Burgers are very easy to grill and you can make your patties if you want to grill burgers on pellet grill. Find online how to mix up ingredients and how to choose the best meat for the patty.
Preheat your smoker.
Set your smoker to about 425 to 450 degrees F.Top up the hopper with more pellet if necessary. The most preferred wood for burgers is hickory.
Put the patties into the grate to grill.
Once 450 degrees is reached, arrange the patties along the grate, close the lid and let them cook for about 8 to 9 minutes. After 9 minutes, flip the patties and add again 8 to 9 minutes. If you have a thermometer probe, probe one patty in the middle. If the temperature reaches 160 degrees, this means all of your patties are cooked. 
Follow the temperature setting.
As an additional tip, if you want your burgers to be cooked medium, you can set the thermostat of the pellet grill after preheating it to 160 degrees only. Or if you want your burgers to be cooked rare, set it to 140 degrees F. You can also observe that when the patties are fully cooked they may change color on top with a bit of the pinkish color when you slice it up and that is basically the smoke ring.
Add your favorite fixing.
It’s up to you now what kind of fixing you want for your burgers. You can put bacon or onion or barbecue sauce on top. Or you can also put cheese on top of each patty while these patties are cooking and this will melt and add flavor and moisture to your burger.