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Diagnostics Optimization CT MODBUS RTU Technical Data
E300 Design Guide 197
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.
RFC-A
The Motor Rated Voltage (B03) is the maximum continuous voltage that is applied to the motor. Normally this should be set to the motor nameplate
value. If the drive is supplied through its own diode rectifier the maximum possible output voltage is just below the supply voltage level, and so the
output voltage will not reach Motor Rated Voltage (B03) if this is equal to or above the supply voltage. If high transient performance is required at
higher speeds then Motor Rated Voltage (B03) should be set to 95 % of the minimum DC Bus Voltage divided by √2 to allow some headroom for the
drive to control the motor current. If the drive is fed through its own diode rectifier the minimum DC Bus Voltage is approximately supply voltage x √2.
In some cases it may be necessary to set the Motor Rated Voltage (B03) to a value other than the motor nameplate value. If this is the case the Motor
Rated Frequency (B06) and Motor Rated Speed (B07) should be set up as follows:
K = Motor Rated Voltage (B03) / motor rated voltage
Motor Rated Frequency (B06) = motor rated frequency x K
Motor Rated Speed (B07) = motor rated speed + [(K - 1) x motor rated frequency x 60 / (number of motor poles / 2)]
The Motor Rated Voltage (B03), Motor Rated Frequency (B06) and Number Of Motor Poles (B05) are used during the auto-tuning process to
determine the flux level required in the motor for normal operation. Therefore if the Motor Rated Voltage (B03) is set to a value other than the
nameplate value and the above adjustment is not applied the motor may be under or over-fluxed
RFC-S
The Motor Rated Voltage (B03) is the maximum continuous voltage that is applied to the motor. As with RFC-A mode some headroom must be
allowed if high performance is required at higher speeds. It should be noted that this limit is not applied unless Enable High Speed Mode (B28) is
set
to
1.
Motor Rated Power Factor (B04) is the true power factor of the motor under rated conditions, i.e. the cosine of the angle between the motor voltage
and current. If Stator Inductance (B35) is set to a non-zero value then the stator inductance is used to calculate the rated magnetising current for the
motor and the rated power factor can be calculated by the drive. Therefore if Stator Inductance (B35) is non-zero Motor Rated Power Factor (B04) is
continuously set to the calculated value of rated power factor by the drive. If Stator Inductance (B35) is set to zero then Motor Rated Power Factor
(B04) is used to estimate the rated magnetizing current which is an approximation and not as accurate. Stator Inductance (B35) can be measured by
the drive during auto-tuning and this is the preferred option, however, if it is not possible to obtain the value for Stator Inductance (B35) then Motor
Rated Power Factor (B04) should be set to the motor nameplate value.
* The units relate to the text string of the parameter and not the numeric value.
The numeric value in Number Of Motor Poles (B05) should be set to the number of motor pole pairs (i.e. number of motor poles / 2). The text strings
associated with Number Of Motor Poles (B05) show the number of motor poles (i.e. the parameter value x 2). If a linear position feedback device is
used Number Of Motor Poles (B05) should be set to 1 (2 Pole).
If Number Of Motor Poles (B05) = 0 the number of motor poles are calculated automatically as given below.
Pole pairs = 60 x Motor Rated Frequency (B06) / Motor Rated Speed (B07) rounded down to the nearest integer.
Open-loop
RFCA:
RFCS: Pole pairs 8 (16 pole)
B04 Motor Rated Power Factor
Mode Open-Loop, RFC-A
Minimum 0.000 Maximum 1.000
Default 0.850 Units
Type 16 Bit User Save Update Rate Background read/write
Display Format Standard Decimal Places 3
Coding RW, RA
B05 Number Of Motor Poles
Mode Open-Loop, RFC-A, RFC-S
Minimum 0 Maximum 240
Default
Open-Loop, RFC-A: 0
RFC-S: 3
Units Pole Pairs
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW, BU
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