Читать книгу Automation of Water Resource Recovery Facilities - Water Environment Federation - Страница 78

Elementary wiring diagrams illustrate how a specific piece of equipment will be controlled electrically. The design team should create a separate wiring diagram for each piece of control system equipment. If there are several identical pieces of equipment, one typical drawing can be created with an accompanying chart to identify the respective applicable equipment numbers and any unique characteristics. The diagrams should include selector switches, pushbuttons, lamps, relays, fuses, and field devices (e.g., solenoids and sensors/transmitters for flow, temperature, pressure, level, or other devices with switch outputs that are wired into the circuit) and indicate if contacts are momentary or maintained. Inputs to the control system should be shown for clarity and complete identification of required interfaces with other systems (i.e., motor control centers, motor-operated valves, variable-frequency drives [VFDs], digital inputs to PLCs and DCS, etc.). Outputs from the remote control system must be shown in all instances.