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AX2550 Motor Controller User’s Manual 97
Mode Description
SECTION 9 Closed Loop
Speed Mode
This section discusses the AX2550 Close Loop Speed mode.
Mode Description
In this mode, an analog or digital speed sensor measures the actual motor speed and com-
pares it to the desired speed. If the speed changes because of changes in load, the control-
ler automatically compensates the power output. This mode is preferred in precision motor
control and autonomous robotic applications.
The AX2550 incorporates a full-featured Proportional, Integral, Differential (PID) control
algorithm for quick and stable speed control.
Selecting the Speed Mode
The speed mode is selected by changing the Motor Control parameter in the controller to
either:
• A and B Closed Loop Speed, Separate
• A and B Closed Loop Speed, Mixed
• A Closed Loop Speed, B Position
Note that in the last selection, only the first motor will operate in the Closed Loop Speed
mode.
Changing the parameter to select this mode is done using the Roborun Utility. See “Load-
ing, Changing Controller Parameters” on page 181.
For safety reasons and to prevent this mode from being accidentally selected, Closed Loop
Speed modes CANNOT be selected by configuring the controller using the built-in
switches and display.