Part 2

Plug-In Assembly Configuration 4833497-HV-A-2Figure 139. Option 115 - Contact Controlling Inductive LoadWhen lo and Vc are known, we can then determine load contact protection re-quirements, as summarized in the following chart where the types of loads are arbitrarilycategorized as type 1, 2 or 3. Note that ONLY type 3 loads in which Vc> 353V peak OR lo > 4 amps require external contact protection (in addition tothe snubber network).If the proposed load meets type 3 requirements, see Designing External Contact ProtectionNetworks for design samples. If the proposed load meets type 1 or 2 criteria,you don't have to add any networks and the actuator can be used as factory configured.To indicate the analysis method, some example solutions are shown for type1, 2 and 3 loads. After you determine the type of load, refer to the appropriate sectionfor details.I LOAD CONTACT PROTECTION CRITERIA ILOADTYPEPROTECTIONREQUIREDCRITERIA FOR LOADCOMMENTS1NONELoad is resistive,Vc< 353V peak AND lo< 400 mA.Can remove the snubbernetwork if required.2SNUBBERONLYLoad is inductive,Vc< 353V peak AND lo< 4 A.All three conditions mustbe met.3SNUBBER ANDEXTERNAL NET-WORKLoad is inductive, Vc> 353V peak OR lo> 4 A.If either Vc or lo exceedlimits, external networkis required.Note: lo = V(peak)/RL and Vc = lo= 0.1 CLF (assumed).where C = total circuit capacitanceArtisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com