Hitachi SJ Series, User Manual

Page: 305 / 786

12-12-2
Chapter 12
Inverter Function
12.12.2 Automatically lowering carrier
frequency
• I want to lower the carrier frequency automatically
according to the current flowing to the inverter
output.
• I want to lower the carrier frequency automatically
according to the inverter temperature.
• 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
lowering the carrier frequency automatically
according to the output current or temperature.
Parameters
• 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 s.
• When the automatic carrier frequency reduction
function is activated, the electromagnetic noise
generated by the motor changes slowly.
Item Parameter Data Description
Automatic carrier
frequency
reduction
selection
[bb103]
00 [bb101] Follows the carrier frequency.
01
Reduces the carrier frequency according to the inverter output
current.
02
Reduces the carrier frequency according to the inverter
temperature.
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