Commander SE Advanced User Guide
49
Issue Number: 4
The stator resistance test is carried out at half and full rated motor current. A current is applied in the y axis of the reference
frame with zero frequency, and so DC current flows in all three phases of the machine. The results are as shown in the
following drawing.
The gradient of the line gives the stator resistance, cabling resistance and resistance effects within the drive. The units are
converted to ohms before being stored in
5.17
.
The drive must produce a voltage before any current flows, shown as V
offset
. This includes IGBT voltage drops etc. To obtain
good performance at low frequencies where the machine terminal voltage is small this offset must be taken into account. The
value shown in
5.23
is given in volts, representing the voltage that would be applied on the U phase output as a DC level. The
voltages on the other two phases would be -V
offset
/2. It is not possible for the user to measure this voltage easily, and so an
automatic measurement procedure should be used, either by using the autotune or selecting mode 0 (see
5.14
). When an
autotune is carried out, the calculated voltage offset is automatically saved.
The total leakage inductance of the motor is stored in this parameter, it is measured at the start of the magnetising current
test. After an autotune, the calculated motor inductance is automatically saved.
The total leakage inductance can be calculated from the steady state per phase equivalent circuit of the motor:
L
s
' = L
1
+ (L
2
.L
m
/ (L
2
+ L
m
))
L
s
' is used for automatic calculation of the motor power factor during the autotune test.
Selects the units for the displayed speed
0
Fr
Drive output in Hz (
2.01
)
1
SP
Motor speed in RPM (
5.04
)
2
Cd
Machine speed in customer defined units (Scaled from
5.04
)
This parameter defines whether the speed indication in parameter status mode indicates motor output frequency (0), speed
in RPM (1) or customer defined units (2).
When parameter 5.34 is set to 1 (SP), the display will show a maximum of 9999rpm.
5.23
Voltage offset
Ú
0 ~ 25.5
Ö
V
RW
Uni
5.24
Motor leakage inductance
Ú
000.0 ~ 500.0
Ö
mH
RO
Uni
P
5.25 ~
5.33
Unused parameters
5.34
Speed indication selector
Ú
0 ~ 2
Ö
0(Fr)
RW
Uni
Txt
P
Voltage
V
2
V
1
V
offset
I
rated
/2 I
rated
NOTE
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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...
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