DS200PTBAG1A | GE Mark V Termination Board

Description

Product Introduction

The DS200PTBAG1A is a termination board for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It sits between field devices (sensors, valves, transmitters) and the I/O modules in the main rack, providing a safe, organized point for field wiring termination.

Unlike generic terminal strips, the PTBAG1A includes per-channel fusing, status LEDs for power and signal presence, and a dedicated 24 VDC field power distribution bus. This reduces cabinet wiring time by 60% compared to point-to-point wiring. No configuration, no firmware—pure passive termination with overcurrent protection.

Key Technical Specifications

Key Selling Points & Differentiators

• Per-channel fusing with easy access – Each of the 64 positions has a replaceable 5×20 mm fuse. Blown fuse? Pop it out, replace it, back online in 30 seconds. No soldering, no board removal. Spare fuses included.
• Grouped field power distribution – Four isolated 24 VDC buses, each rated at 10 A. You can power sensors from one bus, valve solenoids from another, and keep them isolated to prevent cross-talk.
• LED indication per channel (optional) – Populate the jumper and install LEDs for visual status of each field signal. Saves hours of troubleshooting with a meter. We include sample LEDs in the accessory kit.
• No firmware, no configuration – Passive termination board. Works with any Mark V I/O module: analog input (DS200ADPBG), digital input (DS200DDCBG), or output modules. Zero compatibility issues.
• QC includes continuity and isolation testing – Every channel tested for continuity from terminal to ribbon cable pin. Isolation tested between groups: 1500 VAC for 1 minute, leakage under 5 mA.
• 2-year warranty – Covers terminal breakage, fuse holder failure, or any manufacturing defect.

Frequently Asked Questions (FAQ)

Q: What’s the difference between DS200PTBAG1A and the older PTBAG1 (non-A)?
A: The “A” revision adds two improvements. First: wider trace width on the 24 V power buses—original was 2 mm, now 4 mm. Handles 10 A continuous without overheating. Second: fuse holders are now individually removable for replacement without prying. On the original, we’ve seen technicians break the holders trying to extract blown fuses. The A revision solves that.

Q: Can I use this board with non-GE I/O modules?
A: The physical termination works with any 64-pin ribbon cable. But the pinout is specific to GE Mark V I/O mapping. If you’re using a third-party PLC or I/O system, you’ll need a pinout adapter or custom cable. We provide the full pinout diagram with each board. Honest advice: stick with GE I/O modules for plug-and-play.

Q: Do I need external fuses if the I/O module has built-in protection?
A: Yes—and here’s why. The fuses on the PTBAG1A protect the field wiring and the field device, not the I/O module. A short in a field cable can draw hundreds of amps from the 24 V supply. That melts wire insulation and starts cabinet fires. The 1 A fuse blows first, isolating the fault. We’ve seen melted harnesses exactly from this scenario. Install the fuses.

Q: How do I know which fuse corresponds to which field terminal?
A: The board is silkscreened with terminal numbers (1 through 64) and matching fuse labels. Fuse F1 protects terminal 1, F2 protects terminal 2, and so on. The silkscreen is UV-resistant and rated for 20 years in cabinet conditions. We’ve also seen customers use the included adhesive number strips for redundant labeling.

Q: What’s the maximum cable length from this termination board to the field device?
A: Depends on signal type. For 24 VDC discrete signals: 1,000 ft (300 m) with 18 AWG. For analog 4–20 mA loops: 2,000 ft (600 m) with shielded twisted pair. For thermocouple or RTD: 500 ft (150 m) maximum to avoid noise pickup. The termination board itself adds no signal degradation—it’s purely passive. But your I/O module’s input impedance and noise rejection determine the real limit.

Q: Can I hot-swap field wiring while the system is powered?
A: The PTBAG1A itself allows it—you’re just landing wires on screw terminals. But the connected I/O module sees the signal changes. If you short +24 V to a digital input ground, you might trip the module’s protection or blow the fuse. We recommend de-energizing the 24 V field power bus before re-wiring. The board has a dedicated 24 V disconnect jumper for exactly this purpose.

Q: My existing PTBAG1A has burnt traces on the 24 V bus. Will the PTBAG1A fix this?
A: Yes. The “A” revision increased trace width from 2 mm to 4 mm and added extra solder mask on the power planes. Original boards failed at sustained 8 A loads. The PTBAG1A handles 10 A continuous with a 30°C temperature rise. We’ve tested it at 12 A for 24 hours—no trace damage, but the board runs at 75°C. Stay at or under 10 A per group.

Q: What QC tests do you run on these termination boards?
A: Six tests:

1. Visual: Solder joint inspection under magnification. Cracked joints get reflowed.
2. Continuity: Every terminal to its corresponding ribbon cable pin. Resistance under 0.1Ω.
3. Isolation: 1500 VAC for 1 minute between adjacent terminals (random sample of 20 pairs). Also between power bus groups.
4. Fuse holder grip test: Each fuse holder tested with a known-good 1 A fuse. Insertion and removal force measured. Too loose? Reject. Too tight? Reject.
5. LED test (if populated): Verify each LED lights with 24 VDC applied. Polarity verified.
6. Thermal imaging: Board powered at 24 VDC, 10 A load on each bus for 1 hour. Hot spots >85°C trigger rejection.

Q: What shipping protection do you use?
A: The board is wrapped in anti-static foam, placed in a static-shielding bag, then boxed with cardboard dividers to prevent terminal bending. We also include a silica gel pack. For orders of 5+ boards, each PTBAG1A gets its own bag and foam layer—no stacking that could bend terminal pins.

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