CMX Series SIP SSR
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The document introduces solid state relays (SSRs) and Crydom's CMX series of DC output SSRs. It provides basic information on SSRs including their principle of operation, advantages over mechanical relays, and output types. It then describes the CMX series SSR product line, including part numbering, specifications, and applications.
CMX Series SIP SSR
- 1. CMX Series SIP SSR Source: Crydom
- 2. Introduction Purpose To introduce basic knowledge of solid state relays and CMX series DC output SSRs. Outline Basic knowledge of Solid State Relays (SSRs) CMX series overview CMX part numbering CMX applications Content 13 pages
- 3. What is a Solid State Relay (SSR)? An electronic switch made up of solid state components No mechanical contacts or moving parts
- 4. Principle of Operation The basic element of a SSR is the output switch. When S1 is closed The gate of SCR1 & SCR2 are connected. Current from AC supply through R1 or R2 and into the gate of whichever SCR is forward biased. The SSR is trigged into conduction. As long as S1 is closed, this action continues. When S2 is opened Whichever SCR is conducting continues to conduct until the next current zero. The SSR is turned off. Controlled Switch
- 5. Optically Controlled Switch Optical isolation is used to provide S1 function. Opto-transistor Opto-triac S1 Switch S1 Switch Fig 1 Opto-triac Control Fig 2 Opto-transistor Control
- 6. Advantages of SSRs Unlimited Life when properly selected and applied No moving contacts to burn, stick, arc, or bounce Very low input current required Very fast response time Ability to switch at AC zero-cross point or randomly Inherent characteristic of turn-off at zero current point No audible noise High surge current capability for severe inrush loads Capability to >1500 Apk for 1 cycle
- 7. Output of a SSR AC output Triac Single silicon chip device Switches both polarities of the AC line Dual SCRs 2 physically separate silicon devices connected in an inverse parallel configuration Much better dv/dt ratings than the Triac DC output Bi-polar Transistor Economical, but drawbacks include relatively slow turn-off and high power dissipation. MOSFET With very low Rds-on values available, & less internal heating is produced. MOSFET based SSR’s can be easily paralleled for very large current loads.
- 8. CMX PCB Mount SSRs DC output SSRs – MOSFET output Ratings up to 10ADC @ 200VDC Low off-state leakage current Pinout compatible with all standard I/O module boards Low on-state impedance for reduces power dissipations
- 9. Family Members CMX 100 D 6 Series name Max operating Voltage Max Load Current Product Control Voltage Maximum Load Current Line Voltage Range CMX100D6 3-10 VDC 6 Amps 0-100 VDC CMX100D10 3-10 VDC 10 Amps 0-100 VDC CMX200D3 4-10 VDC 3 Amps 0-200 VDC CMX60D10 3-10 VDC 10 Amps 0-60 VDC CMX60D20 3-10 VDC 20 Amps 0-60 VDC CMX60D5 3-10 VDC 5 Amps 0-60 VDC
- 10. Relay Connections CMX Sink Input, Source Output Sink Input, Sink Output Source Input, Source Output Source Input, Sink Output
- 12. Target Applications? Heating Lighting Motion control Medical equipment Industrial Automation HVAC Oil Services Food Processing
- 13. Additional Resource For ordering CMX SSRs, please click the part list or Call our sales hotline For more product information go to Cyrdom CMX Series SIP SSR Visit Element 14 to post your question www.element-14.com For additional inquires contact our technical service hotline or even use our “Live Technical Chat” online facility Newark Farnell
Editor's Notes
- #2: Welcome to the training module on CMX Series SIP SSR.
- #3: Welcome to the training module on CMX Series SIP SSR. This training module will introduce basic knowledge of solid state relays and CMX series DC output SSRs.
- #4: Solid state relays (SSRs) have been around for over 30 years, they were invented by Crydom engineers in 1972. A solid state relay is an electronic switch made up of solid state components. There are no mechanical contacts or moving parts inside the SSRs.
- #5: This output switch is the key part of a solid state relay, it is the component which does the work. AC output solid state relays are normally powered by the AC line itself. This is accomplished by connecting the two gates of the output SCRs together, through a controlled switch. This basic control is shown in the figure. When S1 is closed the gates of SCR1 and SCR2 are connected, current from the AC supply flows through either R1 or R2 and into the gate of whichever SCR is forward biased, this turns the SCR on and the relay conducts. As long as S1 is closed, this action continues, reversing every half cycle of the AC supply. When S1 is opened, the SCR presently in conduction will continue to conduct until the zero current point is reached and the SSR will be off.
- #6: The SSR uses optical isolation to provide S1 function. There are two optical isolation methods to provide excellent isolation between control and output of the SSR. One is opto-transistor circuit shown in Fig 2, another is opto-triac control circuit shown in Fig 1. The opto-transistor circuit requires less control current to operate, and it allows the manufacturer to modify the control circuit characteristics in terms of zero cross voltage window, noise suppression etc. The opto-triac circuit generally requires a higher control current for satisfactory operation.
- #7: Compared to electro mechanical relays, solid state relays have a few advantages. For example, when properly selected and applied, the SSRs have unlimited life. Other advantages include no moving contacts to burn, stick, arc, or bounce, very low input current required, very fast response time, ability to switch at AC zero-cross point or randomly, inherent characteristic of turn-off at zero current point, no audible noise, and high surge current capability for severe inrush loads.
- #8: Solid state relays have either a DC or AC control. For AC control the AC signal is rectified and filtered to provide DC to the opto-transistor or opto-triac LED. In most cases Crydom uses dual SCRs configuration as the output elements of its AC output solid state relays. However, DC output solid state relays are being used more and more widely. One of the major reasons for the use of solid state relays for switching DC is the fact that as there are no moving parts, no contact arcing or wear out mechanism. However, there are some precautions which have to be taken when using solid state relays with inductive DC loads.
- #9: Let’s take a close look at CMX series SSR for better understanding. CMX series are high power PCB mounted DC output SSR. They feature outputs with low on-state resistance FETs for efficient DC load control, 2500 VAC optical isolation, logic compatible DC control input and industry standard PCB mounting footprint in an epoxy package designed for full output rated operation at 40°C ambient temperature.
- #10: Here lists the products under CMX series with their electrical specification and part numbering.
- #11: Because the input and output terminals of CMX SSR are electrically isolated by up to 2,500 Vrms, the relative positions of the input signal and load connections are irrelevant. As shown in the figure, the input can be supplied either from a source or sink configuration and the load can be connected to either the relay positive or negative output terminals. The solid state relay can be used as a level shifter because no electrical relationship is required between the control and power output sections of the relay.
- #12: Due to the forward voltage drop, SSRs generate an internal power loss that is a function of the load current. To determine what an adequate heatsink system is for a particular application without going through the calculations, derating curves are provided for each specific SSR that were generated using the specification data, and verified through extensive testing. The derating curves can determine any of the variables that the system designer wants to deal with.
- #13: The CMX DC output SSRs are ideal for heating, lighting and motion control applications in industrial, medical, aerospace, rail, and automotive applications.
- #14: Thank you for taking the time to view this presentation on “ CMX Series SIP SSR” . If you would like to learn more or go on to purchase some of these devices, you may either click on the part list link, or simply call our sales hotline. For more technical information you may either visit the Crydom site, or if you would prefer to speak to someone live, please call our hotline number, or even use our ‘live chat’ online facility. You may visit Element 14 e-community to post your questions.