Key Technical Specifications
| Parameter | Specification |
|---|---|
| Order Code | IS200SRLYH2AAA |
| Manufacturer | GE (General Electric) |
| Product Family | SRLY / TRLY relay output terminal board |
| System Platform | Mark VIe Speedtronic turbine control |
| Board Type | Relay output terminal board |
| Typical Application | Trip, permissive, alarm, and auxiliary relay outputs |
| Compatible I/O Pack | PDIO (IS220PDIOH1A and related revisions) |
| Compatible Terminal Boards | TDBS (simplex), TDBT (TMR) |
| Optional Sub-Board | WROB (IS200WROBH1A) for fused relay power and sensing |
| Relay Supply | Typically 24 V DC via WROB; default fuse often 3.15 A |
| Mounting | Installed on TDBS/TDBT terminal board assembly |
| Status Indication | LED diagnostics via associated I/O pack |
Product Introduction
The GE IS200SRLYH2AAA shows up when a Mark VIe turbine cabinet needs relay outputs that actually survive a trip test. It belongs to GE’s SRLY/TRLY relay terminal board family and is normally used with PDIO I/O packs on TDBS or TDBT terminal boards. In practice, it handles the dirty work: fuel trip, lube oil permissive, breaker control, fire alarm, ventilation interlocks, and auxiliary outputs that cannot depend on a soft signal alone.What makes this board worth keeping in stock is not fancy marketing language, but architecture. It plugs into an existing Mark VIe relay channel, uses WROB for fused 24 V DC relay power, and keeps relay wiring inside GE’s documented terminal board structure. That matters during a forced outage. You do not want to re-engineer trip wiring because someone bought a “compatible” relay board with different coil voltage or contact ratings. Just be careful: the trailing “AAA” suffix can indicate a specific revision, fuse option, or regional variant. Verify it against the removed board and the GE manual before closing the cabinet.
Quality SOP & Tech Pitfalls
The Lab Report (SOP)
- Visual inspection: confirm order code IS200SRLYH2AAA, serial number, PCB revision, connector condition, and mounting hardware.
- Counterfeit check: verify GE labeling, board finish, connector pin alignment, and WROB sub-board presence if applicable.
- Power-up test: apply 24 V DC relay supply through the correct WROB/TDBT path; check for abnormal current draw.
- Relay output test: energize each relay channel and verify contact operation, coil voltage, and LED indication.
- Insulation check: verify isolation between relay contacts, coil supply, and chassis ground.
- Compatibility check: confirm fit on TDBS/TDBT and correct mating with PDIO pack.
- Packaging: anti-static bag, rigid box, connector pins protected, revision recorded.
The Engineer’s Warning (Pitfalls)
- Do not assume IS200SRLYH2AAA is identical to IS200SRLYH2A or IS200TRLYH1B. The suffix changes matter. I have seen a plant install a “close enough” relay board and spend six hours chasing missing fuse sensing.
- If the WROB board is missing or the wrong revision, relay power distribution and fuse status feedback may not work. The PDIO will see a fault even if the relay itself is fine.
- Never swap this board with the turbine running unless your procedure explicitly allows live I/O replacement. Relay outputs tied to trip circuits are not a place for guesswork.
- Check the fuse rating. Some WROB configurations use a 3.15 A default fuse. Replacing it with a higher value fuse can mask a wiring fault and destroy the relay output.
Installation & Configuration Guide
- Pre-Installation
- Obtain a switching permit and review trip logic impact.
- Photograph existing wiring, WROB board, fuse positions, PDIO connections, and terminal board labels. ⚠️
- Confirm the replacement order code matches IS200SRLYH2AAA exactly.
- Removal
- De-energize the relay supply if permitted by the maintenance procedure.
- Label all relay output wires and WROB connections.
- Remove the board carefully; do not force DC-62 or ribbon connectors.
- Installation
- Verify WROB sub-board presence and fuse ratings.
- Seat the board firmly on TDBS/TDBT.
- Reconnect relay outputs with correct polarity and terminal numbers.
- Confirm PDIO pack revision is compatible with the terminal board assembly.
- Power-On & Testing
- Apply 24 V DC relay supply.
- Check for WROB fuse alarms or PDIO fault indications.
- Force each relay output from ToolboxST or the approved configuration tool.
- Verify contact closure, LED status, and SCADA/DCS feedback.
- Perform a controlled trip simulation only after all outputs are verified.
Compatible Replacement Models
| Compatibility | Model / Option | Notes |
|---|---|---|
| ✅ Drop-in Replacement | IS200SRLYH2AAA | Same order code, same Mark VIe SRLY/TRLY terminal board role. |
| ⚠️ Revision Dependent | IS200SRLYH2A | Similar SRLY family board; suffix and revision must be verified. |
| ⚠️ Application Dependent | IS200TRLYH1B / IS200TRLYH1BGF | TRLY relay output boards used in Mark VIe; contact rating and mounting may differ. |
| ⚠️ Requires Verification | IS220PDIOH1A + TDBT/TDBS | PDIO pack is not a direct board swap; it is the I/O pack that drives the relay terminal board. |
| ❌ Not a Direct Swap | Mark V analog I/O boards | Different platform, different connectors, different application. |
Frequently Asked Questions (FAQ)
Is IS200SRLYH2AAA still in production?
No. GE has discontinued many legacy Mark VIe I/O boards. Available stock is typically new surplus or new original. Verify test records before acceptance.Can I substitute IS200SRLYH2A for IS200SRLYH2AAA?
Not without checking the suffix. The “AAA” ending can indicate a specific revision, fuse option, or configuration. If the removed board is AAA, replace it with AAA unless GE documentation confirms equivalence.Does this board include the WROB fuse board?
Not always. Some assemblies ship with WROB installed; others do not. If your cabinet uses fused relay power sensing, a missing WROB will cause faults.Can I hot-swap this relay board?
Only if your Mark VIe maintenance procedure and plant safety rules allow it. Relay outputs tied to trip circuits should never be changed casually.What causes relay output faults after replacement?
Most often it is a missing WROB board, wrong fuse rating, loose connector, or incorrect PDIO revision. Wiring errors on trip outputs are less common but more dangerous.Is this a Mark V or Mark VIe board?
Public listings conflict. GE Mark VIe documentation places SRLY/TRLY/WROB/TDBT in the Mark VIe architecture. Treat any “Mark V analog I/O” description as unverified unless confirmed by the OEM nameplate and manual.What should I check before accepting stock?
Order code, PCB revision, WROB presence, fuse values, connector condition, and a basic relay output test report. If the seller cannot confirm these, do not treat it as verified.
