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OT. Solid state relay switching others
Can a solid state relay switch other solid state relays? Anything
to watch other than to wire them up? I didn't spend a lot of time looking but didn't see an answer to this question. The solid state relays seemed like an answer to a problem I had to solve. The switching ssr needs to operate two others. One is a quarter mile away, the second is a half mile away. Thanks, Gentlemen |
OT. Solid state relay switching others
On Wednesday, August 2, 2017 at 8:53:22 PM UTC-5, Dean Hoffman wrote:
Can a solid state relay switch other solid state relays? Anything to watch other than to wire them up? I didn't spend a lot of time looking but didn't see an answer to this question. The solid state relays seemed like an answer to a problem I had to solve. The switching ssr needs to operate two others. One is a quarter mile away, the second is a half mile away. Thanks, Gentlemen Who are you calling Gentlemen? I don't see why the solid state relay couldn't switch on other solid state relays. What type of relays are you considering for your project? What voltages and current will you be switching? AC or DC voltages? You might also consider putting lightning protection on your control cable. Another thing you may consider would be wireless control signals to cover the distance. I did a lot of control system work and solid state relays are a mature technology with many choices as to what voltages and current the relays will handle plus what voltages AC or DC will trigger them. ヽ(ヅ)ノ [8~{} Uncle Triggered Monster |
OT. Solid state relay switching others
On 08/02/2017 09:53 PM, Dean Hoffman wrote:
Can a solid state relay switch other solid state relays? Anything to watch other than to wire them up? I didn't spend a lot of time looking but didn't see an answer to this question. The solid state relays seemed like an answer to a problem I had to solve. The switching ssr needs to operate two others. One is a quarter mile away, the second is a half mile away. Thanks, Gentlemen Worst case maybe put a small resistive dummy load on the output of the switching ssr? |
OT. Solid state relay switching others
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OT. Solid state relay switching others
On 08/02/2017 08:53 PM, Dean Hoffman wrote:
Can a solid state relay switch other solid state relays? Anything to watch other than to wire them up? I didn't spend a lot of time looking but didn't see an answer to this question. The solid state relays seemed like an answer to a problem I had to solve. The switching ssr needs to operate two others. One is a quarter mile away, the second is a half mile away. Thanks, Gentlemen I have done that in my holiday light control for about 5 years. A small computer (Arduino) controls 3 small SSRs (switching 12VDC). The load on the output is a few larger SSRs that switch 120V for the lights. BTW, "off" is not entirely off. It's close enough that incandescent lights won't light, but if the load is only small LED lights, they may no go completely off. I still have a few incandescents. -- Mark Lloyd http://notstupid.us/ "By simple common sense, I don't believe in God." -- Charlie Chaplin |
OT. Solid state relay switching others
On 08/03/2017 03:49 AM, Lowell Mather wrote:
[snip] Worst case maybe put a small resistive dummy load on the output of the switching ssr? For what I have, I didn't need such a load on the first SSRs (the ones that control others), only on the second SSRs if I just want to switch LED lights. -- Mark Lloyd http://notstupid.us/ "By simple common sense, I don't believe in God." -- Charlie Chaplin |
OT. Solid state relay switching others
On 8/3/17 3:38 AM, Uncle Monster wrote:
On Wednesday, August 2, 2017 at 8:53:22 PM UTC-5, Dean Hoffman wrote: Can a solid state relay switch other solid state relays? Anything to watch other than to wire them up? I didn't spend a lot of time looking but didn't see an answer to this question. The solid state relays seemed like an answer to a problem I had to solve. The switching ssr needs to operate two others. One is a quarter mile away, the second is a half mile away. Thanks, Gentlemen Who are you calling Gentlemen? I don't see why the solid state relay couldn't switch on other solid state relays. What type of relays are you considering for your project? What voltages and current will you be switching? AC or DC voltages? You might also consider putting lightning protection on your control cable. Another thing you may consider would be wireless control signals to cover the distance. I did a lot of control system work and solid state relays are a mature technology with many choices as to what voltages and current the relays will handle plus what voltages AC or DC will trigger them. ヽ (ヅ)ノ [8~{} Uncle Triggered Monster I need/want to stay under 30 volts for the control voltage. The code will let us do that without grounding and interlocks on the panels where the controlled relays are mounted. The reason for the DC is those seem