Hi guys,
I'm designing a control panel system and one of the require from customer is to have parallel (2 units) power supply (24V DC) for the control panel & PLC as well.
There is one incoming 230V AC to the 2 units of power supply (230V AC to 24V DC). Each 24V DC power supply output will energize a relay & a pilot lamp (24V DC). in the event if any of the 24V DC power supply is faulted the relay wiil be de-energize and send an OFF signal to the PLC DI and the pilot lamp for that particular power supply will also be OFF.
My concern is do we need to put a diode after the power supply output, after the relay & pilot lamp so there is no current flow backward? Or izzit possible/advisible to do so?
I'm not sure what problem will I be facing, please advise me....thanks a lot.
I'm designing a control panel system and one of the require from customer is to have parallel (2 units) power supply (24V DC) for the control panel & PLC as well.
There is one incoming 230V AC to the 2 units of power supply (230V AC to 24V DC). Each 24V DC power supply output will energize a relay & a pilot lamp (24V DC). in the event if any of the 24V DC power supply is faulted the relay wiil be de-energize and send an OFF signal to the PLC DI and the pilot lamp for that particular power supply will also be OFF.
My concern is do we need to put a diode after the power supply output, after the relay & pilot lamp so there is no current flow backward? Or izzit possible/advisible to do so?
I'm not sure what problem will I be facing, please advise me....thanks a lot.