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Diagnostics Optimization CT MODBUS RTU Technical Data
346 E300 Design Guide
Issue Number: 1
Magnetizing Current (J25) is the instantaneous level of magnetizing current scaled so that it represents the rms level of magnetizing current under
steady state conditions.
See Motor Thermal Time Constant 1 (B20).
The Speed Loop Output (J32) can include a feed forward torque that will provide the torque necessary to accelerate the load inertia. This can be
combined with the Inertia Compensation Torque (E17) and the Load cell compensation torque (E13) to give the Final Torque Reference (J27) as a
percentage of the rated torque producing for the motor.
Final Current Filter Time Constant (J28) defines the time constant of a first order filter that can be applied to the Final Current Reference (J20). The
filter is provided to reduce acoustic noise and vibration produced as a result of position feedback quantisation. The filter introduces a lag in the speed
controller loop, and so the speed controller gains may need to be reduced to maintain stability as the filter time constant is increased.
Sign of Torque Producing
Current (J24)
Sign of frequency
or speed
Direction of motor
torque
+ + Accelerating
-+Decelerating
+-Decelerating
- - Accelerating
J25 Magnetizing 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
J26 Motor Protection Accumulator
Mode Open-Loop, RFC-A, RFC-S
Minimum 0.0 Maximum 100.0
Default Units %
Type 16 Bit Power Down Save Update Rate Background write
Display Format Standard Decimal Places 1
Coding RO, ND, NC, PT
J27 Final Torque Reference
Mode Open-Loop, RFC-A, RFC-S
Minimum −VM_TORQUE_CURRENT Maximum VM_TORQUE_CURRENT
Default Units %
Type 16 Bit Volatile Update Rate 250 µs write
Display Format Standard Decimal Places 1
Coding RO, FI, VM, ND, NC, PT
J28 Final Current Filter Time Constant
Mode RFC-A, RFC-S
Minimum 0.0 Maximum 25.0
Default 0.0 Units ms
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 1
Coding RW, BU
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