GE IS200TBTCH1B Thermocouple Input Terminal Board

GE IS200TBTCH1B Thermocouple Input Terminal Board

Functional Description

The Thermocouple Input (TBTC) terminal board accepts 24-type E, J, K, S, or T thermocouple inputs. It

accepts additional B, N and R types of thermocouple inputs only when used with PTCCH2 in Mark VIe.

Installation 

Connect the thermocouple wires directly to the two I/O terminal blocks. These removable blocks are

mounted on the terminal board and held down with two screws. Each block has 24 terminals accepting up to

#12 AWG wires. A shield terminal strip attached to chassis ground is located on the left side of each

terminal block. 

In Mark VI systems, cable the TBTC J-type connectors to the I/O processors in the VME rack. 

In Mark VIe systems, plug the I/O packs directly into the TBTC J-type connectors. The number of cables or

I/O packs depends on the level of redundancy required

Operation

The 24 thermocouple inputs can be grounded or ungrounded. They can be located up to 300 m (984 ft) from

the turbine control panel with a maximum two-way cable resistance of 450 Ω. TBTC features high-frequency

noise suppression and two CJ reference devices, as shown in following figure. The I/O processor performs

the analog-to-digital conversion and the linearization for individual thermocouple types. 

For TMR systems using TBTCH1B, the thermocouple signals fan out to three J-connectors. The Mark VI

system accommodates 24 inputs and the Mark VIe system accommodates 12 inputs. 

The TBTC terminal board supports all thermocouple spans documented for the associated thermocouple I/O

processor.

Technical Specifications