DS200STCAG1A | GE Mark V Speed Controller Board

Description

Product Core Brief

• Model: DS200STCAG1A
• Brand: General Electric (GE)
• Series: Mark V DS200
• Core Function: Turbine speed controller with governor
• Product Type: Speed Controller Board (1 channel)
• Key Specs: 2 x MPU | 4–20 mA reference | ±10 V output | PID governor | Overspeed trip
• Condition: New Original.

Product Introduction

The DS200STCAG1A is a turbine speed controller board for GE’s Mark V DS200 series, used in Speedtronic turbine control systems. It implements the primary governor function: compares actual turbine speed (from magnetic pickups) to speed reference, calculates valve position demand via PID, and outputs a ±10 VDC signal to the servo valve.

The STCAG1A is a dedicated speed control board, separate from the main CPU. It provides faster response (<1 ms update) and independent overspeed protection. Features: dual magnetic pickup inputs (redundant speed sensing), 4–20 mA speed reference from operator setpoint, PID governor with droop adjustment, and a hardware overspeed trip output. Use it for gas turbine and steam turbine speed control.

Key Technical Specifications

Key Selling Points & Differentiators

• Dedicated speed controller – Independent from main CPU. Faster response (1 ms vs 10 ms).
• Dual magnetic pickup inputs – Redundant speed sensing. Switch on failure.
• Hardware overspeed trip – Direct relay output. No CPU or software delay.
• PID governor with droop – Standard speed droop for parallel operation. Adjustable 0–10%.
• 1 ms PID update rate – Fast enough for gas turbine speed control.
• ±0.05% speed accuracy – Precise speed measurement for grid synchronization.
• Built-in speed simulator – Test with internal speed generator. No external signal source needed.
• QC includes overspeed trip test – Verified at 110% setpoint, response <20 ms.
• 2-year warranty

Frequently Asked Questions (FAQ)

Q: What is the difference between the main CPU (SBC) and STCAG1A (speed controller)?

Q: Do I need both the STCAG1A and the main CPU?
A: Yes for most applications. STCAG1A handles speed control loop (fast). Main CPU handles sequencing, temperature control, I/O, and communication.

Q: How does droop work?
A: Droop reduces speed setpoint as load increases. Allows parallel operation of multiple turbines. Example: 4% droop means 100% load requires 4% speed reduction.

Q: What is the overspeed trip setpoint range?
A: 105% to 120% of rated speed. Adjustable via software. Default 110%. The hardware trip is independent of CPU.

Q: Can the STCAG1A operate without the main CPU?
A: Yes—standalone speed control. Connect speed reference (4–20 mA) and MPU inputs. The board will control the servo valve independently.

Q: What QC tests are specific to the STCAG1A?
A: Ten tests:

1. Speed measurement: 10 Hz–12 kHz, accuracy ±0.05%
2. PID update rate: 1 ms verified
3. Overspeed trip: setpoint accuracy ±0.1%, response <20 ms
4. Droop adjustment: 0–10% verification
5. Output: ±10 VDC, 16-bit resolution
6. Speed reference input: 4–20 mA accuracy
7. Speed display output: 4–20 mA
8. Isolation: 2500 VAC
9. Temperature: −40°C to +70°C
10. Burn-in: 72 hours at +65°C

Q: What shipping protection?
A: Anti-static bag, ESD foam cradle, hard plastic clamshell case. Configuration software on USB drive. Programming cable included. MPU test tool included. Speed simulator (optional) available. Each board ships individually. Contact us for speed control application engineering support.

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