531X305NTBANG2 - NTB/3TB Terminal Board

SPECIFICATIONS:

Part Number: 531X305NTBANG2
Manufacturer: General Electric
Series: Mark V
Number of Channels: 8
Product Type: NTB/3TB Terminal Board
Sample Rate: Up to 100 kS/s per channel
Power Requirements: +5 V dc, 6 A
Logic Levels: 3.3V and 5V compatible
Operating Temperature: 0°C to 70°C
Storage Temperature: -40°C to 85°C
Size: 30.48cm High x 21.33cm
Mounting: 4 mounting Holes
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEI-100020B

FUNCTIONAL DESCRIPTION:

531X305NTBANG2 is an NTB/3TB Terminal Board manufactured and designed by General Electric as part of the Mark V Series used in the GE Speedtronic Gas turbine Control Systems. The 531X305NTB (NTB/3TB) board is located within the drive (or exciter) cabinet. The board contains passive interface circuitry and the drive’s (or exciter’s) connection terminals for most external signal-level I/O. Figure 1 shows the NTB/3TB layout. The NTB/3TB connects to the drive control board via plugs 6PL and 8PL, to the power supply board via plugs 2PL and 4PL, and to external equipment via plug COMPL and terminal board 3TB. Refer to Tables 5 through 10 for I/O definitions. The NTB/3TB provides the following interfaces:

• Power supply
• Encoder
• RS-232C and RS422
• Relay Outputs
• Analog Tach and Reference coarse scaling
• Low-level analog I/O
• Digital control inputs

POWER SUPPLY:

Baluns (line chokes) provide two noise-filtered power supply outputs for driving digital encoders. Hardware jumpers allow distribution of the encoder loads among the +5 V dc and ±15 V dc supplies to balance loading. The NTB/3TB supplies the following power outputs for external use:

• Regulated +5 V dc and ±15 V dc, each with a current capacity of 300 mA
• Unregulated ±24 V dc, with a current capacity of 500 mA
• 120 V ac, with a current capacity of 0.5 A

ENCODER INTERFACE:

The NTB/3TB includes a differential A-quad-B encoder interface, including a marker channel, that can be connected to the drive. This circuit is optically isolated on the drive control board. The NTB/3TB includes jumpers to configure the interface for +5 V or ±15 V encoders.

RELAY OUTPUTS:

• Form C output from five relays controlled by the drive control board.
• One form A output and one side of the coil from a sixth relay controlled by the drive control board. This enables the coil to be controlled by the drive control board or an external ±24 V dc signal.
• External signals can also access the drive control board's coil driver output for applications that cannot tolerate the time delay associated with the relay pickup.
• Two form C contacts and both sides of the coil of a seventh relay for general-purpose use. A hardware jumper selects whether this coil is driven by ±24 V dc or 120 V ac.
• The board also supplies form C contacts from the MA contactor pilot relay on the Power Supply/Interface Board. These contacts are rated at 120 V ac, 2 A.

LOW-LEVEL ANALOG I/O:

The NTB/3TB includes four potentiometers (pots) for scaling (5 to 50 V) 10-bit, general-purpose, medium-resolution inputs to the drive control board (see Table 4 for pot settings). The NTB/3TB transfers two high-resolution analog inputs to the drive control board and receives four 8-bit, ±10 V analog outputs from it. These outputs drive functions such as other drives, analog meters, and diagnostics.

DIGITAL CONTROL INPUTS:

Various control inputs pass through the NTB/3TB to the drive control board. These include special-purpose digital inputs, such as RESET and CONTROL ON, and 12 gen- eral-purpose control inputs (up to ±24 V dc). Hardware jumpers are used to bias unconnected inputs to +24 or –24 V dc, depending upon whether positive or negative logic is used.

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FREQUENTLY ASKED QUESTIONS:

What is the NTB/3TB Terminal Board used for?

The NTB/3TB Terminal Board is a critical component of the GE Speedtronic Gas Turbine Control Systems. It serves as an interface board located within the drive or exciter cabinet, handling various connections and signal-level I/O. The board facilitates power supply, encoder interfaces, relay outputs, low-level analog I/O, and digital control inputs. It ensures seamless communication between the drive control board and external devices, ensuring smooth operation of the turbine control system.

Where is the NTB/3TB Terminal Board located in the system?

The NTB/3TB Terminal Board is located within the drive (or exciter) cabinet of the GE Speedtronic Gas Turbine Control System. It connects to several essential components such as the drive control board, power supply board, and external equipment, providing necessary interfaces and connections for power, signal, and control.

What types of connections does the NTB/3TB support?

The NTB/3TB Terminal Board is designed to interface with multiple components within the control system. It connects to the drive control board via plugs 6PL and 8PL, to the power supply board via plugs 2PL and 4PL, and to external equipment through plug COMPL and terminal board 3TB. These connections ensure that the board can distribute power and relay signals to and from external devices, enabling the control system to function efficiently.

What power supplies are available from the NTB/3TB?

The NTB/3TB provides several power supply outputs that are essential for the operation of external devices. It supplies regulated +5 V DC and ±15 V DC with a current capacity of 300 mA each. Additionally, the board provides unregulated ±24 V DC with a current capacity of 500 mA, as well as 120 V AC with a current capacity of 0.5 A. These power outputs are designed to support digital encoders and other system components, ensuring proper functionality.