Mechanical speed governing systems are prone to wear and hence setpoint drift. This can result in spurious overspeed trip operation or even failure to trip during a genuine overspeed condition. The drift of the operating setpoint also requires constant operator intervention. The TC41-FPG offers a low-cost solution for a speed governor control system for steam driven boiler feed pumps.
The TC41-FPG can interface with an existing hydraulic actuator or it can be supplied with a hydraulic actuator to replace a mechanical speed governing system. The TC41-FPG comes pre-programmed with the following functions:
- Turbine Speed Control
- Rate of acceleration detection
- Run-up ramp control
- Remote speed setpoint e.g. boiler follow mode
- Steam stop valve ramp open/close and trip close
- Alarm and trip initiation
Options for:
- On-load valve test, for multi-steam path
- Ovespeed trip detection
- Stress run-up control
Hardware Features
- High quality PCC CPU processor
- 700 kB SRAM, 4 MB Flash ROM
- 0.4 micro second instruction time (typical)
- LED status indicators
- 24V DC operation max 20 W
- Operating temperature 0-50°C. Storage -20 to +60°C
- 3U (132mm) high 19" rack sub assembly, 162mm deep
I/0 Capability:
- 10 x 24V DC sinking logic inputs
- 8 x 24V DC sourcing outputs
- 1 x clean contact output (used for trip contact) 0.5 A max
- RS232 and CAN bus interface ports
- 6 input modules for:
- 4 x frequency/speed inputs
- 4 x 4-20 mA signals
- 4 x thermocouple input with cold junction compensation built in
- 4 x Analogue output
- 4 x RTD inputs
- Additional logic I/O
- RVDT, LVDT and valve actuator drives. Options for all signals e.g. 4 - 20mA, 0 - 200mA etc.
Operator Interface
Backlit 6" LCD touch screen display to enable the operator to make quick and informed decisions on the status of the gas turbine.
- Logic I/O Status
- Bar graph and Digital display of analogue values
- Alarm and trip alphanumeric message, time and date stamped
- Trend plot to view analogues
- Commissioning Modes to ease fault finding and set up
- Allow forcing of outputs and adjustment of control parameters (Gains, setpoints etc.)