to be much more common. Plan A was a master ssr at the center point of an irrigation system. It would be activated by 12vdc from an irrigation engine located in the northeast corner of a field. Eighteen hundred feet away give or take. The masters output would be supplied by 24vdc. The load was to have been the two slave solid state relays. The first slave would've been in a well panel straight north of the master about thirteen hundred feet away. The second slave would've been in a well panel about thirteen hundred feet west of the first slave. The slaves would've been switching power to a 480vac three phase motor starter. They'd have had about 240vac through them. The supply house sent zero point switching ssrs. Control voltage is 4-32vdc. Output 600 vac. I think that might have been a problem with the 3 phase. They didn't work every time, either off or on. I solved that perceived problem with a 480x120 transformer. The slave ssrs are now switching single phase 120 going to a mechanical relay. That relay runs the pump starter. The problem now is the slaves won't obey the master. My guess was they don't impose enough of a load on the master. I must be on the right track judging from the other responses. Someone else buried the pipe and wire long ago. The wire is 12 uf with ground. Our customer asked us to make the irrigation system kill the wells and any failure kill the other three parts of the group. Three wells are supplying water to one center pivot at a time. I'm used to mechanical relays, switches, and contactors. Those won't work due to the voltage drop. Any ideas? |
OT. Solid state relay switching others
On Thu, 3 Aug 2017 19:19:36 -0500, Dean Hoffman
wrote: On 8/3/17 3:38 AM, Uncle Monster wrote: On Wednesday, August 2, 2017 at 8:53:22 PM UTC-5, Dean Hoffman wrote: Can a solid state relay switch other solid state relays? Anything to watch other than to wire them up? I didn't spend a lot of time looking but didn't see an answer to this question. The solid state relays seemed like an answer to a problem I had to solve. The switching ssr needs to operate two others. One is a quarter mile away, the second is a half mile away. Thanks, Gentlemen Who are you calling Gentlemen? I don't see why the solid state relay couldn't switch on other solid state relays. What type of relays are you considering for your project? What voltages and current will you be switching? AC or DC voltages? You might also consider putting lightning protection on your control cable. Another thing you may consider would be wireless control signals to cover the distance. I did a lot of control system work and solid state relays are a mature technology with many choices as to what voltages and current the relays will handle plus what voltages AC or DC will trigger them. ? (?)? [8~{} Uncle Triggered Monster I need/want to stay under 30 volts for the control voltage. The code will let us do that without grounding and interlocks on the panels where the controlled relays are mounted. The reason for the DC is those seem to be much more common. Plan A was a master ssr at the center point of an irrigation system. It would be activated by 12vdc from an irrigation engine located in the northeast corner of a field. Eighteen hundred feet away give or take. The masters output would be supplied by 24vdc. The load was to have been the two slave solid state relays. The first slave would've been in a well panel straight north of the master about thirteen hundred feet away. The second slave would've been in a well panel about thirteen hundred feet west of the first slave. The slaves would've been switching power to a 480vac three phase motor starter. They'd have had about 240vac through them. The supply house sent zero point switching ssrs. Control voltage is 4-32vdc. Output 600 vac. I think that might have been a problem with the 3 phase. They didn't work every time, either off or on. I solved that perceived problem with a 480x120 transformer. The slave ssrs are now switching single phase 120 going to a mechanical relay. That relay runs the pump starter. The problem now is the slaves won't obey the master. My guess was they don't impose enough of a load on the master. I must be on the right track judging from the other responses. Someone else buried the pipe and wire long ago. The wire is 12 uf with ground. Our customer asked us to make the irrigation system kill the wells and any failure kill the other three parts of the group. Three wells are supplying water to one center pivot at a time. I'm used to mechanical relays, switches, and contactors. Those won't work due to the voltage drop. Any ideas? I use SSRs a lot. You do need a little bit of a resistive load to make them turn off reliably but 15w of incandescent light seems to work OK. Typically they look like a 1000 ohm resistor so at 5v they draw about 5ma. (maybe more like 24ma at 24v) Voltage drop should not be a problem no matter what tho since the range is so wide. Just for gee whiz info 12ga wire at 1800 feet carrying a half an amp only drops 3.6v or so. Just be sure you have clean DC (no ripple). Typical transformer wall warts suck without adding a fat filter capacitor. but a switcher is OK. If you put a lamp (or just a resistor) for a load at the first SSR and the irrigation for the load at the slaves you should be fine. |
