RoboteQ Dual Channel Digital Motor Controller AX500 用户手册

38

The AX500 has current sensors at each of its two output stages. Every 16 ms, this current 
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 supplied PC utility. Using the PC utility is it possible 
to set the limit with a 0.125A granularity from 1.625 to 15A

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

The AX500 features active current limitation that uses a combination of a user defined pre-
set 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.

When the measured temperature reaches 80oC, the controller’s maximum current limit 
begins to drop to reach 0A at 100oC. Above 100oC, the controller’s power stage turns itself 
off completely.

TABLE 3. Effect of Heatsink temperature on Max Amps Limit

Below 80 oC

15A

80 oC

15A

85 oC

10A

90 oC

7.5A

95 oC

2.5A

100 oC

0

Above 100 oC

Both Power Stages OFF

Position Sensor

Gear box

Position Feedback

FIGURE 16. Motor with potentiometer assembly for Position operation