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E300 Design Guide 345
Issue Number: 1
The Final Torque Reference (J27) is converted into the Final Current Reference (J20) by applying a torque to current conversion and by applying the
Final Current Limit (J21). The torque to current conversion is applied as follows:
Current reference = Final Torque Reference (J27) x Motor Rated Flux / Motor Flux.
Final Current Limit (J21) is the current limit level that is applied to the torque producing current.
Current Magnitude, Total Output Current (J22) is the instantaneous drive output current scaled so that it represents the r.m.s. phase current in Amps
under steady state conditions.
Percentage Load (J23) gives the Torque Producing Current (J24) as a percentage of the rated torque producing current for the motor. Positive values
indicate motoring and negative values represent regenerating.
Torque Producing Current (J24) is the instantaneous level of torque producing current scaled so that it represents the r.m.s. level of torque producing
current under steady state conditions. Torque Producing Current (J24) is proportional to the torque produced by the motor provided field weakening is
not active. For field weakening operation the Torque Producing Current (J24) is boosted for a given level of torque to compensate for the reduction in
the motor flux. The sign of Torque Producing Current (J24) is defined in the table overleaf.
J20 Final Current Reference
Mode Open-Loop, RFC-A, RFC-S
Minimum −VM_TORQUE_CURRENT Maximum VM_TORQUE_CURRENT
Default Units %
Type 16 Bit Volatile Update Rate 4 ms write
Display Format Standard Decimal Places 1
Coding RO, FI, VM, ND, NC, PT
J21 Final Current Limit
Mode Open-Loop, RFC-A, RFC-S
Minimum −VM_TORQUE_CURRENT Maximum VM_TORQUE_CURRENT
Default Units %
Type 16 Bit Volatile Update Rate 4 ms write
Display Format Standard Decimal Places 1
Coding RO, VM, ND, NC, PT
J22 Total Output Current
Mode Open-Loop, RFC-A, RFC-S
Minimum −VM_DRIVE_CURRENT_UNIPOLAR Maximum VM_DRIVE_CURRENT_UNIPOLAR
Default Units A
Type 32 Bit Volatile Update Rate 4 ms write
Display Format Standard Decimal Places 3
Coding RO, FI, VM, ND, NC, PT
J23 Percentage Load
Mode Open-Loop, RFC-A, RFC-S
Minimum −VM_USER_CURRENT Maximum VM_DRIVE_CURRENT_UNIPOLAR
Default Units %
Type 16 Bit Volatile Update Rate Background write
Display Format Standard Decimal Places 3
Coding RO, FI, VM, ND, NC, PT
J24 Torque Producing Current
Mode Open-Loop, RFC-A, RFC-S
Minimum −VM_DRIVE_CURRENT Maximum VM_DRIVE_CURRENT
Default Units A
Type 32 Bit Volatile Update Rate 250 µs write
Display Format Standard Decimal Places 3
Coding RO, FI, VM, ND, NC, PT
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