OT. Solid state relay switching others
On Thursday, August 3, 2017 at 7:19:43 PM UTC-5, Dean Hoffman wrote:
On 8/3/17 3:38 AM, Uncle Monster wrote: On Wednesday, August 2, 2017 at 8:53:22 PM UTC-5, Dean Hoffman wrote: Can a solid state relay switch other solid state relays? Anything to watch other than to wire them up? I didn't spend a lot of time looking but didn't see an answer to this question. The solid state relays seemed like an answer to a problem I had to solve. The switching ssr needs to operate two others. One is a quarter mile away, the second is a half mile away. Thanks, Gentlemen Who are you calling Gentlemen? I don't see why the solid state relay couldn't switch on other solid state relays. What type of relays are you considering for your project? What voltages and current will you be switching? AC or DC voltages? You might also consider putting lightning protection on your control cable. Another thing you may consider would be wireless control signals to cover the distance. I did a lot of control system work and solid state relays are a mature technology with many choices as to what voltages and current the relays will handle plus what voltages AC or DC will trigger them. ヽ (ヅ)ノ [8~{} Uncle Triggered Monster I need/want to stay under 30 volts for the control voltage. The code will let us do that without grounding and interlocks on the panels where the controlled relays are mounted. The reason for the DC is those seem to be much more common. Plan A was a master ssr at the center point of an irrigation system. It would be activated by 12vdc from an irrigation engine located in the northeast corner of a field. Eighteen hundred feet away give or take. The masters output would be supplied by 24vdc. The load was to have been the two slave solid state relays. The first slave would've been in a well panel straight north of the master about thirteen hundred feet away. The second slave would've been in a well panel about thirteen hundred feet west of the first slave. The slaves would've been switching power to a 480vac three phase motor starter. They'd have had about 240vac through them. The supply house sent zero point switching ssrs. Control voltage is 4-32vdc. Output 600 vac. I think that might have been a problem with the 3 phase. They didn't work every time, either off or on. I solved that perceived problem with a 480x120 transformer. The slave ssrs are now switching single phase 120 going to a mechanical relay. That relay runs the pump starter. The problem now is the slaves won't obey the master. My guess was they don't impose enough of a load on the master. I must be on the right track judging from the other responses. Someone else buried the pipe and wire long ago. The wire is 12 uf with ground. Our customer asked us to make the irrigation system kill the wells and any failure kill the other three parts of the group. Three wells are supplying water to one center pivot at a time. I'm used to mechanical relays, switches, and contactors. Those won't work due to the voltage drop. Any ideas? There are solid state relays that have a wide voltage range to trigger them.. The thing I'd be most worried about is what would happen to your control system when there is a nearby lightning strike. If you're running a very long control cable to low voltage triggered solid state relays, the induced voltage surge on the control cable could burn out your relays. If there is electrical power at your remote pumps, consider wireless control. ヽ(ヅ)ノ http://www.remotecontroltech.com/ [8~{} Uncle Uncontrollable Monster |
OT. Solid state relay switching others
On Fri, 4 Aug 2017 05:27:19 -0700 (PDT), Uncle Monster
wrote: On Thursday, August 3, 2017 at 7:19:43 PM UTC-5, Dean Hoffman wrote: On 8/3/17 3:38 AM, Uncle Monster wrote: On Wednesday, August 2, 2017 at 8:53:22 PM UTC-5, Dean Hoffman wrote: Can a solid state relay switch other solid state relays? Anything to watch other than to wire them up? I didn't spend a lot of time looking but didn't see an answer to this question. The solid state relays seemed like an answer to a problem I had to solve. The switching ssr needs to operate two others. One is a quarter mile away, the second is a half mile away. Thanks, Gentlemen Who are you calling Gentlemen? I don't see why the solid state relay couldn't switch on other solid state relays. What type of relays are you considering for your project? What voltages and current will you be switching? AC or DC voltages? You might also consider putting lightning protection on your control cable. Another thing you may consider would be wireless control signals to cover the distance. I did a lot of control system work and solid state relays are a mature technology with many choices as to what voltages and current the relays will handle plus what voltages AC or DC will trigger them. ? (?)