Sharpie55
Newbie level 1
Hi All,
I've inherited a project that uses a L297/L298 circuit lifted from the datasheet to drive a 36v 2A bipolar stepper motor in half step mode. This is used, via some mechanics, to force a probe through a rubber bung and sometimes it fails to pierce the bung. Most of the time it just judders until it times out but sometimes the motor goes into revese pulling the probe out.
Now I've solved the problem by using a more powerful motor but I'm still struggling to understand how the motor can go into reverse. I've checked all the signals in and out of both chips and nothing seems amiss.
Can anyone enlighten me?
Sharpie
I've inherited a project that uses a L297/L298 circuit lifted from the datasheet to drive a 36v 2A bipolar stepper motor in half step mode. This is used, via some mechanics, to force a probe through a rubber bung and sometimes it fails to pierce the bung. Most of the time it just judders until it times out but sometimes the motor goes into revese pulling the probe out.
Now I've solved the problem by using a more powerful motor but I'm still struggling to understand how the motor can go into reverse. I've checked all the signals in and out of both chips and nothing seems amiss.
Can anyone enlighten me?
Sharpie
