I have summit commercial freezer with embraco emi 60her when turn the power on, fan start run then compressor start run about 30 second the trip the compressor. ans i can not see any run or start capacitor.

SOURCE: Freezer Not Cooling

Sounds like the low pressure cutout switch is stopping your compressor running, especially if the "5 seconds" you mention are exactly the same length each time. Not enough refrigerant would be the usual cause, but the reason for the refrigerant loss is harder to tie down - possibly a seal or a loose valve seat or even a pinhole in a copper tube. Best solution now would be to get a refrigerator mechanic to top it up and check for leaks - get a quote first to check - 'fridge gas is getting costly. Other possible solution is that the low pressure switch itself is faulty, relatively inexpensive to replace (but unfortunately you will need at least a partial gas recharge on most types of system after) - your fridge gas guy will be able to check very easily if there is adequate gas in the system, and should check this low pressure switch if there is not. Usually this is fixable many times, just check the cost first. Hope this helps :)

SOURCE: Whirlpool ev200nxr upright freezer not cooling.

It is most likely the relay and overload or the thermostat.  What is the complete model # on the sticker inside the freezer?

SOURCE: walk-in norlake freezer

Check the evaporator coil for frost buildup on the back. Check for frost on the suction line, the biggest line returning to the compressor. If frost is evident at these places you have a defrost system problem. These systems have a defrost timer that defrosts the coil at preset times. Check the timer for proper operation by marking the position of the dial and check back to see if it changes. If it does not change position the timer motor is most likely bad. If the dial is not rotating automatically you can manually turn the dial in the direction of the arrow and put it through a defrost cycle.

SOURCE: kenmore upright freezer

No it is not the timer. You may have an open overload protector at the compressor. Check across the overload for a reading with an ohm meter. If it reads zero it is good, if not replace it.

SOURCE: freezer fan on compressor off

They make generic "compressor packs" to solve these. Your capacitors and relay and parts that support the compressor operation went out.

If you're really really like just the temp overload switch went and you can jumper bypass it. It usually looks like a piezo electric type of disc connected right onto the comp case itself.

But you're right with the DT, the motors go out on them a lot. They are usually for 4/6/10/12 hours depending on make and model. Sometimes the contacts go So if you could isolate them... they're on the larger side and will go from the power to the compressor. Use a jumper and test for a complete circuit to the plug and through the compressor before trying it.

By law all freezers and ovens have to have a schematic diagram on them. Often it it in a little plastic package and sometimes just wallpapered to the inside of a large piece of sheetmetal in back.

Good that you know how to use a meter!