Diagnostics Optimization CT MODBUS RTU Technical Data
E300 Design Guide
217
Issue Number: 1
Minimum test current level used for Id during auto-tuning when measuring the motor inductance as a percentage of
Motor Rated Current
(
B02
). This
is then used in a similar way as
Iq Test Current For Inductance Measurement
(
B38
) to estimate the value of Lq used in the control algorithms as Id
changes. If
Lq At The Defined Id Test Current
(
B42
) or
Id Test Current for Inductance Measurement
(
B41
) are set to zero then no compensation is
made for changes in Lq with Id.
Motor q axis inductance with no current in the q axis and the current defined by
Id Test Current for Inductance Measurement
(
B41
) in the d axis of the
motor. If this parameter is left at its default value of zero then no compensation is made to the value of Lq with changes in Id.
In sensorless mode the drive estimates a value for Lq to use in the control algorithm.
Estimated Lq
(
B43
) shows the calculated value.
See
Motor Thermal Time Constant 1
(
B20
).
If
Quasi-square Enable
(
B45
) = 0 then the output of the drive is limited to a modulation index of unity, which limits the output voltage to a level just
below
D.c. Bus Voltage
(
J65
) /
√
2. Therefore, if the drive is being supplied via its own rectifier input stage the output voltage is limited to a level just
below that of the supply voltage or
Motor Rated Voltage
(
B03
) whichever is lower.
If
Quasi-square Enable
(
B45
) = 1 then the limit imposed by
Quasi-square Enable
(
B45
) is ignored and the modulation index is allowed to increase
beyond unity. As the output voltage increases the output voltage changes through trapezoidal waveforms to a quasi-square wave output. This mode
is useful where the ratio between the switching frequency and the fundamental output frequency is less than 12, as it removes any sub-harmonic
effects that occur. However, it does produce significant multiple odd harmonics of the output frequency in the output currents which cause acoustic
noise, torque ripple and motor heating.
B42
lq At The Defined ld Test Current
Mode
RFC-S
Minimum
0.000
Maximum
500.000
Default
0.000
Units
mH
Type
32 Bit User Save
Update Rate
Background read
Display Format
Standard
Decimal Places
3
Coding
RW, RA
B43
Estimated Lq
Mode
RFC-S
Minimum
0.000
Maximum
500.000
Default
Units
mH
Type
32 Bit Volatile
Update Rate
Background write
Display Format
Standard
Decimal Places
3
Coding
RO, Fl, ND, NC, PT
B44
Low Speed Thermal Protection Mode
Mode
Open-Loop, RFC-A, RFC-S
Minimum
0
Maximum
1
Default
0
Units
Type
8 Bit User Save
Update Rate
Background read
Display Format
Standard
Decimal Places
0
Coding
RW
B45
Quasi Square Enable
Mode
Open-Loop
Minimum
0
Maximum
1
Default
0
Units
Type
1 Bit User Save
Update Rate
Background
Display Format
Standard
Decimal Places
0
Coding
RW
Summary of Contents for 03200106
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