Proper setting for Amps Limit

5 years 4 months ago #29533732 by msacarny
Our BLDC motor has a continuous current limit of 16 Amps and a peak current rating of 50 Amps. We use controller MBL1660A. If I set Amps Limit to 15 Amps, I believe this prevents the controller from sending current pulses above this limit even though they are safe. If I set the limit to 45 Amps, it would allow continuous current above the continuous current rating. How can I configure to restrict continuous current to the continuous rating but allow pulses below the peak current rating?

Thank you!

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5 years 4 months ago #29533734 by Gabriel_Isko
Replied by Gabriel_Isko on topic Proper setting for Amps Limit
The current limit is designed to limit the absolute maximum current that the controller can output - the controller should never output current higher than the current limit.

Currently, there is no exact way to limit continuous current. This is intentional, since continuous current ratings for motor can often be over and underrated depending on the cooling conditions and duty cycle of an application. However, our controllers do have some features that will be useful for managing your current output.

We recommend looking at the Amp trigger functionality. This allows you to throw a condition when the controller has maintained a current output past a certain threshold for a certain amount of time. When an Amps trigger is activated, it can either be used to throw an Emergency or Safety stop by default, or it's status can be monitored at run time using the !FM command by an external controller or from a MicroBasic script.

The Amps trigger functionality is outlined on page 85 of our User Manual . Hopefully you will be able to implement the control you are looking for to make sure that you don't damage your motor from driving it past it's continuous current rating for too long using an Amp trigger. If you have any further questions or concerns, please let me know.

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