Omron 3G3MX2 - Carrier Frequency (PWM)

MX2 Quick Start Guide
32 MX2 Quick Start Guide
b013 could be used to match the torque characteristic with the load. Output current on the winding is used for this calculation as
is proportional to the torque generated by the motor. That’s why the current level has to be set in parameter b012 with a range
that goes from 20 to 100% of the inverter rated current.
3.19 Carrier frequency (PWM)
The internal switching frequency of the inverter circuitry (also called chop-
per frequency) defines the IGBT communtation speed that is used to gen-
erated the output frequency. Is adjustable from 2.0 to 15KHz (depending
on the inverter size) where the audible noise decrease at higher frequencies
while the RFI noise and leakage current increase.
The carrier frequency is adjusted by parameter b083 but the activation of
the aumatic carrier frequency reduction on parameter b089 could reduce
the selected value when the output current increase or when the heat sink
temperature is too high. On this way is possible to have a high carrier fre-
quency with light loads and avoid the derating when the load increase. The
upper limit is defined by b083 while the lower one is 3KHz with 2KHz per
second reduction rate.
Parameter Parameter name Description
b012 Level of electronic thermal Set a level between 20% and 100% for the rated inverter current.
b013 Electronic thermal characteristic Select from three curves, option codes:
00... Reduced torque
01... Constant torque
02... Free setting
b015 Free setting electronic thermal ~freq.1 Range is 0 to 400 Hz
b016 Free setting electronic thermal ~current1 Range is 0 to inverter rated current Amps
b017 Free setting electronic thermal ~freq.2 Range is 0 to 400 Hz
b018 Free setting electronic thermal ~current2 Range is 0 to inverter rated current Amps
b019 Free setting electronic thermal ~freq.3 Range is 0 to 400 Hz
b020 Free setting electronic thermal ~current3 Range is 0 to inverter rated current Amps
Parameter Parameter name Description
b083 Carrier frequency Sets the PWM carrier (internal switching frequency), range is
2.0 to 15.0 kHz
b089 Automatic carrier frequency reduction Three option codes:
00 Disabled
01 Enabled, depending on the output current
02 Enabled, depending on the heat-sink temperature
Reduction rate
Output frequency [Hz]
b012 x 1.0
5
16
50
b012 x 0.8
b012 x 0.6
0
Base FQ
Reduction rate
Output frequency [Hz]
b012 x 1.0
b012 x 0.8
3
60
0
Reduction rate
b012 x 1.0
b012 x 0.8
b015
b019
0
Setting range
Output frequency [Hz]
Reduced Torque (b013=00) Constant Torque (b013=01) Free setting (b013=02)
b017
b016
b018
b020
00105
0
3kHz
6kHz
9kHz
12kHz
15kHz
96%84%72%60%
Carrier freq.
Output current
5%
5%
5%
5%
I129E-EN-02+MX2+QuickStartGuide.book Seite 32 Mittwoch, 7. November 2012 1:54 13