? [8~{} Uncle Triggered Monster I need/want to stay under 30 volts for the control voltage. The code will let us do that without grounding and interlocks on the panels where the controlled relays are mounted. The reason for the DC is those seem to be much more common. Plan A was a master ssr at the center point of an irrigation system. It would be activated by 12vdc from an irrigation engine located in the northeast corner of a field. Eighteen hundred feet away give or take. The masters output would be supplied by 24vdc. The load was to have been the two slave solid state relays. The first slave would've been in a well panel straight north of the master about thirteen hundred feet away. The second slave would've been in a well panel about thirteen hundred feet west of the first slave. The slaves would've been switching power to a 480vac three phase motor starter. They'd have had about 240vac through them. The supply house sent zero point switching ssrs. Control voltage is 4-32vdc. Output 600 vac. I think that might have been a problem with the 3 phase. They didn't work every time, either off or on. I solved that perceived problem with a 480x120 transformer. The slave ssrs are now switching single phase 120 going to a mechanical relay. That relay runs the pump starter. The problem now is the slaves won't obey the master. My guess was they don't impose enough of a load on the master. I must be on the right track judging from the other responses. Someone else buried the pipe and wire long ago. The wire is 12 uf with ground. Our customer asked us to make the irrigation system kill the wells and any failure kill the other three parts of the group. Three wells are supplying water to one center pivot at a time. I'm used to mechanical relays, switches, and contactors. Those won't work due to the voltage drop. Any ideas? There are solid state relays that have a wide voltage range to trigger them. The thing I'd be most worried about is what would happen to your control system when there is a nearby lightning strike. If you're running a very long control cable to low voltage triggered solid state relays, the induced voltage surge on the control cable could burn out your relays. If there is electrical power at your remote pumps, consider wireless control. ?(?)? http://www.remotecontroltech.com/ [8~{} Uncle Uncontrollable Monster I think the lightning problem can be mitigated with some big MOVs kicking off at 30v or so. Since SSRs are, by there nature, isolation devices you do not have a direct path. I would also loop the leads through some big ferrites but other than that it is not a big worry. Lightning surges are generally common mode transients. SSRs are cheap and pretty tough. Just keep spares and worry about the lightning problem when you see it is a problem. |
OT. Solid state relay switching others
On Friday, August 4, 2017 at 10:02:53 AM UTC-5, wrote:
On Fri, 4 Aug 2017 05:27:19 -0700 (PDT), Uncle Monster wrote: On Thursday, August 3, 2017 at 7:19:43 PM UTC-5, Dean Hoffman wrote: On 8/3/17 3:38 AM, Uncle Monster wrote: On Wednesday, August 2, 2017 at 8:53:22 PM UTC-5, Dean Hoffman wrote: Can a solid state relay switch other solid state relays? Anything to watch other than to wire them up? I didn't spend a lot of time looking but didn't see an answer to this question. The solid state relays seemed like an answer to a problem I had to solve. The switching ssr needs to operate two others. One is a quarter mile away, the second is a half mile away. Thanks, Gentlemen Who are you calling Gentlemen? I don't see why the solid state relay couldn't switch on other solid state relays. What type of relays are you considering for your project? What voltages and current will you be switching? AC or DC voltages? You might also consider putting lightning protection on your control cable. Another thing you may consider would be wireless control signals to cover the distance. I did a lot of control system work and solid state relays are a mature technology with many choices as to what voltages and current the relays will handle plus what voltages AC or DC will trigger them. ? (?)? [8~{} Uncle Triggered Monster I need/want to stay under 30 volts for the control voltage. The code will let us do that without grounding and interlocks on the panels where the controlled relays are mounted. The reason for the DC is those seem to be much more common. Plan A was a master ssr at the center point of an irrigation system. It would be activated by 12vdc from an irrigation engine located in the northeast corner of a field. Eighteen hundred feet away give or take. The masters output would be supplied by 24vdc. The load was to have been the two slave solid state relays. The first slave would've been in a well panel straight north of the master about thirteen hundred feet away. The second slave would've been in a well panel about thirteen hundred feet west of the first slave. The slaves would've been switching power