440F-EAFPU01150 A-B programmable controller module
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If you connect a micro controller triac output to control an inductive load, we recommend that you use varistors to suppress noise. Choose a varistor that is appropriate for the application. The suppressors we recommend for triac outputs when switching 120V ac inductive loads are a Harris MOV, part number V175 LA10A, or an Allen-Bradley MOV, catalog number 599-K04 or 599-KA04. Consult the varistor manufacturer's data sheet when selecting a varistor for your application. For inductive dc load devices, a diode is suitable. A 1N4004 diode is acceptable for most applications. A surge suppressor can also be used. See the table on page 18 for recommended suppressors.
Minimizing Electrical Noise on Analog Controllers Inputs on analog controllers employ digital high-frequency filters that significantly reduce the effects of electrical noise on input signals. However, because of the variety of applications and environments where analog controllers are installed and operated, it is impossible to ensure that all environmental noise will be removed by the input filters. Several specific steps can be taken to help reduce the effects of environmental noise on analog signals: • install the MicroLogix 1000 system in a properly rated (i.e., NEMA) enclosure. Make sure that the MicroLogix 1000 system is properly grounded. • use Belden cable #8761 for wiring the analog channels, making sure that the drain wire and foil shield are properly earth grounded. • route the Belden cable separate from any ac wiring. Additional noise immunity can be obtained by routing the cables in grounded conduit.
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