Beijer Electronics AN-BEI-P2-050 - Manual (Page 4)

APPLICATION NOTE AN-BEI-P2-050 Date: 15/02/12
AN-BEI-P2-050 Open Loop Permanent Magnet Motor Control 4
Set-up Procedure – Permanent magnet motors:
The following procedure should be followed to ensure correct parameterisation of the Beijer Frequency Inverter P2
P-2 and optimum performance from the permanent magnet motor.
Step 1: Entering basic motor parameters.
Note: Accurate entry of data for parameters P1-07 thru P1-10 is very important for optimum performance.
P1-07: Nominal back emf
Voltage imposed by the magnets when the motor is spun at rated speed and often referred to as motor nominal
voltage (UN). Its value can be found from the motor manufacturer, from the motor technical data sheet, or taken
from the motor data plate. Value entered must be phase to phase voltage. Phase voltages (phase – neutral) must be
multiplied by √3 (1.732) and the resultant value entered into P1-07
P1-08: Motor rated current
Rated phase current of the motor often referred to as the motor nominal current (IN). Its value can be found from
the motor manufacturer, from the motor technical data sheet, or taken from the motor data plate. Values given in
motor data are generally provided as current per phase and thus can be entered directly into P1-08.
P1-09: Motor rated frequency
Rated operating frequency of the motor often referred to as the motor nominal frequency (fN). Its value can be
found from the motor manufacturer, from the motor technical data sheet, or taken from the motor data plate.
P1-10: Motor rated speed
Rated output speed of the motor shaft often referred to as the motor nominal speed (nN). Its value can be found
from the motor manufacturer, from the motor technical data sheet, or taken from the motor data plate.
Step 2: Entering security code for Permanent Magnet parameter access.
In order to select PM motor control method and enter associated parameters a dedicated access code must be
entered into parameter P1-14. The dedicated code for PM motor set up is ‘201’. Once this value is set parameter
P4-01 will allow selection of PM motor control method and parameter group 7 will be available (visible). Security
Code ‘201’ also provides access to any menus accessible through the standard security password (default 101).
Step 3: Setting Beijer Frequency Inverter P2 effective output switching frequency.
Note: For smooth operation and consistent performance the minimum recommended switching frequency for PM
motor control is 16 kHz.
Setting of the drive output switching frequency is a compromise between smoothest possible operation and
minimisation of drive losses (and the potential need to de-rate the drive). Some testing may be required to
establish the lowest switching frequency (minimum 16kHz) that can be selected whilst maintaining the required
level of performance. When increasing switching frequency setting always consult the appropriate de-rating data
and configure parameter P1-08, Motor rated current, appropriately.
Step 4: Selecting PM motor control.
Set parameter P4-01, Beijer Frequency Inverter P2 control method, to a value of 3 to enable PM motor control. If
P1-14 has not been set with the correct security code then P4-01 will be locked at a maximum value ‘2’ (refer to
set-up Step 2).
Step 5: Beijer Frequency Inverter P2 Auto-tune for PM motor control.
Motor inductance and resistance values, programmed into Beijer Frequency Inverter P2 menu 7, can be configured
manually or derived by the Beijer Frequency Inverter P2 software using the auto-tune function.
If motor values for parameter menu 7 are know then step 5 can be omitted and the values entered manually,
however it is generally recommended for optimum performance and ease of set-up that the auto-tune procedure
is completed.
To activate auto-tune function set parameter P4-02 to value ‘1’ and exit the parameter. Auto-tune begins
immediately on exiting the parameter. During auto-
returning to its normal condition once auto-tune is complete.