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DISH SETUP: Single sat, Multi-Sat & Motorised
Ajak Patriot
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<blockquote data-quote="ArloG" data-source="post: 1164871" data-attributes="member: 418555"><p>Look at the load side. It must be for DC. And the load voltage rating should be in the ballpark also.</p><p>The basic concept is that AC SSR's switch on zero crossing of sine waves.. So <strong>no matter where in the load side of the AC phase relation is when control trigger is applied</strong>,. They switch on only when the sine wave crosses the positive AC excursion. And if the control voltage is removed, will still conduct until the waveform voltage drops to zero.</p><p></p><p>Great especially for 3-phase motors, as each stator winding will get power only when the phase rises to zero. "Soft Start" as it's known.</p><p>It may be subtle. But if you know what to listen for in especially 3-phase motors switched with SSR's. They start much smoother.</p><p>And typically last longer.</p><p></p><p>In extreme cases where a definite purpose 3-phase hard contact relay's contacts are worn. The motor it's hooked to will give a pronounced "grunt" or even try to start in reverse. If any 2 of the 3 contacts close first and it happens at the right point in the phasing, the motor gets a jolt in the opposite direction. Then the lagging set of contacts close and establishes the direction until the windings "catch-up" and turn it the right way....in kind of a violent jerk. Remember, you can reverse the direction of any 3-phase motor by simply switching any 2 stator wires.</p><p>I believe using an AC SSR used with DC will not switch off the triac until the load side voltage is removed.</p><p></p><p>They come in all flavors (notice I left out the never-needed "U")...imma wanker!</p><p>I've even seen some of the cube units with a red LED in a tiny hole on them to tell you when they are activated. And if you shine a flashlight (torch???) with enough IR into the window when not activated, they turn on.</p><p></p><p>The Opto DC60S-3 datasheet states it will turn on with 3 volts minimum voltage and turn off at 1 volt on the control side.</p><p>The exact same as the flat Crydom ones I have.</p><p></p><p>[ATTACH=full]157448[/ATTACH]</p></blockquote><p></p>
[QUOTE="ArloG, post: 1164871, member: 418555"] Look at the load side. It must be for DC. And the load voltage rating should be in the ballpark also. The basic concept is that AC SSR's switch on zero crossing of sine waves.. So [B]no matter where in the load side of the AC phase relation is when control trigger is applied[/B],. They switch on only when the sine wave crosses the positive AC excursion. And if the control voltage is removed, will still conduct until the waveform voltage drops to zero. Great especially for 3-phase motors, as each stator winding will get power only when the phase rises to zero. "Soft Start" as it's known. It may be subtle. But if you know what to listen for in especially 3-phase motors switched with SSR's. They start much smoother. And typically last longer. In extreme cases where a definite purpose 3-phase hard contact relay's contacts are worn. The motor it's hooked to will give a pronounced "grunt" or even try to start in reverse. If any 2 of the 3 contacts close first and it happens at the right point in the phasing, the motor gets a jolt in the opposite direction. Then the lagging set of contacts close and establishes the direction until the windings "catch-up" and turn it the right way....in kind of a violent jerk. Remember, you can reverse the direction of any 3-phase motor by simply switching any 2 stator wires. I believe using an AC SSR used with DC will not switch off the triac until the load side voltage is removed. They come in all flavors (notice I left out the never-needed "U")...imma wanker! I've even seen some of the cube units with a red LED in a tiny hole on them to tell you when they are activated. And if you shine a flashlight (torch???) with enough IR into the window when not activated, they turn on. The Opto DC60S-3 datasheet states it will turn on with 3 volts minimum voltage and turn off at 1 volt on the control side. The exact same as the flat Crydom ones I have. [ATTACH type="full" alt="1725136921602.jpeg"]157448[/ATTACH] [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Ajak Patriot
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