DGC Brushless Excitation - Emerson Process Management

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DGC Brushless Excitation System Description The IOICU receives and conditions digital input signals from the field in three ranges: 125 VDC, 15 VDC and 5 VDC and converts them to the 5 VDC logic states. Digital inputs are optically isolated. The IOICU converts the logic states to dry relay contacts and provides the capability to “tristate” each of the digital outputs as part of the redundancy features of the DGC. 3.3.d VME Power Supply Each DGC channel is equipped with its own rack mounted, quad output, power supply module. Each Power Supply is fed by two independent power sources; Station 125 VDC system and an independent 120 VAC source. Each Power Supply provides dedicated power to its respective channel of the DGC at +5 VDC, +12 VDC and -12 VDC. Each power supply also provides auctioneered +48 VDC to the IOICU Backplane for distribution to the Field Interface Panel and the cooling fans. 3.3.e Network Hub Module The Network Hub Module provides a hub for Ethernet communication with the DGC channels. The two single board computers also use the network connection for inter-processor communications. The network connection is also used by the DGC configuration software and optional SCADA software. 3.4 Field Interface Panel The Field Interface Panel (FIP) is a large printed circuit card with a purpose to provide simple and reliable connections between the DGC computer and the field. The FIP connects to the IOICU backplane using prefabricated ribbon cables. FIP2 for WTA Retrofit Applications / FIP3 for Stand Alone Applications The field terminations on the FIP are designed to accommodate the physical connections for two distinctly different DGC applications. For the WTA Retrofit application, the FIP connects to the field using four large AMP connectors, which are compatible with the existing WTA Regulator cable harnesses. For all other applications, the FIP connects to the field using “euro” style terminal blocks mounted on the periphery of the board. The FIP is largely a passive device. The only active components mounted on the FIP are interposing relays and LEDs that are assigned to some of the digital output circuits to accommodate higher contact rating requirements. © Emerson Process Management Power & Water Solutions. - 8 - PWS_005075 [3]
DGC Brushless Excitation System Description © Emerson Process Management Power & Water Solutions. - 9 - PWS_005075 [3]
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DGC Brushless Excitation - Emerson Process Management

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