Product introduction：

The S200JPDFG1A is a GE component manufactured as part of the Mark VI system. The system is part of the long-running Speedtronic family created and developed by GE for gas/steam turbine management. Various systems bearing the Speedtronic name have been used for heavy-duty turbine management for over thirty years. Mark VI was one of the last systems to be released and included Ethernet communication and a Windows PC-based operator interface.

The IS200JPDFG1A is part of the IS2020JPDF power module, which consists of a circuit board, sheet metal structure with DC circuit breakers, input filters, current limiting resistors and series diodes. The IS200JPDFG1A provides connectivity for two DACA modules if required. The IS200JPDFG1A board is used to distribute DC power to large capacity DC power. The IS200JPDFG1A uses ribbon cable connections for system feedback, such as DC bus voltage and ground fault detection through the PPDA board.

The IS200JPDFG1A has six toggle switches placed in a line. Three of them included a warning label that read, “Beware, after power failure, wait 30 seconds, then power back on.” The IS200JPDFG1A has 18 fuses with independent power ratings. It has 14 plug connectors, including 2-bit plugs (10), 12-bit plugs (2), 9-bit plugs and 5-bit plugs.

The IS200JPDFG1A includes metal film resistors, box capacitors, ceramic capacitors, TP test points, and transistors. Components are labeled with reference labels. For more information about the board and its components, see GE publication GEI-100613.

Install

The module is vertically installed on the metal base of the PDM cabinet. JPDF sheet metal must be connected to the protective ground (PE) of the system.

Terminal DCHI and DCLO receive input battery power. When using one or two DACA modules, AC power will be applied to the JAF1, usually from the JPDB module. The JZ2 and JZ3 connectors connect the DACA module to the JPDF. The output circuit of the system has been connected according to the document.

A distribution system with a PPDA power diagnostic I/O package requires a 50-pin ribbon cable from the JPDF connector P1 to the P2 connector on the board containing the PPDA. With P2 connectors, this connection can be extended to other core PDM boards.

IS200JPDFG1A

Ground fault detection

The module supports the use of high resistance DC busbars centered on ground potential. This configuration detects ground faults when the positive or negative bus voltage reaches the ground potential. It includes separate voltage feedback detection of positive and negative power relative to ground to support this arrangement.

When the feedback is connected to the PPDA I/O packet, the system detects a ground fault. The resistance used to center the DC bus to the ground determines the sensitivity of the ground detection and the ground fault current that can flow.

It has a centering resistance selected by jumper JP1. If a centering resistor is provided elsewhere, the JPDF jumper should remain open. The JPDF is then designed to introduce a minimum centering resistance into the system. If JPDF provides centering, JP1 should be turned off. If two JPDF modules are used, only one JPDF module should have a closed JP1 jumper.

Controls

The terminal DCHI and DCLO are powered by DC batteries. It then passes through a 30 amp DC circuit breaker to the filter assembly located below the IS200JPDF circuit board. The filtered output is then routed to the JPDF board via a series diode.

JAF1 connector receives AC power. 115/230 V AC is routed to the two connectors JZ2 and JZ3 and then output to the two DACA modules. The DACA module converts alternating current to direct current (125 V dc).

The DC power supply returns to the JPDF via the same JZ2 and JZ3 connectors and is used in combination with the battery power supply if present.

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