GE IS200VRTDH1DAC | Mark VIe VRTD RTD Input Terminal Board – Surplus Stock

Description

Key Technical Specifications

Product Introduction

The GE IS200VRTDH1DAC is an RTD input terminal board from the IS200VRTDH1D family, used in GE Speedtronic Mark VI and Mark VIe turbine control systems. Its job is to accept field RTD temperature signals — typically bearing, exhaust, lube oil, coolant, and process temperature measurements — and pass them through the VME backplane to the controller for scaling, linearization, and alarm/trip logic.The “DAC” suffix is a revision identifier. In GE IS200 boards, suffix changes can indicate connector layout, RTD type support, calibration constants, or terminal block differences. I have seen plants order what they thought was a direct replacement only to find the terminal block pinout did not match the existing wiring, or the new board expected a different RTD curve. The hardware may look identical, but the DAC revision is not automatically interchangeable with DAB, DAA, or other VRTDH1D suffixes without verification.

Quality SOP & Tech Pitfalls

The Lab Report (SOP)

1. Visual and counterfeit check: verify GE labeling, IS200VRTDH1DAC, revision, and serial number.
2. Connector inspection: check terminal blocks and backplane connectors for bent pins, corrosion, or cracked housing.
3. PCB inspection: check for burn marks, swollen capacitors, or cold solder joints on signal traces.
4. Continuity check: verify pin-to-pin continuity against the OEM wiring diagram using a Fluke 115 or equivalent.
5. Insulation check: confirm no shorted signal paths between adjacent RTD channels.
6. LED indicator check: verify all three status LEDs illuminate correctly during power-on.
7. Backplane connector check: verify both backplane connectors seat firmly with no bent pins.
8. Anti-static packing: seal with foam, protect terminal blocks and backplane connectors, and label revision clearly.

The Engineer’s Warning (Pitfalls)

• Do not assume IS200VRTDH1DAC is interchangeable with IS200VRTDH1DAB or other suffixes. The RTD type, terminal layout, or calibration may differ.
• Some surplus listings misidentify IS200VRTDH1D boards as Mark V analog I/O boards. That is incorrect. The VRTDH1D family is an RTD input board for Mark VI/VIe, not a general-purpose analog signal board.
• RTD wiring errors are the most common cause of false temperature trips. A single loose 3-wire RTD connection can read as an open circuit, triggering a high-temperature alarm or trip. Always verify wiring resistance and lead balance before energizing.
• I once saw a plant replace a VRTD board during a scheduled outage and discover the new unit had a different terminal block arrangement. Half the RTD channels read open circuit after startup. The board was fine — the wiring did not match. Always photograph the existing wiring before removal.

Installation & Configuration Guide

1. Pre-Installation ⚠️
   • Follow GE Mark VI/VIe maintenance procedures and obtain proper work authorization.
   • Photograph the existing board label, terminal wiring, LED status, and adjacent modules.
   • Record active diagnostics and RTD channel assignments.
2. Removal
   • De-energize the I/O rack per GE procedures.
   • Label every RTD terminal wire before disconnection.
   • Release the board retaining hardware carefully; do not force backplane connectors.
3. Installation
   • Verify the revision suffix matches the existing board or is approved by GE documentation. This prevents most wiring mismatches.
   • Inspect terminal blocks and backplane connectors before seating the board.
   • Seat the IS200VRTDH1DAC firmly and reinstall all retaining hardware.
   • Reconnect RTD wiring exactly as documented, verifying 3-wire lead assignments.
4. Power-On & Testing
   • Restore power per GE startup procedures.
   • Verify LED status indicators and controller diagnostics.
   • Check each RTD channel reading against known temperature references.
   • Confirm no open-circuit or out-of-range faults appear.
   • Document the replacement and update the spare parts log.

Compatible Replacement Models

Frequently Asked Questions (FAQ)

What does IS200VRTDH1DAC do?
It is an RTD input terminal board for GE Mark VI/VIe turbine control systems, accepting up to 16 three-wire RTD temperature inputs and routing them to the controller via the VME backplane.Is IS200VRTDH1DAC the same as IS200VRTDH1DAB?
Not automatically. Both belong to the VRTDH1D RTD board family, but the suffix can indicate different RTD types, terminal layouts, or revisions. Verify against GE documentation before substituting.Is this a Mark V or Mark VI board?
The VRTDH1D family belongs to Mark VI/VIe. Some third-party listings incorrectly describe IS200VRTDH1D boards as Mark V analog I/O boards; that description is wrong and likely copied from IS200BPVCG documentation.How many RTD channels does it support?
The IS200VRTDH1D family supports 16 three-wire RTD inputs. Confirm the exact channel count and RTD type for the DAC suffix against the physical nameplate.Can I hot-swap this board?
Only if your GE Mark VI/VIe maintenance procedure explicitly allows it. RTD inputs may feed temperature trip logic, so uncontrolled removal can cause unintended equipment behavior.Is it still available from GE?
Treat it as discontinued. Remaining supply comes from surplus stock or removed-from-service units. Verify revision, terminal condition, and backplane connector integrity before purchase.What should I send for verification?
Photos of the nameplate, terminal block wiring, backplane connectors, LED panel, adjacent I/O modules, and any active controller diagnostics. That eliminates most misidentification risk.