There are some tests that must be performed at the installation site, after the assembly of the equipment. These tests are called Site Acceptance Test (SAT). It's probably the equipment suffered damage during assembly, transport and editing at the customer's / user's location. Therefore, these tests are performed to prove that it functions properly in its operating environment.
After successfully completing the SAT, the machine can be qualified (the process of proving that the subject equipment or system is working properly and continuously produce the expected results) and put into service.