I. Product Description

Produced in the United States, it is equipped with MicroNet system's analog combination I/O card. It integrates four functions: speed acquisition, analog quantity acquisition, analog output, and actuator drive. It is used in the 505/505E steam turbine / gas turbine speed control system. It collects the rotational speed, pressure, and temperature signals of the unit and outputs to drive the fuel / steam regulating valve actuator. The board has onboard terminals for wiring, and it is installed in rack slots.

Key Technical Parameters Table

Parameter Item Specification Parameters

Power Supply DC 18～32V (nominal 24VDC, reverse connection protection)

Speed Input 4 magnetic-electric speed sensors, 100～25000Hz, input amplitude 1～25Vrms, input impedance 2kΩ

Analog Input AI 8 channels, programmable 4-20mA/0～5VDC signal input

Analog Output AO 4 standard 4-20mA transmitters

Actuator Driver 2 proportional drive outputs: 4-20mA/20～160mA (direct drive electro-hydraulic actuator)

Sampling Resolution 12Bit, full-scale range accuracy ±0.03% FS (software self-calibration)

Channel Isolation Single-channel isolation withstands 500VAC, photoelectric isolation anti-interference

Single-channel Refresh 5ms full-channel scanning cycle

Operating Environment -40℃～+70℃, industrial wide temperature grade

Installation Method Embedded installation in system backplane slot

Overall Machine Weight Approximately 0.78kg

Communication Board-mounted internal system bus, connects to 505 main control CPU, optional RS485 Modbus external communication

Product Performance

Integrated Integration: One card integrates speed, AI, AO, and actuator drive, simplifies cabinet wiring, reduces the number of accessories;

High Precision Stable Control: Built-in temperature compensation in the entire temperature range, the error of transmitter and valve position signal acquisition is extremely small, the stability of speed closed-loop is high;

Channel Independent Fault Tolerance: A single channel short circuit / break does not affect the operation of other channels, the fault location is uploaded to the main control for alarm;

Signal Adaptive: AI channel software configuration can switch between 4-20mA/0-5V, compatible with various industrial pressure, temperature, and level transmitters;

Adaptation to Harsh Operating Conditions: Three-proof coated PCB, resistant to oil mist in the engine room, vibration, and electromagnetic interference, meeting the continuous and long-term operation of power stations.

Application Domains

Steam Turbine Generator Sets: Industrial waste heat steam turbines, small-scale thermal power steam turbines, self-owned power station steam turbines for speed signal acquisition and valve drive;

Gas Turbines / Gas Compressors: Gas engines in oil and gas stations, rotary compressors for speed and load closed-loop control;

Diesel Power Equipment: Large-power land-based / marine diesel generator sets for grid speed control system;

Chemical and Petrochemical Plants: Process-driven turbines, booster units for on-site instrument signal acquisition and valve control output.

MicroNet Series 5501 Model Starting Numbers Table

Model Module Type Configuration Description

5501-367 16-channel Switching Input Module Resistive contact acquisition, photoelectric isolation

5501-370 16-channel Relay Output Module Valve, alarm circuit driver

5501-376 Mixed AI / Speed / Drive Module 4-speed + 8AI + 4AO + 2 drives (main general model)

5501-380 Pure Analog Input Module 16-channel 4-20mA dedicated acquisition card

5501-385 Valve Position Servo Drive Module High-power actuator exclusive drive card