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Diagnostics Optimization CT MODBUS RTU Technical Data
216 E300 Design Guide
Issue Number: 1
Motor q axis inductance with no current in the motor.
Maximum test current level used for Iq during auto-tuning when measuring the motor inductance and phase offset as a percentage of Motor Rated
Current (B02). This value is also used by the sensorless control algorithm to define the motor inductance and a reference frame phase offset at
different levels of Iq. The values of Lq At The Defined Iq Test Current (B40) and Phase Offset At Iq Test Current (B39) should be the values which
correspond to the test current level and will be set up during locked rotor auto tune tests (contact drive supplier for mor details). Alternatively these
values can be set up by the user. For most motors Phase Offset At Iq Test Current (B39) will be zero and have little affect on the performance,
however Lq is likely to vary significantly with Iq and should be set up correctly for good performance. If Lq At The Defined Iq Test Current (B40) or Iq
Test Current For Inductance Measurement (B38) are zero then the estimate of Lq will not be affected by the level of Iq, and if Phase Offset At Iq Test
Current (B39) or Iq Test Current For Inductance Measurement (B38) are zero the phase offset will not be affected by the level of Iq.
Phase Offset At Iq Test Current (B39) defines the offset of the point of minimum inductance as an electrical angle from the point with no current in the
motor to the point with a level of Iq equivalent to Iq Test Current For Inductance Measurement (B38). When the value is left at its default value of zero
no compensation for phase offset with changes in Iq are made. Phase Offset At Iq Test Current (B39) is used for low speed RFC sensorless control
using injection mode. A positive value advances the point of minimum inductance with positve Iq. See Sensorless Low Speed Mode (C15). For most
motors a value of zero is acceptable.
Motor q axis inductance with no current in the d axis and the current defined by Iq Test Current For Inductance Measurement (B38) in the q 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 Iq.
B37 No Load Lq
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
B38 Iq Test Current For Inductance Measurement
Mode RFC-S
Minimum 0 Maximum 200
Default 100 Units %
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW, BU
B39 Phase Offset At lq Test Current
Mode RFC-S
Minimum -90.0 Maximum 90.0
Default 0.0 Units °
Type 16 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 1
Coding RW, RA
B40 Lq At The Defined Iq 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
B41 ld Test Current for Inductance Measurement
Mode RFC-S
Minimum -100 Maximum 0
Default -50 Units %
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW
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