DS200AAHAH2A | GE Mark V Board | OEM Fast Shipping

Description

Product Introduction

The GE DS200AAHAH2A is an analog I/O termination board for the Mark V Speedtronic turbine control system. It terminates field wiring from pressure transmitters, thermocouple conditioners, and actuator position feedback. This H2A variant uses a different input mapping than the H1, specifically designed for applications requiring direct 4–20 mA loop power.

Core advantage: The H2A revision integrates loop power supplies for two-wire transmitters directly on the board. No external power supply or resistor networks needed. This reduces termination cabinet clutter and cuts installation time by roughly 45 minutes per loop. Field experience shows fewer cold solder joints compared to H1 with external add-on resistors.

Key Technical Specifications

Key Selling Points & Differentiators

• Built-in transmitter power supply – H2A provides 24 V loop power for four two-wire transmitters. H1 requires external supply. Saves panel space and wiring labor.
• Differential inputs reduce noise – Six differential channels handle long field runs better than H1 single-ended. Common mode rejection rated at 80 dB at 60 Hz.
• No firmware to corrupt – Pure termination board. Swap directly after labeling wires. No config file backups required.
• Live tested with real transmitters – Each board connects to a Rosemount 3051 simulator and a 4–20 mA loop checker. We verify linearity from 4.00 mA to 20.00 mA ±0.05 mA.
• QC includes leakage test – Loop power outputs checked for leakage current (<50 µA) with transmitter disconnected. Catches failed power regulators before shipment.
• 30-day warranty with cross-ship – Fail on your bench? We send a replacement the next business day and pay return freight.

Frequently Asked Questions (FAQ)

Q: What is the difference between DS200AAHAH1AED and DS200AAHAH2A?
A: The H1 gives you eight single-ended 0–10 V inputs and four outputs. The H2A gives you six differential inputs (software-selectable for voltage or current) and only two outputs. H2A also has built-in 24 V loop power for four two-wire transmitters. Pick H1 for voltage-only signals like potentiometers. Pick H2A for mixed 4–20 mA loops with long cable runs.

Q: Can I use H2A to replace a failed H1 without rewiring?
A: No – terminal assignments are different. H1 uses channels 1-8 on one terminal block. H2A uses a 10-position block with shared commons. In our experience, direct replacement without modifying the field termination cabinet causes channel cross-talk and incorrect readings. You need the H2A wiring diagram and at least two hours to re-land wires.

Q: How do you test the 4–20 mA inputs on surplus boards?
A: We inject 4.00 mA, 12.00 mA, and 20.00 mA using a Fluke 789 process meter. Each channel must read within ±0.1 mA at the 40-pin connector. We also test loop power output under full load (25 mA) and verify voltage stays above 22 V DC. Failing boards get rejected. You get a printed test record with each shipment.

Q: Is the DS200AAHAH2A compatible with Mark VI or Mark VIe?
A: No. Pin mapping on the 40-pin ribbon cable changed after Mark V. Forcing this board into a Mark VI backplane will short the 24 V loop power supply to ground. We have seen customers blow backplane fuses attempting this. Use only in Mark V racks.

Q: Your board has bent pins on the 40-pin connector. Can I straighten them?
A: We recommend returning it instead. Bent pins often have micro-fractures at the solder joint. Straightening works temporarily, but thermal cycling in a turbine cabinet will crack the joint within weeks. Take photos within 48 hours – we cross-ship a replacement at no charge.

Q: Do I need external terminating resistors for the H2A analog inputs?
A: No for 4–20 mA mode. The H2A has built-in 250 Ω precision resistors (0.1% tolerance) switched in when you select current mode via the jumper block. For voltage mode, input impedance is 100 kΩ. Do not add external resistors – they parallel with the internal ones and create scaling errors.

Q: Can this board handle thermocouple inputs directly?
A: No. The H2A does not have cold junction compensation or a high-impedance thermocouple amplifier. You must use a separate thermocouple conditioner (like the DS200TCT series) and feed its 0–10 V or 4–20 mA output into this board. Direct connection will give you meaningless millivolt readings.

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