GE IS200VTCCH1CBB VTCC VME‑Bus Thermocouple Input Processor Board

Description

Hardware & Electrical Specifications

• Model：IS200VTCCH1CBB
• Part Number：IS200VTCCH1CBB
• Module Type：VTCC VME‑Bus Thermocouple Input Processor Board
• Mounting：6U single‑slot VME rack backplane installation inside control cabinet
• Power supply：+5 VDC, ±12 VDC powered via VME backplane
• Thermocouple input：24 differential thermocouple input channels; support Type E, J, K, S, T thermocouple; also accept‑8~+45 mV direct millivolt signal input
• Cold‑junction compensation：On‑board high‑precision cold‑junction compensation for thermocouple reference junction
• ADC resolution：16‑bit high‑speed analog‑to‑digital conversion
• Scan rate：10 ms per‑channel sampling for turbine thermal protection loop
• Interface：VME backplane bus connector; multi‑pin front‑panel cable connectors for TBTC / DTTC terminal board interconnection
• PCB treatment：CBB‑revision conformal coated for dust‑moisture‑corrosion resistance
• On‑board protection：ESD protection, MOV surge suppression, thermocouple open‑circuit / short‑circuit burnout detection, signal over‑range monitoring, watchdog self‑monitor circuit
• Compatibility note：Cannot run standalone; must match Mark VI TBTC or DTTC terminal boards; full thermocouple‑loop simulation test mandatory after replacement.

Environmental Specifications

• Operating temperature：‑20 ℃ ~ +65 ℃
• Storage temperature：‑40 ℃ ~ +85 ℃
• Relative humidity：5%‑95% non‑condensing
• Installation location：Indoor turbine control cabinet
• EMC compliance：IEC 61000‑6‑2
• Certifications：CE, UL508

Mechanical Data

• Weight：approx 0.45 kg
• Dimension：280 mm × 160 mm × 25 mm
• Handling note：ESD‑sensitive PCB; micro‑volt weak‑signal measurement circuit, anti‑static wrist‑strap mandatory during handling
• Terminal tightening torque：0.6‑1.0 N·m

Main Functions

1. Receive low‑level millivolt thermocouple signals transmitted from TBTC field terminal board.
2. Execute cold‑junction compensation, signal filtering and high‑precision A‑D conversion, convert millivolt signal into engineering temperature value.
3. Transmit digital temperature data to main controller via VME bus, provide temperature source for turbine exhaust over‑temperature protection and thermal trending monitoring.
4. Channel‑level fault diagnosis: detect thermocouple open‑circuit, short‑circuit, burnout and signal over‑range; mark faulty channel without affecting other normal measurement channels.
5. On‑board self‑diagnosis: detect VME‑bus communication abnormality, watchdog timeout, internal reference voltage drift; upload fault alarm to turbine main controller.
6. LED status indication:
   • Green LED：Board power supply normal
   • Yellow LED：VME‑bus communication active
   • Red LED：Thermocouple‑channel fault / module failure alarm

Installation & Wiring Requirements

1. Cut off rack power supply before replacement. Hot‑swap is forbidden. Strict anti‑static protection when handling PCB board.
2. Insert board into designated VME slot, secure panel locking screws; ensure all multi‑pin cable connectors fully locked without loose contact.
3. Field thermocouple wiring strictly follow GE Speedtronic Mark VI wiring manual; thermocouple extension cable must match sensor type, adopt shielded twisted‑pair, strictly separated from high‑power cables; connect shielding to dedicated ground terminal.
4. Complete protective grounding according to GE Speedtronic system specification.
5. After replacement: verify VME rack power status, check each‑channel temperature reading, simulate thermocouple open‑circuit / short‑circuit fault condition before commissioning.
6. Replacement note: For TMR triple‑redundant system application, hardware consistency of related VTCC boards shall be verified; full thermocouple‑loop simulation test mandatory before unit put‑into‑service.