Boiler Feed pump Control

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 when 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 FlashPROM
  • 0.4 micro second instruction time (typical)
  • LED status indicators
  • 24 Vdc operation max 20 W
  • Operating temperature 0-50 deg C. Storage -20 to +60 deg C
  • 3U (132mm) high 19" rack sub assembly, 162mm deep

I/0 Capability:

  • 10 x 24 vdc sinking logic inputs
  • 8 x 24 Vdc 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 ¼ VGA (120x90mm) graphic monochrome LCD display with keypad 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.)

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