MR-BusIO-SSRACTM BusIO Solid State Relay BOARD User Manual GRAVITECH.US uResearch GRAVITECH GROUP Copyright (c) 2007 MicroResearch GRAVITECH GROUP WWW.GRAVITECH.US MR-BusIO-SSRACTM BusIO Solid State Relay BOARD User Manual Description The MR-BusIO-SSRAC is an experiment board for switching AC output voltage by using SSR (Solid State Relay). SSR is similar to mechanical relay that consists of inductor and surface contact. The internal structure of SSR uses semiconductor material to switching ON and OFF. The maximum controlling voltage is 400VAC at 6A. It is best for switching AC output voltage. The circuit is operating with AC voltage only. It is start when applying logic HIGH to an I/O pin. The indicator LED then illuminated which mean it is now close circuit. User can connect AC load up to 400VAC at 6A through output 2-PIN terminal block. In case of interfacing with inductance load such as motor, user should add Snubber circuit by putting R1 47ohm 1W resistor and C1 0.1uF 600V capacitor as shown in Figure 1. The board can be use with MR-BusIOMAIN board or stand-alone. PCB size is 0.63" x 2.80" Operation: General structure of SSR is shown in figure 1. Voltage applied to the input of an SSR causes the LED to shine on the photo-sensitive diode. The voltage is causing the TRIAC to turn on. FIG 1: General structure of SSR The board consists of MOC3042 IC which internally combined photo-coupler and zero crossing circuit together. The function of zero crossing circuit is to detect the voltage at zero point and supply current to the gate of the TRIAC. For 330ohm resistor and 0.1uF capacitor at the gate of the TRIAC, their function is sharing the current at the gate so they are not too high. Also, protect external noise into circuit. Copyright (c) 2007 MicroResearch GRAVITECH GROUP WWW.GRAVITECH.US MR-BusIO-SSRACTM BusIO Solid State Relay BOARD User Manual MR-BusIO-MAIN The MR-BusIO-MAIN is available for purchase via our website. If you don't see the item you need, please contract our sales department at sales@gravitech.us * MR-BusIO-MAIN Experiment board which receives output signals from any microcontrollers. The signals then distribute to daughter boards for each experiment. It designed to connect directly with 10PIN MRconnect(c). It is a quick and easy way to control up to 8 daughter boards. FIG 2: MR-BusIO-SSRAC Board Layout FIG 3: MR-BusIO-SSRAC Schematic Copyright (c) 2007 MicroResearch GRAVITECH GROUP WWW.GRAVITECH.US MR-BusIO-SSRACTM BusIO Solid State Relay BOARD User Manual Notes Contact Us We maintain a website where you can get information on our products, obtain literature and download support files. Visit us online at: WWW.GRAVITECH.US For sales questions or to place and order, direct your e-mails to sales@gravitech.us. Refer to our website for product pricing, shipping rates, payment instructions, and for other info we need to complete your order. Use our online Forum or e-mail your technical support questions to support@gravitech.us. We try to respond to your questions the same day. Disclaimer: MicroResearch reserves the right to modify its products or literature, or to discontinue any product at any time without prior notice. The customer is responsible for determining the suitability of any device for any application developed using MicroResearch components. Copyright (c) 2007 MicroResearch GRAVITECH GROUP WWW.GRAVITECH.US Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Gravitech: MR-BUSIO-SSRAC