Relays Load Alternator - duplex relay How it works
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Date: 2023-11-17
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Comments and reviews: 9
vinny142
Rememeber that equal runtime and equal wear means both devices will reach their breakingpoint at the same time.
I witnessed a horible example of this in a computerserver where 12 harddisks where setup in an array of 2x6 disks. This meant that the data was spread over 6 disks and then copied onto the other 6 disks. Theoretically this means you can have 1 disk fail on each group of six and still have your data safe. If two disks fail on the same set there is a second set that still has the data. Unfortunately all 12 disks where purchased at the same time and they came from the same production run, so they where exactly the same age. So what? Well the unthinkable happened; within one week three disks failed, two on one set of 6 and one in the other. If a fourth one had failed before the new shipment of disks delivered, the company would have suffered serious data loss.
Since then I make it a point to wait a few weeks between ordering multiple units of the same device, or I order them from different suppliers, just so there is no chance of getting units from the same age or possibly the same faulty production run.
reply
Rememeber that equal runtime and equal wear means both devices will reach their breakingpoint at the same time.
I witnessed a horible example of this in a computerserver where 12 harddisks where setup in an array of 2x6 disks. This meant that the data was spread over 6 disks and then copied onto the other 6 disks. Theoretically this means you can have 1 disk fail on each group of six and still have your data safe. If two disks fail on the same set there is a second set that still has the data. Unfortunately all 12 disks where purchased at the same time and they came from the same production run, so they where exactly the same age. So what? Well the unthinkable happened; within one week three disks failed, two on one set of 6 and one in the other. If a fourth one had failed before the new shipment of disks delivered, the company would have suffered serious data loss.
Since then I make it a point to wait a few weeks between ordering multiple units of the same device, or I order them from different suppliers, just so there is no chance of getting units from the same age or possibly the same faulty production run.
reply
Ryarios
Ive always had problems with equal runtime, alternating systems. I would rather have the duty system run several times for each run of the standby. That way both systems dont end up wearing out at the same time. You can have the standby run often enough to exercise it properly. Its harder to do with simple relay logic.
Now, there are very valid reasons why you dont want the same piece of equipment to start all the time. Thats fine you can alternate them at that point.
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Ive always had problems with equal runtime, alternating systems. I would rather have the duty system run several times for each run of the standby. That way both systems dont end up wearing out at the same time. You can have the standby run often enough to exercise it properly. Its harder to do with simple relay logic.
Now, there are very valid reasons why you dont want the same piece of equipment to start all the time. Thats fine you can alternate them at that point.
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Michael
PLCs have gotten so cheap these days that by the time I got to the lead-lag case I would have designed in a CLICK. The benefit of the PLC is the ability to do more advanced logic like actual run hours balancing as opposed to just alternating and detect various faults (like if a compressor is not generating pressure even though its on. Plus, the PLC can get all this info from a single pressure transducer as opposed to multiple pressure switches.
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PLCs have gotten so cheap these days that by the time I got to the lead-lag case I would have designed in a CLICK. The benefit of the PLC is the ability to do more advanced logic like actual run hours balancing as opposed to just alternating and detect various faults (like if a compressor is not generating pressure even though its on. Plus, the PLC can get all this info from a single pressure transducer as opposed to multiple pressure switches.
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Andrew
Standby and Duty Systems, only work, if the People who control the Money, understand why they are required. I've had it, where I had a Duty Pump fail and the Standby took over, we went to get the Failed pump repaired, only to be told, Why you've got a Pump Running, you dont need the other one. This is all well, until that one breaks as well, but all we got is Risk versus Cost
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Standby and Duty Systems, only work, if the People who control the Money, understand why they are required. I've had it, where I had a Duty Pump fail and the Standby took over, we went to get the Failed pump repaired, only to be told, Why you've got a Pump Running, you dont need the other one. This is all well, until that one breaks as well, but all we got is Risk versus Cost
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mikeall
Newer pumps and motors are getting so well design it is starting to negate the need for this. In my industry we are getting away from frequent equipment swaps and instead leaving 1 machine in service for up to 2 years at a time. We simply bump test the standby or test the auto start logic and secure it. This prevents false bruneling for horizontal pumps.
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Newer pumps and motors are getting so well design it is starting to negate the need for this. In my industry we are getting away from frequent equipment swaps and instead leaving 1 machine in service for up to 2 years at a time. We simply bump test the standby or test the auto start logic and secure it. This prevents false bruneling for horizontal pumps.
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clive
on more than one occasion i've seen jobs with a twin pump set installed without the necessary controls fitted. instead of using an alternating relay the installers just permanently disconnect power to one of the two pumps, the other pump runs continuously. very naughty but they do get away with it.
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on more than one occasion i've seen jobs with a twin pump set installed without the necessary controls fitted. instead of using an alternating relay the installers just permanently disconnect power to one of the two pumps, the other pump runs continuously. very naughty but they do get away with it.
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Jennie
Most of the new and updated equipment in heavy industry has been connecting these systems to the automation for decades. The automation system allows for more flexibility in the overall system utilization.
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Most of the new and updated equipment in heavy industry has been connecting these systems to the automation for decades. The automation system allows for more flexibility in the overall system utilization.
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Darko
like first example you can start two fans with two contactors and two relays you dont need load alternator relays
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like first example you can start two fans with two contactors and two relays you dont need load alternator relays
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Potrimpo
I'm still trying to wrap my head around it, but I've learned more on these videos than I have in school.
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I'm still trying to wrap my head around it, but I've learned more on these videos than I have in school.
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