Emerson Powerdrive F300, Reference Manual

Page: 70 / 342

Parameter 05.006 Rated Frequency
Short description Set to the rated frequency of the motor
Mode Open
‑
Loop
Minimum 0.0 Maximum 550.0
Default See exceptions below Units Hz
Type 16 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 1
Coding RW
Region Default Value
50Hz 50.0
60Hz 60.0
Rated Frequency (05.006) and Rated Voltage (05.009) define the frequency to voltage characteristic applied to the motor. See Open-loop Control Mode (05.014) for more details. Rated Frequency (05.006), Rated Speed (05.008) and
Number Of Motor Poles (05.011) are used to calculate the rated slip of the motor for slip compensation.
Rated slip (Hz) = Rated Frequency (05.006) - (Pole pairs x Rated Speed (05.008) / 60)
where
Pole pairs = the numeric value of Number Of Motor Poles (05.011) (i.e. 3 for a 6 pole motor)
If slip compensation is required Rated Speed (05.008) 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. Rated Speed (05.008) can be set to a value that is higher than
synchronous speed to deliberately introduce speed droop, which can be used to aid load sharing with mechanically coupled motors.
Slip compensation is disabled under the following conditions:
1. Rated Speed (05.008) = 0
2. Rated Speed (05.008) = Rated Frequency (05.006) x 60 / Pole pairs, i.e. synchronous speed.
3. Enable Slip Compensation (05.027) = 0
It should be noted that Rated Speed (05.008) is used to calculate the rotor time constant of the motor which is then used to determine the flux build-up time at the start of the catch a spinning motor algorithm. If spinning start is required
(i.e. Catch A Spinning Motor (06.009) ≥ 1) then Rated Speed (05.008) should be set up correctly for the motor. If slip compensation is not required it can be disabled by setting Enable Slip Compensation (05.027) to 0.
Parameter 05.007 Rated Current
Short description Set to the rated current rated of the motor
Mode Open ‑ Loop
Minimum −VM_RATED_CURRENT Maximum VM_RATED_CURRENT
Default 0.000 Units A
Type 32 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 3
Coding RW, VM, RA
Rated Current (05.007) is used as follows:
1. To define the rated operating conditions for motor thermal protection. See Motor Thermal Time Constant 1 (04.015).
2. To define the range of the current limits.
3. In the motor control algorithm for Open-loop and RFC-A modes.
Parameter 05.008 Rated Speed
Short description Set to the rated speed of the motor
Mode Open ‑ Loop
Minimum 0 Maximum 33000
Default See exceptions below Units rpm
Type 32 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW
Region Default Value
50Hz 1500
60Hz 1800
See Rated Frequency (05.006).
Parameter 05.009 Rated Voltage
Short description Set to the rated voltage of the motor
Mode Open ‑ Loop
Minimum −VM_AC_VOLTAGE_SET Maximum VM_AC_VOLTAGE_SET
Default See exceptions below Units V
Type 16 Bit User Save Update Rate 4ms read
Display Format Standard Decimal Places 0
Coding RW, VM, RA
Voltage Region Default Value
200V All 230
400V 50Hz 400
400V 60Hz 460
575V All 575
690V All 690
Rated Frequency (05.006) and Rated Voltage (05.009) define the frequency to voltage characteristic applied to the motor. See Open-loop Control Mode (05.014) for more details.
Parameter 05.010 Rated Power Factor
Short description
Set to the rated power factor of the motor. This value can be measured by the drive during a rotating
autotune.
Mode Open ‑ Loop
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
Rated Power Factor (05.010) 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 (05.025) 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 (05.025) is non-zero Rated Power Factor (05.010) is continuously set to
the calculated value of rated power factor by the drive. If Stator Inductance (05.025) is set to zero then Rated Power Factor (05.010) is used to estimate the rated magnetising current which is an approximation and not as accurate.
Stator Inductance (05.025) 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 (05.025) then Rated Power Factor (05.010) should be set to
the motor nameplate value.
Parameter 05.011 Number Of Motor Poles
Short description Set to the number of poles of the motor
Mode Open ‑ Loop
Minimum 0 Maximum 240
Default 0 Units PolePairs
Type 8 Bit User Save Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW, BU
* The units relate to the text string of the parameter and not the numeric value.
The numeric value in Number Of Motor Poles (05.011) 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 (05.011) 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 (05.011) should be set to 1 (2 Pole).
If Number Of Motor Poles (05.011) = 0 the number of motor poles are calculated automatically as given below.
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Powerdrive F300 Parameter Reference Guide
Issue: 01.15.00