DS2020PDMAG5 - Power Distribution Module

SPECIFICATIONS:

Part Number: DS2020PDMAG5
Manufacturer: General Electric
Series: Mark V
Input Power: 125 V DC
Operating Temperature: 0°C to 60°C
Number of Input Sources: 125 Volt
Communication Protocols: Compatible with system control networks
Input Protection: Overcurrent, short-circuit protection
Dimensions: Typically 19" (W) x 6" (H) x 12" (D)
Outputs: 2 TMR I/O Racks
Product Type: Power Supply
Weight: Approximately 2 to 3 kg
Availability: In Stock
Country of Origin: USA

FUNCTIONAL DESCRIPTION:

DS2020PDMAG5 is a Power Distribution Module manufactured by General Electric as part of the Mark V Series used in gas turbine control systems. The 125 V DC is primarily used to power the control racks, which house the system’s critical electronics, such as CPUs and I/O modules, ensuring steady and reliable operation of the control circuitry. Meanwhile, the 115 V AC or 230 V AC is used for driving mechanical components like actuators, motors, and other devices that regulate physical functions in the turbine, such as valves and pumps. For systems that incorporate remote I/O cabinets, which allow for extended monitoring and control capabilities, a second version of the PDM is utilized in the control cabinet to distribute power to both the central control unit and the remote cabinets, ensuring that all parts of the system are adequately powered and synchronized. This setup ensures efficient operation, redundancy, and reliability across the entire turbine control system.

OPERATIONS:

Power filters are used to enter the PDM with the customer's 125 V de and 115/230 V ac power. One or two ac/de converters that produce 125 V de are wired to receive the ac power. When this de voltage is cabled back into the PDM and diode linked to the main depower, a backup power source is created. The VME racks and terminal boards receive this power distribution. The ac/de converters are capable of handling either 230 V or 115 Vac. For 230 V ac operation, the transformer cable must be inserted into either JTX2 or JTXI. The PDM is used to gather diagnostic data, which is then linked to a terminal board installed on a DIN rail. Then, a cable travels through 1301, ending at the VCMI in rack-R. Fused and cabled out to the relay terminal boards are the AC feeds, J17–20.

The interface (I/O) cabinets, protection modules, TRPG, TREG, and TRLY are all connected by cables with fuses on them. The PDM is delivered through a control power filter (CPF), which reduces EMI noise, to ensure a noise-free supply to the boards. According to the next figure, the CPF rack can store two or three Corcom 30 A filter modules. Before being fused and cabled to the TBCI boards, power to the contact inputs first goes via TB2, then through resistors R3 and R4, and then through TB2. Operation of contact inputs requires 125 V de-excitation.

CONFIGURATION:

• Switches: There are several jumpers and switches on the PDM for the I/O cabinets, as shown below. See the circuit diagrams for information on placement and operation.

• Jumpers: There are jumpers on TB2 and TBI. On TB3, some resistors lower the 125 V dc to 1.82 V de so that the bus may be monitored.

• Ground reference Jumper: For ground reference isolation on systems with an external ground reference, jumper BIS is provided. The center of the ground reference bridge is connected to the ground by BJS, and it has two resistances—one on each side—across the 125 V depower.

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FREQUENTLY ASKED QUESTIONS:

What type of power input does the Power Distribution Module support?

The module accepts 125 V DC as its main input power. Additionally, it can handle 115 V AC or 230 V AC for mechanical components in the turbine system.

Does the Power Distribution Module provide backup power?

Yes, the module is designed to ensure redundancy. It has a backup power source by routing the DC voltage back into the PDM and using diodes linked to the main depower to maintain operation if the primary power source fails.

Can the Power Distribution Module be used in remote I/O cabinet systems?

Yes, the module is compatible with systems using remote I/O cabinets. For such configurations, a second version of the PDM is used in the control cabinet to distribute power to both the main control unit and the remote cabinets.