What Should Be Recommended

An uninterruptable power supply:

(not an endorsement)

What are you asking for?

Are you looking for a way to fix an OEM product's behavior? Or is this your own microprocessor design and you have a problem?

For the first issue I would just buy a simple UPS power backup unit for the micro. Then power interruption will have no effect. I do this for my milling machines so the electronics do not reset.

If this is your own design, then I would suggest a power supply monitoring chip that has a built in reset function when the power supply level falls to a set level, thus insuring the system will not get into a locked state and restart in a controlled way.

I would also revisit the power supply design to make sure that there is sufficient drive for the circuit and enough reserve capacitance to serve your needs.

The best solution is UPS. I installed UPSs with all PLCs.

This actually an OEM product behavior. Installing UPS to micro seem to be a good idea, but i have a drive too intergrated to the system, does it supposed to be included scheduled for UPS?

to run a ac drive from power derived from a ups requires too much thinking and after all the thinking the answer may be a NO . . .

You should power the whole microcomputer and drive and any peripherals for the machine off of the same UPS.

any advice then for a 15KW UPS, how big is this? Is there available on the market?

Is there any other means to counter measure the power interruption? How about an AVR would that do given change in voltage would be about a split second?

Your best answer would come from the manufacture of the equipment you are trying to protect. I would recommend calling them and speaking to a technical representative or engineer.

The UPS should be sized to fit the power requirements of the electronics. I am not sure that you need to run the mechanical machine from a UPS, but I am not clear on the full nature of your needs. It is hard to understand the complete story by simply writing "emails" back and forth.

That is why I recommend either calling an expert on the phone or a face-to-face discussion with a field engineer to make sure you have all your bases covered.

do you need to restart your process from where you left it when power dropped?

or does your process need to restart from the last finished stage?

or does your process need to restart from zero state?

all of the above need to be attended by your system designer and software writer together.

-

-

-

now for the hardware issue and need to restart electrically . . .

if your process does not require a full restart from cold state then - go for a ups that has a communication interface so that your program has time to shut down and your drives have time to park and all is well before you disconnect power from your control systems . . . in addition to communication, your ups must also have enough battery capacity to last till all the shut down takes place . . . some processes may require some cycle to complete before shutting down too . . .