DG-IRMCK203 Datasheet, PDF (24/67 Pages) International Rectifier – Application Developer’s Guide

IRMCK203 Application Developer’s Guide
Step 2. Import Drive Parameters
From the File menu, select Import, and from the Import sub-menu, select Drive Parameters. Browse to locate the text
file that was exported from Excel and click Open to open it. In the Import Drive Parameters dialog, select one of the
three available modes and click OK. Depending on the selected mode, ServoDesigner may prompt for confirmation
before modifying each register setting or group of settings. Refer to the ServoDesigner User’s Guide for more
information about the available modes of operation.
Step 3. Save the New Settings
The Import Drive Parameters function in ServoDesigner updates register values in the database that’s currently open.
To save the new settings in the configuration file, select Save from the File menu before exiting ServoDesigner. If
this is not done, the updates will be lost, and the Import Drive Parameters function will need to be repeated next time
the configuration file is opened.
Step 4. Write the Settings to the IRMCK203
The Import Drive Parameters function does not write any values to the IRMCK203; it simply updates the register
settings in the database. To transfer the register settings to the IRMCK203, it is necessary to either double click each
write register individually (not recommended) or execute a function that writes the registers automatically. The
Configure Motor function is pre-defined for this purpose. To execute the Configure Motor function, click the
Configure Motor icon on the toolbar, or double click Configure Motor in the Function Definitions section of the tree
view.
3.1.2 Evaluating Drive Performance
The drive parameter translation as described in the previous section is the first step of drive commissioning. It is
expected that the user parameter entries such as motor nameplate information and load inertia will have at least 10%
error. This is typical due to the inaccuracy in motor datasheet and load information. The drive performance can be
further refined by going through drive diagnostics as described in Section 3.1.3.
For motor control purposes, the rotor angle information is required to optimally control a Permanent Magnet AC
motor. In the IRMCK203, the control is performed without a shaft encoder (Sensorless). The rotor angle is
estimated utilizing motor phase (V, W) current and DC bus voltage feedback information.
In the IRMCK203 drive controller, there are 3 control modes (Figure 11) for estimation of the rotor angle for the entire
speed range including zero speed. During motor start-up phase, the controller will go through these three control
modes in sequence. These control modes are described below.
100%
10%
(1) Parking
(3) Closed-Loop
(2) Open-Loop
Figure 11. Drive Control Modes
1) Parking – The initial rotor angle is identified by forcing DC current into the motor and hence forcing the
motor shaft to park at a certain prescribed angle.
This document is the property of International Rectifier and may not be copied or distributed without expressed consent.
24