Читать книгу Automation of Water Resource Recovery Facilities - Water Environment Federation - Страница 107

Before the witnessed factory test, the instrumentation system supplier should perform a full-system test, during which the entire system must operate continuously for at least 100 hours without failure, in accordance with the requirements of the specifications and drawings. The purpose of this test is to ensure that any component failures are discovered before the witnessed factory test begins.

This test should verify that all the components work properly as an integrated system. It involves assembling the entire control system (i.e., hardware, software, peripheral devices, and interconnecting cables) on the factory test floor and using a workstation loaded with simulation software (simple control systems can typically be verified without simulation software) to operate the control system and simulate both treatment processes and signals from field devices that cannot be connected to the panel. If any component fails during this test, it should be replaced and the test restarted.

While the entire system is assembled, the supplier should inspect all panels, consoles, and cabinets to ensure that the following items and functions are correct and consistent:

• Nameplates and tags;

• Wire sizes and color coding;

• Terminal block contract ratings and number;

• Annunciator and terminal block spares;

• Proper wiring practices and grounding; and

• Enclosure flatness, finish, and color.

Once the 100-hour test has been successfully completed, the contractor should certify this success in writing, submit the document to the design engineer, and schedule witness testing.