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    How does the Test Button on the RH99 work?

    When the test push button is activated the switch SW1 is moved on Test position. The measurement of the network is temporarily stopped during 15ms and a sinusoidal signal of 500Hz to simulate a trip is sent to create a current of 100µA inside the resistor R. The signal seen by the toroid sensor is really negligible about the test signal injection.
    During the test signal injection the settings are: Idn = 30mA and tfault = 0.
    At the end of the 15ms delay
    -> if the product trips (TEST OK) the fault LED and the Fault order relay are activated (in case of no trip test only the fault LED is activated). We have to push on the push button Reset to remove the failure create by the test (in case of automatic reset product no action need to remove the failure).
    -> if the product doesn’t trip, no LED, no relay order the TEST is NOK and it means the product doesn’t work.
    After the 15ms of test signal injection the switch SW1 comes back to the measure position and re-starts the monitor of the network with the customer settings (in the front face).
    So if a trip occurs during the test, it will be see directly after the 15ms of test signal injection and it will be impossible to remove the failure state by a push on Reset push button.
     
    The toroids used on the Vigirex range have only one winding inside.   
     
    There is no Calibration procedure for this product. The product is designed to provide the accuracy specified on the catalogue for the product life time.


     

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