I'm working with a colleague to digitally control an old peristaltic pump using a digital potentiometer. The existing pump controller has a mechanical potentiometer and we are trying to replace it with an MCP4131-103.
Can anyone lend some insight on the types of questions we should be asking before doing a direct replacement? We have already burned a couple and I suspect we are wiring it incorrectly or using an under-rated IC. One measurement we already have is that the voltage across the A-B of the mechanical pot during operation is about 10V (from ground, I think I measured -40V on A and -50V on B, if that matters). Is that too much for this IC? Can anyone provide some pointers on how to proceed? Is there a better way to replace a mechanical pot than with a digital pot to allow for programmatic control?
Thanks in advance for the help provided. If I need to provide clearer details, please tell me some measurements/observations I can make about the current setup.