The Yokogawa V8123SE (CMZ-700B) Gyro Inverter PCB is a critical Printed Circuit Board (PCB) that serves as the inverter assembly within the Yokogawa CMZ-700B Gyrocompass system.
It is responsible for converting the ship’s DC power (typically 24VDC) into the precise AC power required to spin and maintain the delicate, high-speed rotor (gyro sphere) of the gyrocompass. This precise power supply is crucial for the gyrocompass to accurately detect true north and provide stable heading information for ship navigation.
Technical Specification
Key Function:
- Converts DC input power to the precise AC power required to drive the gyro sphere (rotor) of the gyrocompass.
Input Power:
- Voltage: Primarily 24 VDC.
- The CMZ-700B gyrocompass generally operates on a 24V DC power supply (with a range of 20V to 30V DC). The inverter PCB would draw its power from this source.
- (Optional AC adapter MKR027 allows for 100V/110V/115V/230V AC input to the main gyrocompass unit, which would then supply 24VDC to the inverter).
- Current Consumption:
- Startup: Higher current during the initial spin-up of the gyro sphere. For the CMZ-700B, the overall system consumption at startup is approximately 3.2A (DC). The inverter would be a significant portion of this.
- Regular Operation: Lower current once the gyro sphere reaches its operating speed. For the CMZ-700B, regular operation is around 1.9A (DC).
Output Power (to Gyro Sphere):
- Voltage: Typically high-frequency AC, often around 100V AC.
- Frequency: High frequency, commonly 333 Hz, to achieve the necessary high rotational speed for the gyro sphere.
- Phase Current: Monitored by the system for fault detection. Error codes (e.g., 010 for Gyro-sphere failure, 020/021 for Inverter failure) are triggered by abnormal current levels (e.g., more than 0.35A for extended periods or less than 0.05A without output voltage).
Compatibility:
- Specifically designed for the Yokogawa CMZ-700B Gyrocompass system.
Certifications and Compliance (as part of CMZ-700B system):
- IMO Resolution A.424(XI): Applicable regulation for gyrocompasses.
- MED Type Approved (“Wheel Mark”): Complies with the Marine Equipment Directive, signifying suitability for use on board ships.
- IEC 60945: General requirements for marine navigation and radiocommunication equipment.
- JIS-F9602 Class A: Japanese Industrial Standard.
Environmental Conditions (as per CMZ-700B master compass):
- Operating Temperature: -10°C to +55°C (5°F to 131°F)
- Permissible Roll/Pitch Angle: ±40°
- Vibration Resistance: Designed for typical marine vibration profiles (e.g., specific limits for 0-8.3Hz, 8.3-25Hz, 25-50Hz as per IEC 60945).
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