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    How to Troubleshoot the DS7420i Bell & AUX Outputs

     

    Issue

    What is the normal and off-normal voltages on the DS7420I for the Bell and Auxillary outputs?

    Solution

    1A) The normal Bell output voltage on the DS7420I (with EOL intact) should be around negative(-) 5VDC.

    1B) The off-normal Bell output voltage (with EOL removed) should be around negative (-) 12VDC (when EOL is not being detected by the DS7420I).

    1C) The voltage on the Bell output when a fire alarm is going off should be around positive (+) 12VDC.

    2A) The normal Auxillary output voltage on the DS7420I (with EOL intact and supervision jumper not cut) should be around negative (-) 5VDC.

    2B) The off-normal Auxillary output voltage (with EOL removed) should be around negative (-) 12VDC.

    2C) The voltage on the Auxiilary output when a Fire alarm is going off should be around positive (+) 12VDC.

    2D) To unsupervise the Auxillary output cut the Auxillary output jumper located near the Aux. output terminals on the DS7420I.

    2E) When the supervision jumper is cut the normal and off-normal Auxillary output voltage should be 0VDC (with or without EOL).

    Part numbers DS7400X, DS7400, DS7400Xi, DS7400XIVER2, DS7400XIVER3+, DS7400XIVER4+, DS7420i

    Version history
    Revision #:
    1 of 1
    Last update:
    ‎06-17-2018 11:27 PM
    Updated by:
     
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