Productive dc voltage sensing relay for High-Risk Applications
Reliable dc voltage sensing relay Designs for Commercial and Industrial Applications
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Jimmy Maxwell asked where can I get a basic automatic start circuit for a generator from ?
I have a large generator, its converted from 3 phase to single phase, but I need an automatic start circuit for a single phase supply, when the mains fails it starts and automatically changes over to generator supply. The old 3 phase circuit is no good, as it senses phase imbalance and volts loss, which is no good on single phase - I tried linking all inputs, but it still does not start on mains failure. Has anyone a basic relay circuit anywhere ?? Thanks ......
And got the following answer:
So it is not the whole control system you want to replace, just the power failure/recovery detection. I guess it is possible to replace this with a mains failure relay as a simplest approach. Ideally it will detect over-voltage, under-voltage, and no voltage, but with appropriate delays to reduce nuisance starts. The link below looks like something basic. Its output is a changeover contact (form C). A simple circuit could be a contactor with an appropriate 120VAC or 240VAC coil, or a small DC power supply (12 or 24V) that operates a relay with the same DC coil voltage, as long as power is present. It probably needs mains rated contacts. This relay contact will connect to the circuit wherever the old 3 phase mains failure detection connected. The advantage of this small power supply unit is that you can later add battery back-up for a fail buzzer, time delays, threshold settings etc if you wish. There may need to be a similar modification to the part of the auto start system that detects the generator output is valid.
The dc voltage sensing relay perform extremely well with unique applications that happen to be particular to power distribution and protection. The relays include wide adjustment ranges with a scale that may be easy to read either in 3 or four digits in accordance with the model. These dc voltage sensing relay aid in escalating the flexibility with the applications, lower the overall power and maintenance fees. There are actually relays that are utilized for common purposes which are available in reliable styles with speedy replacement choices. And you can find models that are employed for industrial applications and heavier duty applications that operate on big loads. These merchandise are made to meet the lifetime industrial handle needs in the applications.
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