Emerson unidrive m200 - Dynamic V to F Select; Open-Loop Voltage Mode

Parameter Required for Measured in test
MotorRatedFrequency (05.006) Basic control
MotorRatedCurrent (05.007) Basic control
MotorRatedSpeed (05.008)
Slip compensation
Catch a spinning motor
MotorRatedVoltage (05.009) Basic control
MotorRatedPowerFactor (05.010) Basic control 2
NumberOfMotorPoles (05.011) Basic control
StatorResistance (05.017)
Ur, Ur I, Ur S and Ur Auto modes
Catch a spinning motor
1, 2
TransientInductance (05.024) Improved performance 1, 2
StatorInductance (05.025) Improved performance 2
MaximumDeadtimeCompensation (05.059) Basic control 1, 2
CurrentAtMaximumDeadtimeCompensation (05.060) Basic control 1, 2
Auto-tune test 1: Basic control parameters
This test measures the basic control parameters without moving the motor.
1. A stationary test is performed to measure StatorResistance (05.017), TransientInductance (05.024), MaximumDeadtimeCompensation
(05.059) and CurrentAtMaximumDeadtimeCompensation (05.060).
Auto-tune test 2: Basic control and improved performance parameters
This test measures the parameters for improved performance by rotating the motor.
1. Auto-tune test 1 is performed.
2. A rotating test is performed in which the motor is accelerated with the currently selected ramps up to a frequency of MotorRatedFrequency (05.006)
x 2/3, and the frequency is maintained at that level for 4 seconds. StatorInductance (05.025) is measured and this value is used in conjunction with
other motor parameters to calculate MotorRatedPowerFactor (05.010). The motor should be unloaded for this test.
The table below shows the trips that can occur during an auto-tune test:
Trip Reason
Trip can occure in
test
AutotuneStopped
The final drive enable or the final drive run were removed before the test
was completed.
All
Resistance
The measured value of StatorResistance (05.017) exceeded the range of
the parameter.
All
Parameter 05.013 Dynamic V To F Select
Short description Set to 1 to enable Dynamic V to F 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
Dynamic V to F mode is intended for applications where power loss should be kept to a minimum under low load conditions, but dynamic performance is not
important. The reduction in power loss under low load conditions is achieved by increasing the rated frequency used to derive the frequency to voltage
characteristic of the drive with reduced load. If FluxOptimisationSelect,DynamicVToFSelect (05.013) = 0 then MotorRatedFrequency (05.006) is used
directly to define the output voltage characteristic. If FluxOptimisationSelect,DynamicVToFSelect (05.013) = 1 then a modified value of motor rated
frequency is used:
Motor rated frequency = MotorRatedFrequency (05.006) x [2 - |PercentageLoad (04.020)| / 70.0%]
For loads > 70% MotorRatedFrequency (05.006) is used directly.
Parameter 05.014 Open-loop Voltage Mode
Short description Defines the mode used to set the output voltage
Mode Open‑loop
Minimum 0 Maximum 6
Default 4 Units
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW, TE
Unidrive M200 Parameter Reference Guide
Issue: 01.05.00.10
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