entire Frequency Range
The carrier frequency is reduced at the following speeds:
• Below 6 Hz when the current exceeds 100% of the drive rated current.
• Above 7 Hz when the current exceeds 112% of the drive rated current.
The drive uses the delay time set in parameter L8-40
<1> and a hysteresis of 12% when switching the carrier frequency back
to the set value.
<1> Details on this function can be found in the standard P1000 Technical Manual (SIEPYAIP1U01) at www.yaskawa.com.
5.8 L: Protection Functions
138 YASKAWA SIEP YAIP1B 01A YASKAWA AC Drive – P1000 Bypass Technical Manual