Product Core Brief
- Model: IS200AEADH4A
- Part Number: 109W3660P001
- Brand: GE (General Electric)
- Series: Speedtronic Mark VI — AEAD Analog I/O Board
- Core Function: Analog signal acquisition and conditioning board for processing turbine control signals (pressure, temperature, position, vibration) in GE Mark VI turbine control systems.
- Product Type: Analog I/O Board
- Key Specs: 12 relay channels | 3 vertical pin terminal strips (12 pins each) | Hardware + software filtering | VME rack mount | 24VDC relay COM | Operating temperature 30°C to 65°C
- Condition: New Original / New Surplus
Product Introduction
The GE IS200AEADH4ADA (Part Number 109W3660P001) is an analog I/O board from GE’s Mark VI Speedtronic turbine control series. It serves as a critical interface between the Mark VI controller’s VME rack backplane and field analog devices, providing signal acquisition, conditioning, and relay output capabilities in gas turbine, steam turbine, and BOP (Balance of Plant) control applications.
This board features 12 relay channels for discrete output control, with relay COM powered by 24VDC. It includes three vertical pin terminal strips, each with 12 pins, arranged in parallel on the board for field wiring connections. The board supports multiple analog signal types including LVDT position feedback, thermocouple temperature, 4-20mA current loop, vibration, and voltage inputs, with signal scaling and conditioning performed on-board.
For noise immunity, the board employs a dual-layer filtering approach. The first 10 circuits (J3) are equipped with hardware filters featuring a single-pole roll-off at 500 rad/s, while the second set of 10 circuits (J4) includes a two-pole roll-off filter at both 72 and 500 rad/s. Additionally, software-configurable two-pole low-pass filters are available with selectable cutoff frequencies of 0, 0.75, 1.5, 3, 6, and 12 Hz, allowing engineers to tailor noise suppression to specific signal characteristics.
The board is designed for VME rack mounting (13 or 21 slot configurations) and includes two heatsink assemblies and eight relay components grouped together. Corner mounting holes allow for secure installation. The board communicates with other Mark VI boards via plug-in connectors, including a right-angle connector on the right edge for backplane communication.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | GE (General Electric) Industrial Systems |
| Product Family | Speedtronic Mark VI |
| Board Type | AEAD Analog I/O Board |
| Part Number | 109W3660P001 |
| Relay Channels | 12 |
| Relay COM Voltage | 24VDC |
| Terminal Strips | 3 vertical pin terminal strips, 12 pins each |
| Analog Signal Support | LVDT, thermocouple, 4-20mA, vibration, ±10VDC |
| Hardware Filter (J3, Ch 1-10) | Single-pole roll-off at 500 rad/s |
| Hardware Filter (J4, Ch 11-20) | Two-pole roll-off at 72 and 500 rad/s |
| Software Filter | Two-pole low-pass, cutoff: 0 / 0.75 / 1.5 / 3 / 6 / 12 Hz |
| Mounting | VME rack (13 or 21 slot), corner mounting holes |
| Operating Temperature | 30°C to 65°C |
| Weight | ~2 lbs (~0.9 kg) |
| Connectors | Plug-in connectors, right-angle connector (right edge), 3PL data bus |
Quality Control Process
Every IS200AEADH4ADA board goes through a four-stage bench check before shipping. First, a visual inspection under magnification checks for cold solder joints, cracked traces, and terminal strip pin damage — common failure points on analog boards exposed to turbine-deck vibration and thermal cycling. Second, we power up the board on a verified Mark VI VME test rack and confirm the 24VDC relay COM circuit reads within spec using a Fluke 87V. Third, we inject calibrated signals across all supported analog input types (LVDT, thermocouple, 4-20mA, vibration) and verify acquisition accuracy against a precision reference meter, confirming proper hardware and software filter operation. We also verify all 12 relay channels actuate correctly. Fourth, we confirm all terminal strip connectors and the right-angle backplane connector establish proper communication. Finally, the board is sealed in anti-static foam with desiccant — no exceptions.
Replacement Pitfall Guide
❗ Hardware vs. software filter configuration mismatch. The AEAD board has both hardware filters (fixed cutoff frequencies) and software-configurable filters (selectable cutoff: 0/0.75/1.5/3/6/12 Hz). If the software filter cutoff is set incorrectly for the signal type (e.g., a fast-changing LVDT position signal with a 0.75 Hz cutoff), the controller will read a delayed or attenuated signal, potentially causing control instability. Always verify the software filter settings match the original configuration before swapping.
❗ Relay COM voltage verification. The 12 relay channels are powered by 24VDC relay COM. If the 24VDC supply is missing or out of spec, the relays will not actuate even if the board itself is functional. Always verify the 24VDC relay COM supply before troubleshooting relay output failures.
❗ Terminal strip pin assignment. The board has three vertical pin terminal strips (12 pins each). Pin assignments vary depending on the signal type and application. Swapping the board without verifying the pin-to-signal mapping can cause incorrect signal routing. Always export the original terminal strip wiring diagram before swapping.
❗ VME rack slot assignment. The AEAD board must be installed in the correct VME rack slot as defined by the system configuration. Installing the board in the wrong slot can cause address conflicts and communication failures. Verify the slot assignment against the system documentation.
❗ 3PL data bus connection. The board communicates with other Mark VI boards (STCA, TCQA, TCQE) via the 3PL data bus connector. A loose or damaged 3PL connector will cause loss of communication with the controller. Verify the 3PL connector is fully seated and the locking mechanism is engaged.
❗ Heatsink integrity. The board includes two heatsink assemblies for thermal management of power components. Damaged or detached heatsinks can cause overheating and premature component failure. Inspect the heatsinks for proper attachment and thermal paste condition during replacement.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor Model | Compatibility Level | Migration Notes |
|---|---|---|---|
| IS200AEADH4ADA (same part, new revision) | Direct | Verify firmware version and filter configuration | |
| IS200AEADH1A | Needs Adaptation | AEADH1A may have different relay count or filter configuration; verify I/O mapping | |
| IS215WEPAH2BB | Not Compatible | WEPAH2BB is Mark VIe series; different backplane, firmware, and I/O mapping | |
| IS220PAICH2A | Not Compatible | PAICH2A is Mark VIe series; different form factor and I/O configuration |
Benchmarks:
- 12 relay channels with 24VDC relay COM
- Hardware + software dual-layer filtering (500 rad/s hardware, 0-12 Hz software selectable)
- 3 vertical pin terminal strips (12 pins each) for field wiring
- VME rack mount with 3PL data bus communication
- Operating temperature 30°C to 65°C
