GE IS220PTCCH1A Thermocouple Input Pack
Description：
IS220PTCCH1A is GE Mark VIe series Thermocouple Input Pack.

As the Thermocouple Input IS220PTCCH1A, short for PTCC provides the electrical interface between one or two I/O Ethernet networks (lONet) and a thermocouple input terminal board. The I/O pack contains a BPPx processor board and an acquisition board specifie to the thermocouple input function, Input to the PTCC is through dual RJ-45 Ethernet connectors and a three-pin power input, Output is through a DC-37 pin connector that mates directly with the associated terminal board connector, Visual diagnostics are provided throughindicator LEDs.

In a simplex configuration using the TBTCHlC terminal board, each PTCC is capable of handling up to 12 thermocouple inputs, for a total of 24 inputs (with two of them). ln simplex configuration using the TBTCHlB terminal board, each PTCC is capable of handling up to 12 thermocouple inputs (for a total of 24 inputs), provided the two PTCCs are installed at the JRA and JTB connectors. In TMR configuration with the TBTCH1B, three PTCCs are used with three cold junetions, but only 12 thermocouplesare available.

The PTCC internal input board (BPTC) accepts 12 signals at mV levels from the thermocouples wired to the terminal board. The analog input section consists of six differential multiplexers, a main multiplexer, and a 16-bit analog to digital converter that sends the digital data to the adjacent processor board. Each input has hardware and firmware filters, and the converter samples at up to 120 Hz.

Type E, J, K, S, and T thermocouples can be used with PTCCH1A, and they can be grounded or ungrounded. Type E, J, K, S, T, B, N and R thermocouples can be used with PTCCH2A, and they can be grounded or ungrounded. Thermocouples can be located up to 300 meters (984 feet) from the turbine I/O panel with a maximum two-way cable resistance of 450 Q.
Linearization for individual thermocouple types is performed in software by the I/O pack board. A thermocouple, which is determined to be out of the hardware limits, is removed from the scanned inputs to prevent adverse effects on other input channels. If two I/O packs are used, and both Cold Junction (CJ) devices are within the configurable limits, then the average of the two is used for CJ compensation.