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Phone: +86 16626708626Description
Key Technical Specifications
- Manufacturer: General Electric
- Series: EX2100 / Speedtronic Mark‑V turbine control systems
- Function: RTBA Relay Terminal Board (RTBA)
- Application: Turbine excitation and drive control signal switching
- Voltage rating: Up to 250 V AC or DC per contact
- Current rating: 2 A per contact
- Coil voltage: 12 V DC
- Number of relays: 8 (DPDT and 4PDT types)
- Mounting: DIN‑rail or cabinet‑mounted board
- Operating temperature: −20 °C to +70 °C
- Protection: 130 V AC metal oxide varistors (MOVs) on I/O
- Size: 16.5 cm H × 17.8 cm W, approx.
- Weight: Under 1 kg
- Manual reference: GEI‑100167B
Product Introduction
GE DS200RTBAG2A (RTBA Relay Terminal Board) is an interface relay board used in GE EX2100 and Speedtronic Mark‑V turbine‑excitation systems. It provides isolated relay contacts for control signals such as trip outputs, alarm indicators, and interlock logic between the I/O controller and field equipment.
Buyers typically choose this board when replacing an identical DS200RTBAG2A that has failed or shows degraded contact behavior. The main advantage is that the layout and contact arrangement are identical to the original design, so no rewiring or logic changes are needed. However, the unit is obsolete, so stock is limited and must be matched exactly.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Output relay never energizes | Failed coil driver, wiring break, or bad control signal | ✅ High | Measure 12 V DC at the relay coil; check control input from the LTB board | Replace the relay or verify upstream control card if wiring is good |
| Relay energizes but contact does not switch | Worn or burnt relay contacts | ✅ High | Measure continuity across the contact while energized | Replace the specific relay; the RTBA allows individual relay swaps |
| Output trips intermittently | Loose terminal block or MOV failure | ✅ Medium | Inspect terminal torque and check for charring or MOV failure | Re‑tight terminals and inspect MOVs; replace if damaged |
| No continuity on any contact | Wrong relay type or reversed wiring | ✅ High | Verify wiring diagram and polarity on the relay board | Confirm wiring matches the original board before re‑installing |
| Board reads “fault” but no LED on | Dead relay or upstream I/O fault | ✅ Medium | Check status LEDs on the 531X307LTB or LAN‑IO board | Isolate the chain: LTB → RTBA → field device |
| Unit fails after swap | Wrong part number or ESD damage | ✅ High | Compare markings and revision; inspect PCB for burns | Confirm exact DS200RTBAG2A type and use ESD protection |
If the issue persists, contact technical support with photos of the board, wiring labels, and any LTB/RTBA alarm codes from the control system.
- DS200RTBAG2A
- DS200RTBAG2A
Frequently Asked Questions
Can I plug DS200RTBAG2A into any EX2100 or Mark‑V cabinet?
Yes, but only into the RTBA‑designated slot in the excitation or drive cabinet. The relay‑logic and wiring are location‑specific; inserting it in a different slot or cabinet can cause mis‑logic or no operation.
Is this relay board hot‑swappable?
No. Power down the cabinet section before removing or inserting DS200RTBAG2A. High‑voltage field connections and live excitation circuits can arc or injure someone if the board is pulled under load.
Will this keep the same alarm/trip behavior as the old board?
Yes, as long as the wiring, relay type, and contact configuration are identical. The RTBA is a “dumb” relay board; all logic lives in the upstream LTB and application program. If the wiring or relay model differs, timing or contact life can change.
Why is this cheaper than factory‑new stock?
Because DS200RTBAG2A is a legacy EX2100/Mark‑V component. New units are typically pulled from surplus or decommissioned plants, not from current‑production GE lines. That lowers the price but also means you must match the exact variant and revision.
What should I check before installing this board?
- Match the exact model and trace code.
- Verify wiring diagrams and terminal numbers against the old board.
- Inspect all MOVs and relay contacts for physical damage.
- Use a grounded wrist strap and anti‑static mat when handling the board.
Is this board repairable if one relay fails?
Yes. Individual relays on the DS200RTBAG2A can be replaced; the RTBA‑design supports field‑removal of K20–K29 relays. However, once the board is out of the factory‑repair channel, availability of replacement relays can be limited.
Does this board store any configuration or firmware?
No. The RTBA is a passive relay‑terminal board; it holds no firmware or settings. Logic and timing are all in the control card and EX2100/Mark‑V software. As long as the wiring and relay type are correct, the system behavior should not change after a swap.