to a 480vac three phase motor starter. They'd have had about 240vac through them. The supply house sent zero point switching ssrs. Control voltage is 4-32vdc. Output 600 vac. I think that might have been a problem with the 3 phase. They didn't work every time, either off or on. I solved that perceived problem with a 480x120 transformer. The slave ssrs are now switching single phase 120 going to a mechanical relay. That relay runs the pump starter. The problem now is the slaves won't obey the master. My guess was they don't impose enough of a load on the master. I must be on the right track judging from the other responses. Someone else buried the pipe and wire long ago. The wire is 12 uf with ground. Our customer asked us to make the irrigation system kill the wells and any failure kill the other three parts of the group. Three wells are supplying water to one center pivot at a time. I'm used to mechanical relays, switches, and contactors. Those won't work due to the voltage drop. Any ideas? There are solid state relays that have a wide voltage range to trigger them. The thing I'd be most worried about is what would happen to your control system when there is a nearby lightning strike. If you're running a very long control cable to low voltage triggered solid state relays, the induced voltage surge on the control cable could burn out your relays. If there is electrical power at your remote pumps, consider wireless control. ?(?)? http://www.remotecontroltech.com/ [8~{} Uncle Uncontrollable Monster I think the lightning problem can be mitigated with some big MOVs kicking off at 30v or so. Since SSRs are, by there nature, isolation devices you do not have a direct path. I would also loop the leads through some big ferrites but other than that it is not a big worry. Lightning surges are generally common mode transients. SSRs are cheap and pretty tough. Just keep spares and worry about the lightning problem when you see it is a problem. If I was doing the control lines I'd use what I used to protect telecom lines but there are protectors made for low voltage control cables but I still think a wireless solution should be considered. ヽ(ヅ)ノ http://www.l-com.com/surge-protector...rge-protectors [8~{} Uncle Surging Monster |
OT. Solid state relay switching others
On Fri, 4 Aug 2017 08:30:01 -0700 (PDT), Uncle Monster
wrote: On Friday, August 4, 2017 at 10:02:53 AM UTC-5, wrote: On Fri, 4 Aug 2017 05:27:19 -0700 (PDT), Uncle Monster wrote: On Thursday, August 3, 2017 at 7:19:43 PM UTC-5, Dean Hoffman wrote: On 8/3/17 3:38 AM, Uncle Monster wrote: On Wednesday, August 2, 2017 at 8:53:22 PM UTC-5, Dean Hoffman wrote: Can a solid state relay switch other solid state relays? Anything to watch other than to wire them up? I didn't spend a lot of time looking but didn't see an answer to this question. The solid state relays seemed like an answer to a problem I had to solve. The switching ssr needs to operate two others. One is a quarter mile away, the second is a half mile away. Thanks, Gentlemen Who are you calling Gentlemen? I don't see why the solid state relay couldn't switch on other solid state relays. What type of relays are you considering for your project? What voltages and current will you be switching? AC or DC voltages? You might also consider putting lightning protection on your control cable. Another thing you may consider would be wireless control signals to cover the distance. I did a lot of control system work and solid state relays are a mature technology with many choices as to what voltages and current the relays will handle plus what voltages AC or DC will trigger them. ? (?)? [8~{} Uncle Triggered Monster I need/want to stay under 30 volts for the control voltage. The code will let us do that without grounding and interlocks on the panels where the controlled relays are mounted. The reason for the DC is those seem to be much more common. Plan A was a master ssr at the center point of an irrigation system. It would be activated by 12vdc from an irrigation engine located in the northeast corner of a field. Eighteen hundred feet away give or take. The masters output would be supplied by 24vdc. The load was to have been the two slave solid state relays. The first slave would've been in a well panel straight north of the master about thirteen hundred feet away. The second slave would've been in a well panel about thirteen hundred feet west of the first slave. The slaves would've been switching power to a 480vac three phase motor starter. They'd have had about 240vac through them. The supply house sent zero point switching ssrs. Control voltage is 4-32vdc. Output 600 vac. I think that might have been a problem with the 3 phase. They didn't work every time, either off or on. I solved that perceived problem with a 480x120 transformer. The slave ssrs are now switching single phase 120 going to a mechanical relay. That relay runs the pump starter. The problem now is the slaves won't obey the master. My guess was they don't impose enough of a load on the master. I