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SPECIFICATIONS:
Part Number: IS220PAICH1A, REV F
Manufacturer: General Electric
Series: Mark VIe
Product Type: Analog I/O Terminal Board
Operating System: QNX
Power Requirements: +5 V dc, 6 A
Number of input channels: 12
Number of outputs: 125 V dc
Trip Solenoid Rating: 125 V dc
Power supply voltage: 28 V dc
Voltage Range: 18 - 32 VDC
Mounting: DIN-rail mounting
Technology: Surface mount
Operating temperature: 40 to 70°C
Size: 33.0 cm high x 17.8 cm
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEH-6721D
FUNCTIONAL DESCRIPTION:
IS220PAICH1A, REV F is an Analog I/O Terminal Board manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Gas Turbine Control Systems. The PAIC I/O pack is the electrical interface between one or two I/O Ethernet networks and an analog input terminal board. It features a shared processor board for all Mark VIe distributed I/O packs and a dedicated acquisition board for analog input functions. Supporting up to 10 analog inputs, the first eight can be set for 5V or 10V inputs or 0-20 mA current loops, while the last two allow either 1 mA or 0-20 mA current inputs. Load terminal resistors for current loops are on the terminal board, with voltage measured across them by the PAIC.
The PAICH1 version includes two 0-20 mA current loop outputs, whereas the PAICH2 version adds hardware for a 0-200 mA current output on the first channel. Input connections use dual RJ45 Ethernet ports and a three-pin power input, while output is managed through a DC-37 pin connector to the terminal board. Diagnostic features include indicator LEDs and an infrared port for local serial communication.
COMPATIBILITY:
The PAICH1A is compatible with the TBAIH1C analog input terminal board and the STAI board but does not support the DIN rail-mounted DTAI board. Control mode defines the number of I/O packs in a signal path:
Although the PAIC can be mounted on TBAIH1A or TBAIH1B terminal boards, it will not achieve full analog signal accuracy due to circuit differences. It is designed for use with the H1C version of TBAI and will indicate compatibility issues if connected to earlier revisions. However, powering a PAIC on an older board will not cause physical damage.
OPERATION:
The processor application code includes all the necessary logic for the pack to function with one or two Ethernet inputs. When using two Ethernet inputs, both network paths remain active continuously, and a failure of one network does not affect the I/O pack operation. The failure is indicated via the active network connection. This setup offers greater fault tolerance compared to traditional hot-backup systems, where the secondary port is only used after detecting a primary port failure. The Ethernet ports on the processor automatically negotiate speeds between 10 MB/s and 100 MB/s and can switch between half-duplex and full-duplex operation.
COMPRESSOR STALL DETECTION:
Gas turbine compressor stall detection is included with the PAIC firmware and is executed at a rate of 200 Hz. There is a choice of two stall algorithms and both use the first four analog inputs, scanned at 200 Hz. One algorithm is for small LM gas turbines and uses two pressure transducers, refer to the figure, Small (LM) Gas Turbine Compressor Stall Detection Algorithm. The other algorithm is for heavy-duty gas turbines and uses three pressure transducers, refer to the figure, Heavy Duty Gas Turbine Compressor Stall Detection Algorithm. Real-time inputs are separated from the configured parameters for clarity.
The parameter CompStalType selects the type of algorithm required, either two transducers or three. PS3 is the compressor discharge pressure, and a drop in this pressure (PS3 drop) is an indication of a possible compressor stall. In addition to the drop in pressure, the algorithm calculates the rate of change of discharge pressure, dPS3dt, and compares these values with configured stall parameters (KPS3 constants). The compressor stall trip is initiated by PAIC, and the signal is sent to the controller where it is used to initiate a shutdown. The shutdown signal can be used to set all the fuel shut-off valves (FSOV) through the VCRC and TRLY or DRLY board.
WOC has the largest stock of OEM replacement parts for GE Distributed Turbine Control Systems. We can also repair your faulty boards and supply unused and rebuilt boards backed up with a warranty. Our team of experts is available round the clock to support your OEM needs. Our team of experts at WOC is happy to assist you with any of your automation requirements. For pricing and availability on parts and repairs, kindly contact our team by phone or email.
What is the maximum number of analog inputs supported by the PAIC I/O pack?
The PAIC I/O pack supports a maximum of 10 analog inputs. The first eight inputs can be configured for 5V or 10V voltage inputs, or 0-20 mA current loop inputs. The last two inputs are adjustable for 1 mA or 0-20 mA current loop inputs.
How does the PAIC I/O pack handle different input configurations?
The first eight inputs are configurable for voltage (5V or 10V) or current loop (0-20 mA) inputs, while the last two can be set for either 1 mA or 0-20 mA current inputs. Load terminal resistors for current loop inputs are placed on the terminal board, and the voltage is measured across these resistors by the PAIC.
What are the communication interfaces supported by the PAIC I/O pack?
The PAIC I/O pack uses dual RJ45 Ethernet connectors for network communication and a three-pin power input connector for power application. It outputs via a DC-37 pin connector to the terminal board.
