IC3600SHPB1D1B - Single Shaft Auxiliary Card

SPECIFICATIONS

Part No: IC3600SHPB1D1B
Manufacturer: General Electric
Function: Single Shaft Auxiliary Card
Series: Mark I and II
Repair: 3-7 Day
Availability: In Stock
Country of Manufacturer: United States (USA)

Functional Description

IC3600SHPB1D1B is a Single Shaft Auxiliary Card developed by GE. It is a part of Mark I and II control system. This multifunctional card contains several electronic circuits, primarily focused on speed control and sensor signal integrity. While the SHPB card may serve multiple roles in the control system, the following description focuses on the circuitry associated with speed control and sensor fault detection.

Core Functions

• Redundant Speed Signal Processing: The card features a cross-coupling network designed to combine the speed feedback signals from two magnetic pick-up (MPU) sensors. This design increases system reliability by ensuring that
  • If either of the two sensors fails (loss of signal), the feedback signal is still maintained.
  • The outputs from both MPUs (referred to as RSZ and SZA) are tied together, effectively blending the signals to provide robust feedback to the turbine control loop.
  • This approach supports continuous operation and reduces the risk of signal loss due to a single point of failure in the speed sensing mechanism.
• Zero Speed Detection: Input pulses from the magnetic pick-up (designated MPR) are processed by the card.
  • Corresponding output pulses are generated on RSR, which is used by the control system to determine a zero-speed condition.
  • This feature is critical during startup and shutdown phases, where accurate speed status is required for sequencing and safety interlocks.
• Fault Detection – Open and Short Monitoring: The SHPB card also includes built-in diagnostic circuits to detect open circuits or shorts in the MPU wiring.
  • Open circuit between MPZ and ACOM: Results in a logic 1 on output FLTZ, triggering the FLTZ indicator light. This signals a potential disconnection or break in the sensor line.
  • Short or open circuit between MPR and ACOM: Causes a logic 1 on output FLTR, illuminating the FLTR indicator light. This indicates a shorted or broken wire between the sensor and common reference.

Other Features

• While the  card may include other circuitry used elsewhere in the control system, this description covers only the speed control and signal integrity functions.
• The card plays a key role in ensuring reliable and accurate speed feedback, a fundamental parameter in turbine operation, protection, and performance optimization.
• It enhance system safety and diagnostic capability, allowing operators and maintenance teams to quickly identify and respond to sensor wiring issues.

WOC is happy to assist you with any of your GE requirements. Please contact us by phone or email for pricing and availability on any parts and repairs.

FREQUENTLY ASKED QUESTIONS

What is IC3600SHPB1D1B?
It is a Single Shaft Auxiliary Card developed by GE.

How does the SHPB card improve reliability in speed sensing?
It features a cross-coupling network that combines signals from two MPU sensors. If one sensor fails, the card still provides a valid speed feedback signal, reducing the chance of system trips due to sensor failure.

What are RSZ and SZA?
RSZ and SZA are output terminals where the speed signals from the two MPU sensors are tied together. This allows the system to use a blended signal for better redundancy and stability.

What is the purpose of the RSR output?
RSR provides a pulsed output derived from the MPR input. It is used to detect zero-speed conditions in the turbine, which is critical during startup, shutdown, or emergency scenarios.