must be on the right track judging from the other responses. Someone else buried the pipe and wire long ago. The wire is 12 uf with ground. Our customer asked us to make the irrigation system kill the wells and any failure kill the other three parts of the group. Three wells are supplying water to one center pivot at a time. I'm used to mechanical relays, switches, and contactors. Those won't work due to the voltage drop. Any ideas? There are solid state relays that have a wide voltage range to trigger them. The thing I'd be most worried about is what would happen to your control system when there is a nearby lightning strike. If you're running a very long control cable to low voltage triggered solid state relays, the induced voltage surge on the control cable could burn out your relays. If there is electrical power at your remote pumps, consider wireless control. ?(?)? http://www.remotecontroltech.com/ [8~{} Uncle Uncontrollable Monster I think the lightning problem can be mitigated with some big MOVs kicking off at 30v or so. Since SSRs are, by there nature, isolation devices you do not have a direct path. I would also loop the leads through some big ferrites but other than that it is not a big worry. Lightning surges are generally common mode transients. SSRs are cheap and pretty tough. Just keep spares and worry about the lightning problem when you see it is a problem. If I was doing the control lines I'd use what I used to protect telecom lines but there are protectors made for low voltage control cables but I still think a wireless solution should be considered. ?(?)? http://www.l-com.com/surge-protector...rge-protectors [8~{} Uncle Surging Monster Why would I buy a $40 protector to protect a $10 SSR? Particularly since you are just protecting a LED If there was a CMOS front end in there I would worry about it but if the hit was strong enough to take out a LED, that protector will be smoking too. |
OT. Solid state relay switching others
On 8/4/17 7:27 AM, Uncle Monster wrote:
Cut a bunch. There are solid state relays that have a wide voltage range to trigger them. The thing I'd be most worried about is what would happen to your control system when there is a nearby lightning strike. If you're running a very long control cable to low voltage triggered solid state relays, the induced voltage surge on the control cable could burn out your relays. If there is electrical power at your remote pumps, consider wireless control. ヽ(ヅ)ノ http://www.remotecontroltech.com/ [8~{} Uncle Uncontrollable Monster The last link in this hookup will have to be wireless due to lack of buried wires. http://www.valleyirrigation.com/valley-irrigation/us/irrigation-products/pumping-solutions/pump-connect or http://alturl.com/cv3tb My bosses sell these so I suppose I'm stuck with them even if there are a 100 better options. Cost would be a big issue. |
OT. Solid state relay switching others
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OT. Solid state relay switching others
On Friday, August 4, 2017 at 6:27:00 PM UTC-5, Dean Hoffman wrote:
On 8/4/17 7:27 AM, Uncle Monster wrote: Cut a bunch. There are solid state relays that have a wide voltage range to trigger them. The thing I'd be most worried about is what would happen to your control system when there is a nearby lightning strike. If you're running a very long control cable to low voltage triggered solid state relays, the induced voltage surge on the control cable could burn out your relays. If there is electrical power at your remote pumps, consider wireless control. ヽ(ヅ)ノ http://www.remotecontroltech.com/ [8~{} Uncle Uncontrollable Monster The last link in this hookup will have to be wireless due to lack of buried wires. http://www.valleyirrigation.com/valley-irrigation/us/irrigation-products/pumping-solutions/pump-connect or http://alturl.com/cv3tb My bosses sell these so I suppose I'm stuck with them even if there are a 100 better options. Cost would be a big issue. How expensive is it for your company to have to run a service call to repair something damaged by lightning or a power surge? Do you try to protect the equipment at all? ヽ(ヅ)ノ [8~{} Uncle Expensive Monster |
OT. Solid state relay switching others
On 8/4/17 6:56 PM, Uncle Monster wrote:
On Friday, August 4, 2017 at 6:27:00 PM UTC-5, Dean Hoffman wrote: On 8/4/17 7:27 AM, Uncle Monster wrote: Cut a bunch. There are solid state relays that have a wide voltage range to trigger them. The thing I'd be most worried about is what would happen to your control system when there is a nearby lightning strike. If you're running a very long control cable to low voltage triggered solid state relays, the induced voltage surge on the control cable could burn out your relays. If there is electrical power at your remote pumps, consider wireless control. ヽ(ヅ)ノ http://www.remotecontroltech.com/ [8~{} Uncle Uncontrollable Monster The last link in this hookup will have to be wireless due to lack of buried wires. http://www.valleyirrigation.com/valley-irrigation/us/irrigation-products/pumping-solutions/pump-connect