RoboteQ AX2850 User Selected Current Limit Settings, Temperature-Based Current Limitation

General Operation

Position Feedback

Position Sensor

Gear box

FIGURE 18. Motor with potentiometer assembly for Position operation

User Selected Current Limit Settings

The AX2550 has current sensors at each of its two output stages. Every 16 ms, this cur- rent is measured and a correction to the output power level is applied if higher than the user preset value.

The current limit may be set using the controller’s switches or the supplied PC utility. Using the switches, 7 limits may be selected as shown in the table below.

TABLE 4. Current limit settings using the switches

Setting	Continuous High Amps
0	30A
1	45A
2	60A
3	75A
4	90A
5 - default	105A
6	120A

Using the PC utility is it possible to set the limit with a 1A granularity from 15A to 120A

During normal operation, current limiting is further enhanced by the techniques described in the following sections.

Temperature-Based Current Limitation

The AX2550 features active current limitation that uses a combination of a user defined preset value (discussed above) which in turn may be reduced automatically based on mea- sured operating temperature. This capability ensures that the controller will be able to work safely with practically all motor types and will adjust itself automatically for the various load conditions.

44 AX2550 Motor Controller User’s Manual Version 1.9b. June 1, 2007