I'd like more informations about 4 wires device connection to a AI895.
Good Morning. I'd like more informations about 4 wires device connection to a AI895 (Analogic Input Device - Intrisic Safety Interface), mainly about the external Zener Diode connection requirement (between device and negative channel from my AI895).
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Check connection diagram and details below,
1 + : transmitter power output
10 - : transmitter signal input
The external zener diode should be mounted in a proper socket. For example, the DIN rail terminal block which have the capability to mount internal components (produced by Phoenix, Cabur, etc.).
The external zener diode is a 24 V +/- 5% 5 W type 1N5359 (by Motorola).
The external zener diode does not change the intrinsically safe parameters of the loop (it is a passive component with no storage energy).
check more details in manual 3BSE 020 927R201 Rev A.