Parameter 04.020 Percentage Load
Short description
Shows the level of torque producing current as a percentage of rated torque producing current for the
motor
Mode Open‑Loop
Minimum −VM_USER_CURRENT Maximum VM_USER_CURRENT
Default Units %
Type 16 Bit Volatile Update Rate Background write
Display Format Standard Decimal Places 1
Coding RO, FI, VM, ND, NC, PT
Percentage Load (04.020) gives the Iq, Torque Producing Current (04.002) as a percentage of the rated torque producing current for the motor. Positive
values indicate motoring and negative values represent regenerating.
Parameter 04.021 Current Feedback Filter Disable
Short description Disables the 16ms filter applied to current feedback parameters
Mode Open‑Loop
Minimum 0 Maximum 1
Default 0 Units
Type 1 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW
If Current Feedback Filter Disable (04.021) = 0 a 4ms filter is applied to the current feedback components measured by the drive to be used in Iq,
Torque Producing Current (04.002) and Id, Magnetising Current (04.017). This filter removes ripple components associated with the PWM switching. If
Current Feedback Filter Disable (04.021) = 1, the filter is disabled and the user parameters are based on the current components sampled every
250us.
Parameter 04.024 User Current Maximum Scaling
Short description Defines the maximum for the torque reference and percentage load parameters
Mode Open‑Loop
Minimum −VM_TORQUE_CURRENT_UNIPOLAR Maximum VM_TORQUE_CURRENT_UNIPOLAR
Default 165.0 Units %
Type 16 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 1
Coding RW, VM, RA
User Current Maximum Scaling (04.024) defines the variable maximum/minimums VM_USER_CURRENT and VM_USER_CURRENT_HIGH_RES
which are applied to Percentage Load (04.020), Torque Reference (04.008) and Torque Offset (04.009). This is useful when routing these parameters
to an analog output as it allows the full scale output value to be defined by the user.
The maximum value (VM_TORQUE_CURRENT_UNIPOLAR [MAX]) varies between drive sizes with default parameters loaded. For some drive sizes
the default value may be reduced below the value given by the parameter range limiting.
Parameter 04.025 Low Speed Thermal Protection Mode
Short description Set to enable low speed thermal protection mode
Mode Open‑Loop
Minimum 0 Maximum 1
Default 0 Units
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW
See Motor Thermal Time Constant 1 (04.015).
Parameter 04.026 Percentage Torque
Short description Sows the calculated torque as a percentage of rated torque
Mode Open‑Loop
Minimum −VM_USER_CURRENT Maximum VM_USER_CURRENT
Default Units %
Type 16 Bit Volatile Update Rate 4ms Write
Display Format Standard Decimal Places 1
Coding RO, FI, VM, ND, NC, PT
The shaft torque of the motor is estimated by the drive and Percentage Torque (04.026) gives this torque as a percentage of the expected torque
defined by Rated Torque (04.041). The default value for Rated Torque (04.041) is zero which disables this feature so that Percentage Torque
(04.026) is always zero. To enable the torque estimation system Rated Torque (04.041) should be set to the expected torque from the motor under
rated conditions. For accurate torque estimation, and consistent results for both motoring and regenerating conditions, it is necessary to provide the
drive with the core losses under no-load and rated load conditions at rated speed (i.e. No-load Core Loss (04.045) and Rated Core Loss
(04.046) respectively). The drive will then include the core power loss in the torque calculation as
PCoreLoss = No-load Core Loss (04.045) + (Rated Core Loss (04.046) - No-load Core Loss (04.045)) x (Torque Producing Current / Rated Torque
Producing Current)
To Next Page
Loading...
