GE IS200TVBAH2ACC TVBA‑2 Vibration Monitoring Terminal Board

Description

Hardware & Electrical Specifications

• Model：IS200TVBAH2ACC
• Part Number：IS200TVBAH2ACC
• Module Type：TVBA‑2 Vibration Monitoring Terminal Board
• Mounting：Cabinet panel mounting inside turbine control cabinet
• Logic power supply：24‑28 VDC supplied by PVBA / VVIB vibration‑monitor processor pack
• Vibration input channels：8 configurable analog input channels
• Supported sensor types：proximity probe (shaft displacement), accelerometer, velocity seismic sensor, 4‑20 mA loop‑powered vibration transmitter
• Input signal：±5 VDC for proximity probes; 4‑20 mA for transmitters, on‑board 250Ω precision sampling resistor
• Sensor excitation：‑24 VDC isolated excitation power for proximity probe pre‑amplifiers
• Signal bandwidth：DC‑1 kHz (‑3dB) anti‑aliasing hardware filter for vibration signal path
• Conversion resolution：16‑bit ADC analog‑to‑digital conversion
• Isolation：2500 Vrms galvanic isolation between field side and control rack side, suppress plant ground‑loop interference
• Interface：Removable barrier‑type screw terminal blocks for field vibration‑sensor wiring; multiple multi‑pin ribbon‑cable connectors for PVBA / VVIB processor interconnection; BNC buffered test output ports for external vibration analyzer connection
• PCB treatment：ACC‑revision conformal coated for dust‑moisture‑corrosion resistance
• On‑board protection：ESD protection, MOV surge suppression, per‑channel over‑voltage / over‑current limiting, sensor open‑/short‑circuit fault detection circuit
• Compatibility note：Cannot run standalone; must match Mark VI / Mark VIe PVBA or VVIB vibration‑monitor processor pack; full vibration‑loop simulation test mandatory after replacement.

Environmental Specifications

• Operating temperature：‑30 ℃ ~ +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

Mechanical Data

• Weight：approx 0.60 kg
• Dimension：263 mm × 160 mm × 28 mm
• Handling note：ESD‑sensitive PCB; high‑precision weak‑signal vibration‑conditioning circuit, anti‑static wrist‑strap mandatory during handling
• Recommended wire cross‑section：0.75‑2.5 mm² shielded twisted‑pair copper cable for proximity probe and vibration‑sensor wiring
• Terminal tightening torque：0.6‑1.0 N·m

Main Functions

1. Removable screw‑terminal field termination for shaft proximity probes, bearing accelerometers, seismic velocity sensors and vibration 4‑20 mA transmitters.
2. Provide isolated‑24 VDC excitation power for proximity probe pre‑amplifiers.
3. Hardware filtering and conditioning for vibration analog signals, convert field weak vibration signals into standard analog values and transmit to PVBA / VVIB processor pack.
4. BNC buffered vibration test output ports, supports external vibration instrument access for offline signal verification.
5. Galvanic isolation between control rack and field‑side sensors, suppress turbine‑hall high‑EMI transient interference.
6. On‑board channel self‑diagnosis: detect sensor open‑circuit / short‑circuit, excitation power abnormal, ribbon‑cable link failure; upload fault alarm to turbine main controller.
7. LED status indication:
   • Green LED：Board auxiliary power normal
   • Yellow LED：Ribbon‑cable link communication active
   • Red LED：Vibration‑channel fault / excitation‑power fault / link‑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. Secure panel mounting firmly; ensure all multi‑pin ribbon‑cable connectors fully locked without loose contact.
3. Field vibration‑sensor wiring strictly follow GE Speedtronic Mark VI / Mark VIe wiring manual; vibration analog cables adopt high‑quality 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 ribbon‑cable link status, check each‑channel sensor excitation voltage, verify vibration measurement reading, simulate sensor fault condition before commissioning.
6. Replacement note: For TMR triple‑redundant system application, hardware consistency of related processor packs shall be verified; full vibration‑monitor‑loop simulation test mandatory before unit put‑into‑service.