IS200SPROH1A GE Mark VIe Backup Protection Terminal Board

Product Overview – IS200SPROH1A Backup Protection Terminal Board

IS200SPROH1A is a Backup Protection Terminal Board from General Electric for the Mark VIe series. It hosts a PPRO I/O pack and conditions speed signals from magnetic pickups. This board also houses two potential transformers (PTs) for generator and bus voltage sensing. Designed for gas turbine control systems, it ensures reliable backup protection in critical industrial environments.

Technical Specifications – Core Parameters

• Part Number: IS200SPROH1A – Manufacturer: General Electric
• Series: Mark VIe – Type: Backup Protection Terminal Board
• Relay channels: 12 – Generator & bus voltage sensors: 2
• Magnetic speed pickup: 2 Hz pulse rate range, 27 mV sensitivity
• Power requirements: +5 V DC @ 6 A; 24 V DC supply
• Mounting: DIN-rail (with sheet metal carrier) – Technology: Surface mount
• Operating temp: 30…65 °C – Size: 15.9 x 17.8 cm
• Country of Origin: United States – Manual: GEH-6721D
• Terminal options: SPROH1A = 24 barrier terminals (pluggable block) / SPROH2A = 24 Euro-style box terminals

Hardware Layout & Component Highlights

• Left edge occupied by a large black terminal block – fully removable for board replacement.
• Two red transformers (with yellow/black tops) in a horizontal row on the upper right.
• Below transformers: two spaces for yellow resistors with single black band.
• Six rectangular black diodes arranged in 2 vertical rows of 3 each.
• Three small solid yellow capacitors in a horizontal line below diodes.
• Additional silver capacitors near the center-right of the PCB.
• Two connector ports on the right half + a green terminal block on the left.

Installation & Wiring Guide

• Mounting: Attach SPRO with plastic insulator to sheet metal carrier – then snap onto DIN rail. Or bolt carrier directly to panel.
• Wiring: Use #18 AWG wires for speed signals and PT inputs to terminal block.
• Terminal block (SPROH1A): Removable barrier type – simplifies board swap.
• PPRO connection: I/O pack mounts directly onto JA1 connector of the SPRO.
• Backup trip link: Connect DC-37 cable from JA3 connector to the backup trip terminal board.

Operational Terminal Map

• Terminals 1–4: PT inputs for generator/bus voltage sensing.
• Terminals 19–24: Three speed inputs from magnetic pickups.
• Terminals 7–15: Reserved for future expansion – routed directly to JA1 (PPRO connector).
• Terminals 5–6 and 16–18: No connection (unused).
• JA1: Hosts the PPRO I/O pack – JA3: Connects to backup trip terminal board cable.

Oiltech Controls’s Insight – Practical Experience

• This board is a critical component in GE turbine backup protection – always keep a spare on hand.
• Common failure point: terminal block corrosion in humid environments – inspect regularly.
• Use shielded twisted-pair cables for speed pickup signals to avoid noise interference.
• When replacing, verify PT polarity – reversed wiring can cause incorrect voltage sensing.
• Firmware compatibility: ensure your PPRO pack firmware matches the Mark VIe system version.

Which Equipment Works Best with IS200SPROH1A?

• GE Mark VIe distributed turbine control systems.
• PPROH1A I/O packs for backup protection logic.
• Backup trip relay terminal boards (via JA3 DC-37 cable).
• Magnetic speed pickups (2 Hz to 27 mV range).
• Potential transformers (PTs) for bus/generator voltage measurement.

Frequently Asked Questions – Professional Selection Guide

• Q: What is the difference between SPROH1A and SPROH2A?
  The SPROH1A has a barrier terminal block (pluggable), while SPROH2A uses Euro-style box terminals. Both are functionally identical – choose based on your wiring preference.
• Q: Can I use this board with a Mark VI (non-e) system?
  No, the IS200SPROH1A is specifically designed for Mark VIe. Mark VI uses different backplane and connector standards.
• Q: How do I test the speed pickup inputs?
  Inject a 2 Hz square wave (27 mV amplitude) at terminals 19–24 and monitor the PPRO pack response via system diagnostics.
• Q: What is the maximum cable length for PT inputs?
  Keep PT wiring under 30 meters to minimize voltage drop and noise – use twisted shielded pairs.
• Q: Is the terminal block field-replaceable?
  Yes, the barrier block on SPROH1A is fully removable – you can replace it without soldering.

Package, Warranty & Shipping

• Package contents: 1x IS200SPROH1A board (terminal block included), 1x plastic insulator, mounting hardware (carrier not included).
• Warranty: 12-month warranty against defects – full technical support.
• Shipping: 24-28 hours dispatch – carriers: FedEx, UPS, DHL with global tracking.

Why Choose Oiltech Controls?

• 15+ years supplying industrial automation spares.
• Global delivery with real-time tracking.
• Every unit tested for function and safety before shipment.
• Refurbished and industrial surplus options available (fully verified).
• Expert help for obsolete systems – including GE Mark VI/VIe and more.
• 12-month warranty included with every purchase.

Contact us:
info@oiltechcontrols.com |
+86 158 8020 0923 (WhatsApp)

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