Automatic Carrier Reduction - Omron RX2 Series User Manual

7 Advanced Settings
 Parameter
Item
Carrier speed set-
ting, 1st-motor
*1. The following constraints will be applied internally.
Maximum 12.0 kHz at rated LD, maximum 10.0 kHz at rated VLD
7-4-2

Automatic Carrier Reduction

It automatically lowers the carrier frequency according to increase of output current values and tem-
perature rise in inverter.
The automatic carrier frequency reduction selection can be changed using the [bb103] setting.
The higher the inverter carrier frequency is, the more the temperature inside the inverter tends to
increase.
The Automatic carrier frequency reduction function reduces life degradation of the elements by auto-
matically lowering the carrier frequency according to the output current or temperature.
Precautions for Correct Use
• When the automatic carrier frequency reduction function is activated, the electromagnetic
noise of the motor changes.
• If the carrier frequency [bb101] is 2.0 kHz or lower, this function will not be activated.
• The operation rate when the carrier frequency was changed during operation will be 2 kHz in
1 second.
• When the automatic carrier frequency reduction function is activated, the electromagnetic
noise generated by the motor changes slowly.
• The [bb102] setting is not necessary when synchronous motor and permanent magnet motor
are used.
 Parameter
Item
Automatic-carrier
reduction
selection,
1st-motor
7 - 60
Parameter Data
[bb101]
0.5 to 16.0(kHz)
Parameter Data
00
01
[bb103]
02
High-function General-purpose Inverter RX2 Series User's Manual
Description
*1
Changes the carrier frequency.
Description
[bb101] Follows the carrier frequency.
Reduces the carrier frequency according to the
inverter output current.
Reduces the carrier frequency according to the
inverter temperature.
Default
data
2.0
Default
data
00