DS200RTBAG3A | GE DS200 High Density Output Module In Stock

Description

Product Introduction

The DS200RTBAG3A is a high-density relay output termination board for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It provides 48 independent Form C relay outputs arranged as three isolated banks of 16 relays each. The “A” revision upgrades the terminal blocks from cage clamp to screw type.

The RTBAG3A is essentially three RTBAG1A boards integrated onto a single PCB, but with screw terminals instead of cage clamps. It is designed for applications requiring very dense relay outputs (48 channels) in environments where screw terminals are preferred—high vibration, maintenance teams standardizing on screwdrivers, or replacement of existing screw-terminal boards.

Key Technical Specifications

Key Selling Points & Differentiators

• 48 relays in a single slot with screw terminals – Three independent banks of 16 relays. Replaces three RTBAG1A boards and saves two rack slots. Screw terminals preferred in high-vibration environments.
• Triple bank-to-bank isolation at 1500 VAC – Bank A, Bank B, and Bank C are electrically isolated. Connect each bank to different voltage systems (24 VDC, 120 VAC, 240 VAC) on the same board.
• Removable screw terminal blocks on all 144 terminals – Each 3-position block is removable. Screw terminals with wire protectors prevent strand breakage. Color-coded per bank: Bank A (gray), Bank B (black), Bank C (blue).
• Independent ribbon cables per bank – Use three separate output modules to control each bank independently. Flexible configuration.
• Per-channel LED for visual status – Red LED per relay lights when the coil is energized. Quick troubleshooting across 48 channels.
• QC includes screw torque verification on all 144 terminals – Every screw terminal is torqued to 0.55 Nm at the factory to verify thread integrity.
• 2-year warranty – Covers contact welding, coil failure, LED failure, or any manufacturing defect on any of the three banks.

Frequently Asked Questions (FAQ)

Q: What’s the difference between RTBAG3 (cage clamp) and RTBAG3A (screw terminal)?

Choose RTBAG3A for high-vibration environments (turbine decks, compressor skids) or when your maintenance team prefers screwdrivers. Choose RTBAG3 for fast installation in low-vibration control rooms.

Q: Can I replace a cage clamp RTBAG3 with the screw terminal RTBAG3A without changing my wiring?
A: Yes, electrically. The pinout and relay numbering are identical. However, you will need to re-land all 144 field wires because the terminal blocks have different retention mechanisms (spring vs screw). Allow 6–8 hours for re-termination. The ribbon cables and mounting holes are identical.

Q: How do I connect the RTBAG3A to my Mark V output modules?
A: Three methods. Method 1 (recommended): Use three separate output modules. Connect Bank A (relays 1–16) to output module #1, Bank B (relays 17–32) to module #2, Bank C (relays 33–48) to module #3 via the included ribbon cables. Method 2: Use one output module with 48+ outputs (rare) and the bank select jumpers. Method 3: Use two modules (e.g., one 32-output module for Banks A+B, one 16-output module for Bank C). Jumper configurations documented on board silkscreen.

Q: Can Bank A, Bank B, and Bank C operate at three different field voltages?
A: Yes. Triple isolation allows each bank to switch different voltage systems. Example: Bank A = 24 VDC sensors, Bank B = 120 VAC motor starters, Bank C = 240 VAC pumps. Do NOT mix voltage types within the same bank—all relays in a given bank share the same isolation barrier.

Q: What torque should I use for the screw terminals?
A: 0.5–0.6 Nm (4.4–5.3 lb-in). Do not exceed 0.7 Nm—the brass threads will strip. Use a torque screwdriver. The included torque card lists settings for 12 AWG through 24 AWG. For stranded wire 16 AWG and smaller, ferrules are recommended but not required (wire protector prevents strand breakage).

Q: The board has 144 terminal positions. Are they all accessible?
A: Yes, but requires planning. Terminal blocks are arranged along the bottom edge. Keep 150 mm clearance below the board for wiring access and block removal. Each removable block can be unplugged individually for rewiring without disturbing adjacent channels.

Q: What is the maximum backplane current draw?
A: 720 mA at 24 VDC with all 48 relays energized (48 x 15 mA). Mark V power supplies typically provide 2–5 A on the 24 VDC rail. The RTBAG3A draws 0.72 A. Add all other modules to ensure you don’t exceed the power supply rating. We provide a load calculation worksheet. For heavily loaded backplanes, consider the RTBAG3E (external coil power option—special order).

Q: Can I replace individual relays on the RTBAG3A?
A: Yes. The relays are through-hole soldered, not socketed. Replacement requires desoldering 8 pins per relay. We offer relay replacement service ($18 per relay + return shipping). For high-reliability applications requiring gold-flashed contacts or sealed relays, we offer the RTBAG3ABB (special order). Contact us.

Q: What QC tests do you run on the RTBAG3A?
A: Eleven tests:

1. Visual: 20x magnification of solder joints, screw terminal alignment.
2. Screw torque verification: All 144 screws torqued to 0.55 Nm, logged.
3. Coil resistance (sample): 1.6 kΩ ±5%.
4. Coil current: 15 mA ±2 mA at 24 VDC.
5. Contact resistance: <50 mΩ at 100 mA, four-wire (sample).
6. Bank-to-bank isolation: 1800 VAC between A-B, B-C, A-C. Leakage <0.5 mA.
7. Operate test: Cycle each relay 100 times. No failures.
8. Load test (sample): 5 A resistive, 10,000 cycles. Final contact resistance <100 mΩ.
9. Ribbon cable test: All three cables tested.
10. LED test: All 48 LEDs verified.
11. Bank select jumper test: Verify mapping configurations.

Q: What shipping protection?
A: The RTBAG3A is 420 mm x 220 mm. Anti-static bag, custom foam cradle with cutouts for all 48 screw terminal blocks (blocks shipped installed). Double-wall box with “FRAGILE,” “ESD SENSITIVE,” “LARGE,” and “DO NOT STACK” labels. Each board ships individually. Torque card and accessories in separate bag.

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