48
Commander SE Advanced User Guide
Issue Number: 4
This parameter is used to select the required switching frequency.
12kHz is not available on SE size 5.
Intelligent Thermal Management
The Commander SE contains a heatsink thermistor that monitors the temperature of the drive’s heatsink. If the switching
frequency is set above 3kHz and the heatsink temperature increases above set levels, the drive will reduce the switching
frequency in order to prevent the drive from tripping on heatsink over-temperature (Oht2). If the switching frequency is set to
3kHz and the heatsink temperature increases above the maximum allowable level, the drive will trip on Oht2.
The drive also contains a software thermal model that calculates the IGBT power semiconductor junction temperatures. This
temperature will be greater than the thermistor temperature especially under thermal shock conditions because of drive
thermal impedances and the heatsink thermal mass. If the switching frequency is set above 3kHz and the thermal model
calculates an IGBT junction temperature above a set level, the drive will reduce the switching frequency in order to prevent
the drive from tripping on thermal model over-temperature, Oht1. If the switching frequency is set to 3kHz and the calculated
IGBT junction temperature increases above the maximum allowable level, the drive will trip on Oht1.
If the drive’s thermal model reduces the switching frequency in order to prevent the drive from tripping, the drive’s right hand
display will alternately flash between the units it is currently displaying and ‘hot’.
Normally the drive will use space vector modulation to produce the IGBT control signals. High stability space vector
modulation offers three advantages in an open loop drive, but the acoustic noise produced by the machine may increase
slightly.
•
It is possible for instability to occur around motor rated frequency/2 on light load. To prevent this, high stability space
vector modulation should be enabled by setting this parameter.
•
As the output voltage approaches the maximum available from the drive, pulse deletion occurs. This can cause unstable
operation with a lightly or fully loaded machine. High stability space vector modulation will reduce this effect.
•
High stability space vector modulation gives a small reduction in drive heat loss.
High stability space vector modulation is not available on the Commander SE Size 1.
5.18
PWM switching frequency selector
Ú
3, 6, 12 (0 ~ 2)
Ö
Size 1to4: (1) 6
Size 5: (0) 3
kHz
RW
Uni
Drive Condition
Action
Heatsink >95
°
C (Sizes 1 ~ 3 & 5)
Heatsink >100
°
C (Size 4)
Trip drive
Heatsink >92
°
C
Reduce switching frequency to 3kHz
Heatsink >88
°
C
Reduce switching frequency to 6kHz
Heatsink <85
°
C and IGBT temperature at
new switching frequency <135
°
C
Allow an increase in switching frequency
IGBT temperature >135
°
C
Reduce switching frequency
If it is already 3kHz, trip drive
5.19
High stability space vector modulation select
Ú
0 or 1
Ö
0
RW
Bit
5.20 ~
5.22
Unused parameters
NOTE
NOTE
Содержание COMMANDER SE
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Страница 142: ...142 Commander SE Advanced User Guide Issue Number 4 Figure 6 9 Input line reactor 4400 0241 All dimensions in mm...
Страница 144: ...144 Commander SE Advanced User Guide Issue Number 4 Figure 7 3 Commander SE Size 4 All dimensions in mm...