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Introduction The power requirements for a High-Performance Process Manager (HPM) can necessitate the installation of one or more Power Systems in a cabinet complex. This requirement depends on the number and types of High-Performance Process Manager Modules (HPMMs), Input Output Processors (IOPs), and Field Termination Assemblies (FTAs) in the subsystem. In a large High-Performance Process Manager subsystem with redundant HPMMs and redundant IOPs, it may be desirable to install the HPMMs in separate cabinets with a Power System in each cabinet. With this configuration, a power failure in one Power System does not result in the failure of both the primary and secondary HPMMs and IOPs. Power loading and initial inrush Other considerations are the nonlinear loading and initial inrush that the Power System subassembly applies to the ac source when power is applied. Fuse clearing Clearing of the fuse (3 A) in the High-Performance I/O Link card in the HPMM may require additional current that a single Power Supply cannot adequately provide; therefore, a Power System with redundant Power Supply Modules is recommended. Power System load requirements Each Power System’s load requirements must be examined as a function of the options that are installed in the High-Performance Process Manager. These demands are discussed in the TPS System Site Planning manual. Power System considerations Each Power System can provide up to 20 A of 24 Vdc power. By calculating the total current requirement, you can determine how many Power Systems are required. If more than one Power System is required, it may be desirable to connect each High-Performance Process Manager Module (HPMM) to a separate Power System. It may also be desirable to connect the “A” IOP and “B” IOP of a redundant pair to separate Power Systems. Previously, Figure 2-25 illustrated a typical High-Performance Process Manager subsystem with redundant HPMMs in the same cabinet. Figure 2-26 illustrated a typical large subsystem in a cabinet complex with the redundant HPMMs in separate cabinets. Figure 2-25 illustrated a local cabinet complex with the redundant HPMMs in separate cabinets, and a remote cabinet with IOP card files.