Some are 2500 some are 3000 and there may even be some that are 5000 per time. I think there are placards affixed to the ATM that say the limit. They are all in Chinese but you can look for the numbers to get and idea.

I haven’t withdrawn cash from an ATM for a few years in China but used to do at PVG all the time. I think ICBC had the highest limits then. Look into getting the Alipay for foreigners thing they just introduced and it will make life easier on the mainland.