Overview
The General Electric IS215ISBBH1A, also known as the IS215ISBBH1A ISBB Bypass Module, handles bypass-related signals in the Mark VI turbine control system. It has Transmit Out, Receive In, and Full Duplex connectors. In addition, two front-panel LEDs show receiver activity and bypass status.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | IS215ISBBH1A |
| Brand | General Electric (GE) |
| Series | Mark VI |
| Product Type | ISBB Bypass Module |
| Function | Bypass-related signal handling |
| Transmit Connector | P2 – Transmit Out |
| Receive Connector | P3 – Receive In |
| Full Duplex Connector | P1 – Full Duplex |
| Terminal Block | TB1, 2-position |
| Terminal Marking | 10 mA Max, 24 VDC |
| Status Indicators | Receiver Active, Not Bypassed |
| Enclosure | Rectangular housing with ventilation openings |
| Mounting | Rear mounting provision |
| Origin | USA |
Mark VI Communication and Bypass Interface
The IS215ISBBH1A uses separate connectors for transmit, receive, and full-duplex signals. Meanwhile, its front-panel LEDs help technicians check receiver activity and bypass status.
The TB1 terminal block carries the marking “10 mA Max, 24 VDC.” However, this marking alone does not define the full electrical interface. Therefore, check the GE wiring diagram before connecting an external circuit.
During system integration, verify the connector assignments and signal direction. Also, confirm compatibility with the installed Mark VI hardware before applying power.
Frequently Asked Questions (FAQ)
Q: What do the front-panel LEDs show?
A: The module has two LEDs labeled Receiver Active and Not Bypassed. Check the GE manual for the exact LED states and diagnostic meanings.
Q: What are the functions of connectors P1, P2, and P3?
A: P1 carries the Full Duplex label, while P2 identifies Transmit Out and P3 identifies Receive In. Before wiring, compare these labels with the approved system diagram.
Q: What electrical limit appears on TB1?
A: TB1 carries the marking “10 mA Max, 24 VDC.” However, the available information does not define the circuit function or all connection limits. Confirm these details in the relevant GE documentation.
Field Installation Guidelines
- First, check the complete model number and board revision against the Mark VI hardware documentation.
- Next, install the module in the designated position and secure it with the specified mounting hardware.
- Then, connect P1, P2, and P3 according to the approved wiring diagram.
- Before connecting TB1, verify the permitted voltage, current, and circuit function.
- Also, route signal cables away from high-current conductors where practical.
- Follow the system grounding plan when connecting cable shields.
- Keep the ventilation openings clear to allow heat to escape.
- Finally, inspect the wiring and connector seating before commissioning. Check the LED states against the GE manual.
- Do not remove or replace the module under power unless the approved GE procedure allows it.
