![]() They can replace pilot devices and digital panel meters. Operator Interfaces are door mounted touchscreen computer displays that communicate with programmable logic controllers (PLC). ![]() ![]() They can include relays making it a controller and an analog output making it a signal conditioner. Digital Metersĭigital Meters are door mounted digital display that allows an operator to monitor analog process variables (Level, Pressure, Temperature, etc.). They come in many forms and colors Indicator Lights and Non-Illuminated and Illuminated Pushbuttons, Push-Pulls, Selector Switches. Pilot devices are door mounted manually operated electrical switches or indicators. See Best Panel Operator Devices for our recommendations. Below are the terms used to describe the major operator device types with a description of each. If you’re new to control panels, operator devices allow an operator to monitor and control the mechanical equipment attached to the control panel. They are flexible and allow communications but you need people with computer skills, programming tools (computer, software, cables, etc.) to program them to function properly in your application. PLCs are packaged in various forms and can range in price from under $100 to several thousand dollars. REPEAT CYCLE TIMER – contacts repeatedly change states (On / Off) when coil is energized.Ī PLC is a collection of components (relays, timers, etc.) in a package.ONE SHOT TIMER – contacts change to On state when coil is energized for ONE SHOT time setting.OFF TIMER – contacts change to Off state after OFF delay when coil is de-energized.ON TIMER – it’s contacts change to On state after ON delay when coil is energized.They are control relays with built-in timers to control when their contacts change state, and are used to turn other devices (contactors, pilot lights, etc.) on and off at specific times. Timing RelaysĪ Timing relay is the next simplest control device. It has a coil that can be energized (logical 1) and de-energized (logical 0) by an electrical voltage (120V, 24VDC, etc.) and contacts that change logic state based on its coil (logic input) state. Control relays are used to turn other devices like contactors, pilot lights, etc. Control RelaysĪ Control relay is the simplest electrical control device. See Electrical Control Components for beginners for more information. Below are the terms used to describe the major control component types with a description of each. Instead of simply ramping the motor voltage up or down like a soft start to turn the motor on and off, a VFD controls the motor speed at all times. A VFD is more expensive than a Soft Start (SS), but provides the added benefit of controlling motor speed.Ĭontrol panels use electrical panel components to control the logical operating sequence of physical equipment. Variable Frequency DrivesĪ Variable Frequency Drive (VFD) is an advanced solid state power controllers. Instead of simply opening and closing the power circuit like a motor contactor, it ramps the motor voltage up or down to turn the motor on and off more smoothly to eliminate electrical surges and mechanical shock. A Soft Start (SS) is more expensive than a motor contactor, but provides the added benefit of reducing electrical and mechanical shocks associated with starting and stopping a motor. Soft StartersĪ Soft Starter is a simple solid state motor power controller. It generally includes a Contactor and Overload Relay to control the motor, but they can be replaced by a Soft Starter or Variable Frequency Drive to improve motor control. ![]() Motor StartersĪ Motor Starter is a device or combination of devices (Circuit Breaker, Contactor, Overload Relay) used to power and control a motor. A fuse breaks the flow of electrical power by graceful self destruction. A fuse breaks the flow of electricity a when short circuit or overload causes the metal wire to literally burn up. A fuse is a thin metal wire in a sand packed paper wrapper. Fused DisconnectsĪ Fused Disconnect is the combination of a manual operated power switch and a fuse. Short circuit conditions are detected magnetically and overload conditions are detected thermally. Circuit BreakersĪ circuit breaker is a manually operated electrical power switch that can detect short circuit and overload conditions and turn itself Off when one of these conditions is detected. See Electrical Power Components for beginners for more information. These are power components. Below are the terms used to describe them with a description of each type.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |