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Diagnostics Optimization CT MODBUS RTU Technical Data
198 E300 Design Guide
Issue Number: 1
Open-Loop
Motor Rated Frequency (B06) and Motor Rated Voltage (B03) define the frequency to voltage characteristic applied to the motor. See Open Loop
Control Mode (B09) for more details. Motor Rated Frequency (B06), Motor Rated Speed (B07) and Number Of Motor Poles (B05) are used to
calculate the rated slip of the motor for slip compensation.
Rated slip (Hz) = Motor Rated Frequency (B06) - (Pole pairs x Motor Rated Speed (B07) / 60)
where
Pole pairs = the numeric value of Number Of Motor Poles (B05) (i.e. 3 for a 6 pole motor)
If slip compensation is required Motor Rated Speed (B07) should be set to the motor nameplate value, which should give the correct compensation
for a hot motor provide the nameplate value is correct. Slip compensation can be used throughout the speed range of the motor, i.e. below base
speed and in the flux weakening region, to correct the motor speed to minimise the change of speed with load. Slip compensation is disabled under
the following conditions:
1. Motor Rated Speed (B07) = 0
2. Motor Rated Speed (B07) = Motor Rated Frequency (B06) x 60 / Pole pairs, i.e. synchronous speed.
3. Slip Compensation Enable (B10) = 0
If slip compensation is not required it can be disabled by setting Slip Compensation Enable (B10) to 0.
RFC-A
Motor Rated Frequency (B06), Motor Rated Speed (B07) and Number Of Motor Poles, Motor Number Of Motor Poles (B05) are used to calculate the
rated slip of the motor which is used by the motor control algorithm. An incorrect estimate of rated slip has the following effects:
1. Reduced efficiency
2. Reduction of maximum torque available from the motor
3.
R
educed transient performance
4. Inaccurate control of absolute torque in torque control modes
5. The drive will produce rated flux in the motor in the shortest possible time when it is enabled. Incorrect parameter values will affect the flux build-
up time.
The rated speed on the motor nameplate is normally the value for a hot motor, however, some adjustment may be required when the drive is
commissioned if this is inaccurate. Either a fixed value can be entered for Motor Rated Speed (B07) or the optimization system within the drive may
be used to automatically adjust the Motor Rated Speed (B07). See Motor Parameter Adaptive Control (B25). It should be noted that the optimization
system does not operate when sensorless RFC-A mode is used.
Open-Loop
See Motor Rated Frequency (B06).
RFC-A
Motor Rated Frequency (B06), Motor Rated Speed (B07) and Number Of Motor Poles, Motor Number Of Motor Poles (B05) are used to calculate the
rated slip of the motor which is used by the motor control algorithm. An incorrect estimate of rated slip has the following effects:
1. Reduced efficiency
2. Reduction of maximum torque available from the motor
3. Reduced transient performance
4. Inaccurate control of absolute torque in torque control modes
5. The drive will produce rated flux in the motor in the shortest possible time when it is enabled. Incorrect parameter values will affect the flux build-
up time.
The rated speed on the motor nameplate is normally the value for a hot motor, however, some adjustment may be required when the drive is
commissioned if this is inaccurate. Either a fixed value can be entered for Motor Rated Speed (B07) or the optimization system within the drive may
be used to automatically adjust the Motor Rated Speed (B07). See Motor Parameter Adaptive Control (B25). It should be noted that the optimization
system does not operate when sensorless RFC-A mode is used.
B06 Motor Rated Frequency
Mode Open-Loop, RFC-A
Minimum 0.0 Maximum 550.0
Default 50.0 Units Hz
Type 16 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 1
Coding RW
B07 Motor Rated Speed
Mode Open-Loop
Minimum 0 Maximum 33000
Default 1500 Units rpm
Type 32 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW
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