or http://alturl.com/cv3tb My bosses sell these so I suppose I'm stuck with them even if there are a 100 better options. Cost would be a big issue. How expensive is it for your company to have to run a service call to repair something damaged by lightning or a power surge? Do you try to protect the equipment at all? ヽ(ヅ)ノ [8~{} Uncle Expensive Monster This is a unique situation for us. Solid state stuff is a new world for me. Distances are usually short enough that we can use mechanical relays and contactors. We really don't have much problem with them. We put 480 volt 3ø lightning arrestors for the incoming power to the irrigation system sometimes. The system will have some suppressors factory installed for the 110 volt circuitry. Other than that, no. |
OT. Solid state relay switching others
On Friday, August 4, 2017 at 7:20:18 PM UTC-5, Dean Hoffman wrote:
On 8/4/17 6:56 PM, Uncle Monster wrote: On Friday, August 4, 2017 at 6:27:00 PM UTC-5, Dean Hoffman wrote: On 8/4/17 7:27 AM, Uncle Monster wrote: Cut a bunch. There are solid state relays that have a wide voltage range to trigger them. The thing I'd be most worried about is what would happen to your control system when there is a nearby lightning strike. If you're running a very long control cable to low voltage triggered solid state relays, the induced voltage surge on the control cable could burn out your relays. If there is electrical power at your remote pumps, consider wireless control. ヽ(ヅ)ノ http://www.remotecontroltech.com/ [8~{} Uncle Uncontrollable Monster The last link in this hookup will have to be wireless due to lack of buried wires. http://www.valleyirrigation.com/valley-irrigation/us/irrigation-products/pumping-solutions/pump-connect or http://alturl.com/cv3tb My bosses sell these so I suppose I'm stuck with them even if there are a 100 better options. Cost would be a big issue. How expensive is it for your company to have to run a service call to repair something damaged by lightning or a power surge? Do you try to protect the equipment at all? ヽ(ヅ)ノ [8~{} Uncle Expensive Monster This is a unique situation for us. Solid state stuff is a new world for me. Distances are usually short enough that we can use mechanical relays and contactors. We really don't have much problem with them. We put 480 volt 3ø lightning arrestors for the incoming power to the irrigation system sometimes. The system will have some suppressors factory installed for the 110 volt circuitry. Other than that, no. I'd contact OMRON, tell them of your application and ask for a recommendation. The company has a lot of good information on their website about their SSR products. ヽ(ヅ)ノ http://www.ia.omron.com/support/guid...roduction.html http://www.ia.omron.com/view/contact/input.cgi [8~{} Uncle Relay Monster |
OT. Solid state relay switching others
On Fri, 4 Aug 2017 18:52:45 -0500, Dean Hoffman
wrote: On 8/3/17 9:15 PM, wrote: A bunch cut due to aioe quotation limits. I use SSRs a lot. You do need a little bit of a resistive load to make them turn off reliably but 15w of incandescent light seems to work OK. Typically they look like a 1000 ohm resistor so at 5v they draw about 5ma. (maybe more like 24ma at 24v) Voltage drop should not be a problem no matter what tho since the range is so wide. Just for gee whiz info 12ga wire at 1800 feet carrying a half an amp only drops 3.6v or so. Just be sure you have clean DC (no ripple). Typical transformer wall warts suck without adding a fat filter capacitor. but a switcher is OK. If you put a lamp (or just a resistor) for a load at the first SSR and the irrigation for the load at the slaves you should be fine. Could I bug you for specs of a resistor that would work? Would a 24vdc flashcube relay do the job? Thanks A mechanical relay would work fine. |
OT. Solid state relay switching others
On 8/4/17 10:53 PM, wrote:
On Fri, 4 Aug 2017 18:52:45 -0500, Dean Hoffman wrote: On 8/3/17 9:15 PM, wrote: A bunch cut due to aioe quotation limits. I use SSRs a lot. You do need a little bit of a resistive load to make them turn off reliably but 15w of incandescent light seems to work OK. Typically they look like a 1000 ohm resistor so at 5v they draw about 5ma. (maybe more like 24ma at 24v) Voltage drop should not be a problem no matter what tho since the range is so wide. Just for gee whiz info 12ga wire at 1800 feet carrying a half an amp only drops 3.6v or so. Just be sure you have clean DC (no ripple). Typical transformer wall warts suck without adding a fat filter capacitor. but a switcher is OK. If you put a lamp (or just a resistor) for a load at the first SSR and the irrigation for the load at the slaves you should be fine. Could I bug you for specs of a resistor that would work? Would a 24vdc flashcube relay do the job? Thanks A mechanical relay would work fine. Good deal. That relay might let me avoid the wireless pump shutdown. Cost plus terrain issues favor relays of some sort. Thanks again. |
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