Description
1. Product Overview
Part Number: IS200RAPAG1BBA
Manufacturer: GE General Electric. It is the core rack power card for Speedtronic Mark VI Turbine Control System. Suffix BBA refers to fixed factory hardware revision. As the central power supply unit of Mark VI main control rack for gas and steam turbine generator sets, it provides multi-channel isolated DC regulated power for CPU, I/O, communication and signal conditioning boards inside the whole rack.
Compatible System: Designed exclusively for standard 19-inch VME parallel backplane racks of Mark VI Innovation series, fully compatible with simplex, dual redundant and TMR triple redundant control architecture. It can also be applied to shared rack power topology of EX2100 generator excitation system. The edge connector directly plugs into the rack mother board to complete power distribution without extra external wiring.
2. Six Core Hardware Functional Units
2.1 Main High-Frequency Switching Power Conversion Unit
It accepts 48V 25kHz square-wave input from the rack pre-drive power supply, and realizes voltage step-up/step-down conversion via isolated high-frequency transformer and PWM modulation circuit. Compared with linear power supply, it reaches over 85% conversion efficiency with lower heat generation and cabinet power consumption, suitable for long-term continuous operation in sealed narrow control cabinet space.
2.2 Multi-Channel Isolated Graded DC Output Unit
Multiple independent isolated power branches are designed inside the board to avoid whole-board power cut caused by short circuit of a single load branch. It distinguishes precision regulated output (for main CPU, communication chips and sampling circuits with ±5% voltage tolerance) and high-power unregulated output (for relays, drive loops and power-type I/O boards). The output specification strictly matches the hardware power demand of full Mark VI series boards; replacement with other RAPA versions without authorization is prohibited.
2.3 Hardware ID & Backplane Bus Interaction Unit
A 1024-bit serial memory chip is integrated to solidify part number, hardware revision and factory verification code. After rack power-on, the board uploads identity information to the main controller via BRDID bus automatically. The system configuration will pop up an error and refuse rack initialization if mismatched model is installed.
2.4 Front Panel Indication & Fault Diagnosis Unit
Two LED indicators are mounted on the front panel: IPOK (Input Power OK) and MPOK (Main Output Power OK). A reserved inspection opening contains 4 test points (N15, P5, P15, DCOM) for direct multimeter voltage measurement, plus a manual hardware reset button to unlock locked protection status after fault triggering.
2.5 Full-Link Hardware Fault Lockout Protection Unit
Four pure hardware-level protections are embedded: input under/over voltage, output overcurrent, load short circuit and chip overtemperature, which act without software judgment. Once short circuit or overload occurs on rear-end boards, the power board cuts off corresponding output branch within milliseconds and latches fault state, preventing overcurrent damage to rack backplane and high-value main control cards.
2.6 Industrial Reinforced Conformal Coating & Environmental Adaptation Unit
The entire PCB is coated with conformal coating against moisture, salt fog and corrosion. Integrated aluminum heat sinks are installed on power heating components. Industrial wide-temperature components are adopted with enhanced PCB creepage distance for safety insulation. It resists long-term low-frequency vibration, dust condensation and coastal humid salt fog in power plants, adopting fanless passive heat dissipation via housing and fins with no mechanical wearing parts.
3. Technical Specifications
3.1 Basic Input & Output Electrical Parameters
| Item | Specification |
|---|---|
| Model | IS200RAPAG1BBA Mark VI Rack Power Assembly Board |
| Standard Input | 48V 25kHz Square Wave (Supplied by rack pre-stage drive power supply) |
| ① ±18~24VDC Unregulated Output | Max 400mA, for auxiliary drive circuits |
| ② ±15VDC Regulated Output | ±5% tolerance, max 1.0A per channel, dedicated for analog signal boards |
| ③ ±5VDC Regulated Output | ±5% tolerance, total max 7.0A, core power for CPU & logic chips |
| ④ 24COM Reference Unregulated DC | ±24VDC, max 1.5A, rack common reference power |
| Typical Power Consumption | Approx. 110W |
| Net Weight | 0.9~1.2kg |
| Mounting | Single standard slot plug-in installation on Mark VI rack with front panel latch fixation |
3.2 Diagnosis & Communication Parameters
- Identity Recognition: On-board ROM stores board ID and revision, handshake verification with rack backplane bus automatically on power-up
- Status Indication: IPOK for input power, MPOK for main output; steady on means fully normal operation
- Inspection Access: 4 voltage test points + manual reset button for on-site troubleshooting without configuration software
- Fault Reporting: Fault codes are uploaded to Mark VI upper monitoring HMI and recorded in SOE event log once protection is triggered
3.3 Environmental & Mechanical Compliance
- Operating Temperature: -40℃ ~ +70℃
- Storage & Transport Temperature: -40℃ ~ +85℃
- Humidity: 5%~95%RH non-condensing, no corrosive acid/alkali gas
- Ingress Protection: IP20, for indoor cabinet installation only
4. Product Advantages
- Centralized power distribution for the whole rack via single board, occupying only one slot to supply power for dozens of boards, simplifying cabinet wiring and reducing circuit fault points.
- Electrically isolated separated power supply for analog, logic and power drive loops, avoiding total system power failure caused by short circuit of single I/O card.
- Pre-stage hardware protection cuts off output and locks fault before abnormal current damages CPU and communication boards, minimizing maintenance spare part cost after equipment failure.
- Built-in hardware version anti-mismatch verification prevents rack startup failure and voltage abnormality damage caused by incorrect spare part installation.
- Fanless maintenance-free passive cooling design eliminates fan dust blockage failure, supporting over 5 years stable unattended operation in dusty power plant environments.
- Drop-in plug-and-play replacement with no secondary wiring modification required after power-off insertion, greatly shortening unit outage maintenance duration.
5. Application Scenarios
1. Thermal Power Combined-Cycle Gas & Steam Turbine Mark VI Main Control System
Core power supply card for GE 9FA/6FA gas turbine and steam turbine control cabinets, serving as first-level emergency spare part for power plants.
2. Hydropower Unit Excitation & Governor Control System
Shared rack power supply for EX2100 excitation system and Mark VI governor to guarantee grid-connected stable control of hydropower units.
3. Metallurgy & Captive Power Plant Waste Heat Turbine Retrofit
Direct in-situ replacement for aging power boards with capacitor degradation, voltage drop and frequent protection lockout on legacy Mark VI control systems.
4. Oil & Gas Pipeline Compressor Unit Control Cabinet
Power core for centrifugal and reciprocating compressor Mark VI control cabinets, adapting to sealed explosion-proof cabinet environment with drastic temperature & humidity fluctuation.
5. Legacy Automation System Emergency Maintenance
If no indicator lights on all rack boards, multiple modules report power fault or repeated rack reboot, this RAPA power board shall be prioritized for inspection as the most frequent failure-prone component of Mark VI system.
