Cost-Effective Design

The 505 control is designed to function as the turbine control, system sequencer, operator control panel, and first-out indicator. This encompassing design minimizes external system devices as well as system installation, wiring, and troubleshooting.

This field-configurable controller allows major functional changes to be made on-site, often by knowledgeable plant personnel, and minor functional changes to be on-line as process changes require. The 505 control’s first-out-indicator logic indicates internal as well as external system related alarm and shutdown conditions, greatly simplifying and reducing system troubleshooting.

Communications

The 505 controls can communicate directly with plant Distributed Control Systems and/or CRT-based operator control panels, through four Ethernet ports using Modbus TCP or OPC communication protocols, or via one serial Modbus port. The single serial port supports RS-232 or RS-485 communications using ASCII or RTU Modbus protocols.

Communications between the 505 and a plant DCS can also be performed through hard-wired connections.

Control

The following PIDs are available to perform as process controllers or limiters:

• Speed/Load PID (with multiple dynamics & Adaptive PID)

• Extraction/Admission Pressure/flow PID

• Cascade PID (Header Pressure or Tie-Line Control)

• Auxiliary PID 1 (limiter or control)

• Inlet Header PID

• Exhaust Header PID

• Rotor Acceleration PID (on startup)

System Protection

• Integral Overspeed Protection Logic & Test Capability

• First-out Indication (15 individual shutdown inputs)

• External Alarm Indication (15 individual alarm inputs)

• Stuck in critical speed band logic

Control Specifications

INPUTS

Power:

• LV models = 18–36 Vdc

• HV models = 88–264 Vac & 90–150 Vdc

Speed:

• 2 Passive MPUs or 2 Active Proximity probes (0.5–35 000 Hz)

Discrete Inputs:

• 20 Configurable Contact Inputs
  (optionally 16 additional inputs via LinkNet-HT modules)

Analog Inputs:

• 8 Configurable 4–20 mA Inputs
  (optionally 16 additional 4–20 mA inputs via LinkNet-HT modules)
  (optionally 8 additional RTD inputs via LinkNet-HT modules)

OUTPUTS

Valve/Actuator Drivers:

• 2 Actuator Outputs, 4–20 mA or 20–200 mA

Discrete Outputs:

• 8 configurable Relay Outputs; contacts rated 24 Vdc @ 5 A

Analog Outputs:

• 6 Programmable 4–20 mA Current Outputs

COMMUNICATIONS

Ethernet:

• 4 ports (Modbus TCP or OPC protocols)

Serial:

• 1 Modbus port (ASCII or RTU) Comm Ports (RS-232 or RS-485 compatible)

CAN:

• 4 ports (Woodward CANopen protocol)