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5: Square (Fixed boost with square characteristic)
A fixed square frequency to voltage characteristic is used as shown below. When the |
Output Frequency
(05.001)| is below
Motor Rated Frequency
(05.006)
the
Output Voltage
(05.002) is given by:
Output Voltage
(05.002) =
Low Frequency Voltage Boost
(05.015) + [(
Motor Rated Voltage
(05.009) -
Low Frequency Voltage Boost
(05.015)) x ( |
Output Frequency
(05.001) | /
Motor Rated Frequency
(05.006))
2
]
6: Fixed boost with tapered slip limit
Normally, slip compensation calculations do not allow the final output frequency to be opposite in sign to the final frequency reference. This can be an issue in
some applications where good torque control is required close to zero speed. In this mode of operation this limitation is removed.
To give even better control of the amount of slip being applied close to zero speed
Low Frequency Estimator Threshold, Low Frequency Torque adjustment
(05.084) can be used to taper the slip compensation limit (
Slip Compensation Limit
(05.033) ) down to 0 at zero frequency demand.
If the slip limit taper start point set by
Low Frequency Estimator Threshold, Low Frequency Torque adjustment
(05.084) is >
Slip Compensation Limit
(05.033) then there is still no slip compensation applied in the opposite direction to the final frequency demand (see Fig 5.11a), but if the slip limit taper start
point set by
Low Frequency Estimator Threshold, Low Frequency Torque adjustment
(05.084) is <
Slip Compensation Limit
(05.033) then a controlled amount
of slip compensation can be applied in the opposite direction to the final frequency demand (see Fig 5.11b)
Unidrive M200 Parameter Reference Guide
Issue: 01.05.00.10
69
Summary of Contents for unidrive m200
Page 1: ...Parameter Reference Guide Unidrive M200 Open loop Mode Issue 01 05 00 10 ...
Page 30: ...30 Unidrive M200 Parameter Reference Guide Issue 01 05 00 10 ...
Page 83: ...Enable logic Unidrive M200 Parameter Reference Guide Issue 01 05 00 10 83 ...
Page 125: ...Unidrive M200 Parameter Reference Guide Issue 01 05 00 10 125 ...
Page 145: ...Unidrive M200 Parameter Reference Guide Issue 01 05 00 10 145 ...
Page 204: ...204 Unidrive M200 Parameter Reference Guide Issue 01 05 00 10 ...