15 Minutes Power Back Up For 5.5 KW

I would follow the OEM recommendations without deviation.

It is the lowest cost, most reliable solution.

1. What is your problem with following the OEM recommendation of 15kva?

2.Of course there are other alternatives. The question is are they any better financially? You can get a smaller UPS that will supply power long enough to get a generator running, but will it cost less? Be more or less maintenance? Be more or less stable?

3. The reason for the 15 minutes is to allow the cone crusher to clear any product still in the infeed (after you have stopped feeding - IMMEDIATELY). Not following the OEM recommendations puts the responsibility for any failures directly on your shoulders.

but it is OEM responsibility to justify. because all factors to be consider during design. this is u can say failure of design. am I right.

2. Any other alternative solution to run 5.5 kW for 15 minutes without ups.

A separate independent three phase feed (separate grid feed or generator feed) connected to a source transfer switch. This is more expensive however.

I've done countless cone crusher systems, the entire concept seems ludicrous to me. They are asking you to supply the LUBE PUMP with 15 minutes worth of power in the advent of a power failure? Why? Sure, the lube pump stops when power fails, but SO DOES THE CONE CRUSHER! The general plan is a lube system with a small reservoir which is mounted above the lube points so that when power fails, the lube oil still flows by gravity down to them for a few seconds as the crusher winds down. 15 minutes seems excessive to me. And adding a UPS with batteries, scheduled maintenance, out gassing issues, extreme vibration and high degrees of pollution (dust) is just BEGGING for a down-time nightmare.

Unless maybe they want to cool off the lube oil after a power failure as well, in which case your UPS size might be based on the pump AND a cooling fan for the heat exchanger. If you have an on-line UPS, it would need to be sized for the starting current of the motors, so 15kVA for a 5.5kW motor and maybe another small fan motor is not that unusual, in fact I would not go smaller. That addresses the size of the UPS, but the size of the battery bank is based on RUNNING load and time and i9s another matter altogether.

But another alternative would be a standby UPS system, which would assume the motors were started on normal power and are ALREADY running when power fails and the UPS transfers to feeding the loads (and why would they not be?). In that case the UPS would not need to handle the starting current and could be more closely sized to the actual load.

Thank u sir is it right if the motor under revolutionary condition that doesn't required more power to start than why it is required more power than its actual. s it is really good tip for me.

Alternate option to go for a VFD for 5.5 kW load and feed the VFD through a rated UPS, in your case may be a 7 to 7.5 kVA will be enough depending on the UPS manufacturer again.

good option thank u