PT500 autopilot system is designed to maintain a ship’s heading under automation while commanding its steering gear. It consists of a follow-up mechanism as a pilot system and can act with various actuators such as solenoid valves and torque motors and does so in line with various types of steering gear. The system is applicable to general merchant ships. The PT500 also has a Batch Noise Adaptive Autopilot Controller (BNAAC) that maximizes the use of rudder and fuel consumption by automatically adjusting the ship’s disturbance model and rudder control gain. This improves rudder controllability and enhances fuel efficiency.

Batch Noise Adaptive Autopilot Controller (BNAAC) designed for fuel-efficient navigation
Automatically updates the ship’s disturbance model
Automatically sets rudder control gain optimally based on real-time ship model
Improves rudder controllability by detecting disturbances
Enables easy settlement of the ship’s basic model
Achieves fuel savings by reducing rudder activity and enhancing ship speed

Technical Specification

1. Electrical & Power Specifications

Parameter	Specification
Main Power Supply	AC 100V / 110V / 115V / 220V $\pm 10\%$ , 1-phase, 50/60 Hz
Backup / System Power	DC 24V (+30%, -10%) (Automatic switchover on AC failure)
Power Consumption	Approx. 100 VA to 200 VA (varies by steering output drive configuration)
Enclosure Protection	IP22 (Main Steering Stand / Console Unit)

2. Sensor Inputs & Interfaces

Interface	Signal Type / Format
Gyrocompass Inputs	Dual Heading Inputs: Digital Serial (`CMZ-700`, `CMZ-900`), Synchro, or Step
Magnetic / GNSS Input	NMEA 0183 (`$HEHDT`, `$HCHDT`, `$THS`) via RS-422 (IEC 61162-1)
Speed Input	NMEA 0183 (`$VHW`, `$VTG`, `$VBW`) or 200 pulses/NM Speed Log
ECDIS / Route Tracking	NMEA 0183 (`$APB`, `$XTE`, `$BWC`) via IEC 61162-1 for Track Control
Rudder Feedback	Heavy-duty Dual Potentiometer / Synchro Unit mounted at steering gear

3. Control Performance & Operational Modes

Feature	Performance & Specifications
Steering Control Modes	AUTO (Automatic Heading), TRACK (ECDIS Route Steering), HAND (FU Wheel), NFU (Non-Follow Up Tiller)
Control Algorithms	• Standard Digital PID Control • BIONIC Adaptive Control (Optimizes rudder activity to sea state and load)
Heading Accuracy	Holds heading within $\pm 0.5^\circ$ (in calm-to-moderate sea conditions)
Display & Monitoring	Integrated multi-function digital display with analog turn-rate / rudder angle meters
Alarm & Safety System	Off-course alarm, Sensor discrepancy fail, Power fail, Steering fail, System self-diagnostics

4. Steering Gear Interfaces & Output Codes

Model Variant	Steering Interface Type	Output Signal / Control Type
PT-500A	Adaptive Steering Control	Solid state / relay outputs to proportional valves or solenoids
PT-500D	Digital Steering Control	Standard solenoid valve / proportional drive outputs
PT-500S	Modular Console Integration	Interface panels designed for flush-mount IBS bridge consoles

5. Type Approvals & Standards

IMO Compliance: IMO Res. A.342(IX), MSC.64(67) Annex 3, ISO 11674, IEC 62065 (TCS Category B), IEC 60945
Certifications: ClassNK, MED (Wheelmark), JG (Japan Government), ABS, DNV-GL
Country of Origin: Japan

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