System Overview: Tokyo Keiki TG-6000 Gyrocompass
The Tokyo Keiki TG-6000 (Tokimec) is a widely deployed, high-reliability commercial marine gyrocompass serving global merchant fleets. Positioned between the legendary TG-5000 and the modern TG-8000/8100 series, the TG-6000 introduced advanced solid-state microprocessor control, digital latitude error compensation, and high-speed follow-up tracking while retaining the proven, robust liquid-suspended sensitive element design.
The TG-6000 provides dual serial NMEA 0183 ($HEHDT, $HEROT) heading outputs in addition to standard 6-step-per-degree repeater signals, ensuring seamless integration with RADAR/ARPA, ECDIS, and adaptive autopilots.
Technical Specifications: TG-6000
| Parameter | Specification Details |
|---|---|
| System Designation | Tokyo Keiki TG-6000 Commercial Marine Gyrocompass |
| Sensitive Element | Electrolyte-suspended sealed twin-rotor gyrosphere |
| Settle Time | Approx. 3 hours (accelerated settling within 1.5 hours via preset heading) |
| Static Accuracy | ≤ ±0.25° secant latitude (IMO A.424(XI) compliant) |
| Dynamic Accuracy | ≤ ±0.7° secant latitude under rolling/pitching up to ±30° |
| Follow-Up Speed | Up to 40°/second continuous follow-up rate |
| Output Interfaces | 2x RS-422 NMEA 0183, 3x Step outputs (24V DC), 1x Synchro output, Alarm contacts |
| Input Voltage | 100–115 V AC / 200–230 V AC (50/60 Hz) with 24 V DC emergency backup switchover |
| Power Consumption | Approx. 100 VA running (180 VA peak during rotor spin-up) |
Core PCBs, Sensitive Element & Spares
| Component | Part Number | Technical Details |
|---|---|---|
| Sensitive Element | TG6000-SE-01 | Factory-balanced sensitive element (overhaul recommended every 3 years) |
| Supporting / Damping Fluid | TG6000-FLUID-KIT | Standard electrolyte and damping fluid set (1000ml bottle) |
| Rotor Inverter PCB (INVC) | 10169501 / TG6-INVC | Inverter board generating 3-phase AC voltage to drive gyro rotor |
| Main Control PCB (MCC) | 10169505 / TG6-MCC | CPU board executing latitude error correction and system monitoring |
| Follow-Up Amplifier PCB (FUP) | 10169509 / TG6-FUP | Servo amplifier controlling phantom ring follow-up motor |
| Power Supply PCB (PSC) | 10169515 / TG6-PSC | Regulated DC supply board with automatic battery changeover relay |
| Azimuth Step Motor Assembly | 10169520 / TG6-MTR | Precision follow-up stepper motor with reduction gearing |
| Brushes & Slip Ring Set | TG6-BRUSH-SET | Replacement carbon contact brushes and slip ring maintenance kit |
| Overhaul Gasket Kit | TG6-GSK-KIT | Fluorocarbon container seals, O-rings, and thermal washers |
Seanav Maintenance & Overhaul Standards
Seanav Marine provides 24/7 port service for the Tokyo Keiki TG-6000 across major international bunkering hubs:
- Container Inspection & Cleaning: Draining old electrolyte, checking inner electrode condition, ultrasonic cleaning of the contact assembly, and re-filling with certified fresh fluid.
- Rotor Spin-Down Bench Test: Verifying bearing health by timing free spin-down duration; replacing worn bearings with ABEC-7 instrument bearings.
- Servo Follow-Up Nulling: Optical pick-off alignment and servo loop dampening calibration to eliminate hunting and oscillation.
- NMEA Protocol Validation: Testing serial RS-422 signal amplitude and sentence integrity ($HEHDT at 4800 / 38400 baud) into bridge navigation equipment.
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