RX Quick Start Guide
32 RX 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 commutation speed that is used to gener-
ated 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 automatic carrier frequency reduction on parameter b089 could reduce
the selected value when the output current increase. On this way is possible
to have a high carrier frequency with light loads and avoid the current
derating when the load increase. The upper limit is defined by b083 while
the lower one is 3KHz with 2KHz per second reduction rate. When the
output current falls below -5% of each level, the function will be reset.
3.20 PID function
When enabled, the built-in PID loop calculates an ideal inverter output value that cause the loop feedback process variable (PV)
to move closer to the set point value (SP). The frequency command is used as SP and the PID loop algorithm will read the analog
input for the process variable and calculate the proper inverter output to reach it
Parameter Parameter name Description
b012 Electronic thermal level 0.20 x Rated current to 1.00 x Rated current
b013 Electronic thermal characteristics selection 00: Reduced TRQ (Reduced torque characteristics)
01: Const TRQ (Constant torque characteristics)
02: Free set (Free setting)
b015 Free setting electronic thermal frequency 1 0 to 400 Hz
b016 Free setting electronic thermal current 1 0.0 to Rated current
b017 Free setting electronic thermal frequency 2 0 to 400 Hz
b018 Free setting electronic thermal current 2 0.0 to Rated current
b019 Free setting electronic thermal frequency 3 0 to 400 Hz
b020 Free setting electronic thermal current 3 0.0 to Rated current
Parameter Parameter name Description
b083 Carrier frequency 0.5 to 15.0 kHz (0.4 to 55 kW)
0.5 to 10.0 kHz (75 to 132 kW)
b089 Automatic carrier reduction 00: OFF (Disabled)
01: ON (Enabled)
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
10050
0
3kHz
6kHz
9kHz
12kHz
15kHz
96%84%72%60%
Carrier freq.
Output current
5%
5%
5%
5%
Setpoint
SP
+
PID
Calculation
Error Freq.
Inverter Motor
External
Process
Sensor
Process Variable (PV)
PV
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