DS200SSBAG1 | GE Mark V Safety Shutdown Board

Description

Product Core Brief

• Model: DS200SSBAG1
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Safety shutdown board for turbine trip
• Product Type: Safety Shutdown Board (4 relay outputs, 8 inputs)
• Key Specs: 4 x 10 A safety relays | 8 x 24 V inputs | 2 x overspeed inputs | Redundant
• Condition: New Surplus.

Product Introduction

The DS200SSBAG1 is a safety shutdown board for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It provides hardwired, redundant safety trip logic independent of the main CPU.

This board monitors critical turbine parameters: overspeed (magnetic pickup sensors), emergency stop pushbuttons, and process trips (high vibration, high temperature). When a trip condition occurs, the board directly de-energizes the turbine trip solenoids via redundant 10 A safety relays—even if the main CPU has failed. The SSBAG1 meets SIL 2 requirements when used in a safety instrumented function. It is mandatory for any Mark V turbine control system.

Key Technical Specifications

Key Selling Points & Differentiators

• Independent safety trip logic – Hardwired, not dependent on CPU. Turbine trips even if CPU fails.
• 4 x 10 A safety relays (redundant pairs) – Two relays per trip channel (1oo2 architecture). A single welded contact will not prevent tripping.
• 2 x magnetic pickup inputs – Direct connection to overspeed probes. Adjustable threshold (10–50 VAC).
• 8 x 24 VDC discrete inputs – Connect emergency stop pushbuttons, vibration trips, temperature trips.
• Configurable trip logic – AND/OR per channel via jumpers. No software required.
• LED diagnostics – Visual indication of input states, relay states, and channel health.
• SIL 2 capable – Suitable for safety instrumented functions up to SIL 2 (IEC 61508).
• QC includes 1000 trip cycle test – Each relay cycled 1000 times under load.
• 2-year warranty

Frequently Asked Questions (FAQ)

Q: How does the SSBAG1 differ from software-based trips in the main CPU?
A: Software trips require the CPU to be functioning. The SSBAG1 is hardwired and independent. If the CPU crashes or loses power, the SSBAG1 still trips the turbine. Use both: software trips for normal operation, SSBAG1 as the final backup.

Q: What is the 1oo2 relay architecture?
A: Two relays in series for each trip channel (Trip A: Relay 1 AND Relay 2). To trip, both relays must open. If one relay welds closed, the other can still open and trip the turbine. Single fault does not prevent tripping.

Q: How do I set the MPU threshold?
A: Adjust potentiometer on board with included tool. Connect signal generator to MPU input. Set generator to 30 VAC at 300 Hz (typical overspeed frequency). Adjust pot until LED just turns on, then increase slightly. Repeat for second MPU input.

Q: Can the SSBAG1 be used without the main CPU?
A: Yes—the board operates independently. It requires 24 VDC power (from external supply or backplane) and trip inputs (contacts or MPU). The relays will trip based on hardwired logic alone.

Q: What is the response time from input to relay trip?
A: <20 ms typical. Input debounce (configurable) adds 5–10 ms. Total <30 ms.

Q: What QC tests are specific to the SSBAG1?
A: Nine tests:

1. Discrete input threshold: <5 V OFF, >15 V ON
2. MPU input: 10–50 VAC adjustable threshold, 20 Hz–10 kHz
3. Trip logic verification: all jumper configurations
4. Relay operate test: 1000 cycles at 5 A resistive, 30 VDC
5. Redundancy test: force relay 1 closed, verify relay 2 still trips
6. Isolation: inputs to backplane at 3000 VAC
7. LED test: all indicators
8. Temperature: −30°C to +65°C
9. Burn-in: 72 hours at +65°C, continuous relay cycling

Q: What shipping protection?
A: Anti-static bag, ESD foam cradle, double-wall box. Each board ships individually. Safety manual included. Configuration jumpers included. MPU adjustment tool included.

1756-A13 13
1756-A17 17
1756-A4 4
1756-N2