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sku 200327 current limiting resistor simply burned up 2020-09-15T22:22:25+00:00

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  • Bryan
    September 15, 2020 at 10:22 pm
    Post count: 0
    #46516 Reply |

    Hi,

     

    I bought 200327 to convert 4-20mA to 0-10V for my led controller. My power is 24VDC.

    I am using a PLC to control the current. The PLC is a sinking module and must be supplied with current in the range of 18-30VDC, meaning that the device acts as a power source (In this case a current source) and sends it to the PLC. The PLC actually throttles the current with an internal transistor.

     

    My current wiring setup goes:

    24V+ -> 0.5a fuse -> (current source+)

    (Current source -) -> PLC current input DA2I, which then through the PLC hardware current is throttled and sent to ACOM (0V)

    So my question is why did the resistor just burn up? I do not have continuity between my (Current source -) and 0V. So there should have been no current. Is the current sampling resistor not rated for 24V, or is this unit not meant to be used as a sourcing module?

    Drok
    Keymaster
    September 16, 2020 at 8:03 am
    Post count: 2971
    #46552 Reply |

    Hello Bryan，

    Do you mean 24 v power supply is connected to current input port? If it is that case, what is connected to VCC and GND?

    We are sorry it is hard to confirm connection. Would you like to show that by images or diagram?

    You can share us link or send pictures to service@droking.

    Best regards,

    DROK

     

     

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