The Yokogawa CMZ 700 series user manual covers the operation, maintenance, and technical specifications for three primary models: CMZ700B (Basic), CMZ700S (Single), and CMZ700D (Dual).
Detailed versions of these manuals are available on platforms like Scribd, which hosts an 84-page manual including block diagrams and system configurations. Key Manual Sections & Specifications
The manual is typically organized into several chapters covering the lifecycle of the equipment:
System Overview: Detailed block diagrams for the B, S, and D models.
Operation: Procedures for starting the system, selecting modes, and inputting data like ship's speed and latitude.
Maintenance & Service: Instructions for cleaning the gyro sphere and its container, including safety precautions for mercury handling.
Command Functions: A list of 44 command codes for displaying headings, alarms, and performing alignments. Technical Specifications
According to documentation from Communication and Radionavigation SPB, the system's performance includes:
Settling Time: Meridian alignment within 5 hours (2 hours under working conditions). Accuracy: Static accuracy of approximately Environmental Limits: Operating temperature range of -10negative 10 +55∘Cpositive 55 raised to the composed with power C and a maximum pitching angle of ±40∘plus or minus 40 raised to the composed with power Power Supply: CMZ700B: 24V DC. CMZ700S/D: AC main supply (100V–230V) with 24V DC backup. Maintenance Intervals
Critical components require periodic servicing to ensure reliability:
Gyro Sphere: Replacement or overhaul every 1 to 5 years depending on usage.
Electronic Parts: Printed circuit boards typically require replacement every 6 years. yokogawa gyro compass cmz 700 user manual
For direct access to specific digital documents, you can find the CMZ700 Series Manual and the CMZ700D User Manual on Scribd. CMZ700 Series Gyrocompass Manual | PDF - Scribd
The Yokogawa CMZ700 series gyrocompass is a high-precision navigation system designed to provide reliable heading information for ships. The series includes three primary models: (Basic), (Single), and (Dual). Core Manuals and Documentation
Because the CMZ700 is a professional maritime system, the "complete guide" is typically split into several specialized manuals available through platforms like Scribd:
User Manual (CMZ700B/S/D): Covers system overview, hardware descriptions, operating instructions, and basic maintenance.
Service & Overhaul Manual: Detailed instructions for cleaning the gyrosphere and handling hazardous substances like mercury.
Maintenance Mode Guide: Lists restricted command codes (30–39) for resetting running hours and correcting installation errors. Key Specifications & Performance
Settling Time: Reaches an operational state in approximately 2 hours, with full settling within 5 hours. Accuracy: Static accuracy is within ; dynamic accuracy is within
Power Supply: Primary AC (100V–230V, 50/60Hz) with 24V DC backup support. Operating Limits: Designed for temperatures between -10∘Cnegative 10 raised to the composed with power C +55∘Cpositive 55 raised to the composed with power C Operation and Command Codes
uses a numeric command interface for various settings and displays. CMZ700 Series Gyrocompass Manual | PDF - Scribd
Title: The Silent Guide
The rain drummed a relentless, rhythmic beat against the wheelhouse windows of the MV Solstice. Outside, the North Sea was a churning mass of slate-grey water and white foam, the horizon completely obliterated by the squall. Inside, Chief Officer Elias Thorne was fighting a losing battle with the vessel's aging navigation suite. The Yokogawa CMZ 700 series user manual covers
The ship’s primary gyrocompass had been drifting for weeks. It wasn't a catastrophic failure—just a lazy, intermittent deviation of two or three degrees that gave the old man at the helm the jitters. In heavy traffic lanes, two degrees was the difference between a safe passage and a Mayday call.
Elias wiped grease from his hands and stared at the unit. It was a Yokogawa CMZ 700, a workhorse of the maritime industry. It wasn't flashy, but it was usually reliable. Today, however, the display was flickering, and the "Alarm" LED blinked a taunting amber.
"The Captain is asking if we can resume course, Chief," the helmsman said, his voice tight. "He doesn't want to rely solely on the magnetic compass in this mess."
"Tell him to hold tight," Elias grunted. He reached for the bulkhead above the desk, his fingers searching for the familiar plastic binding of the ship's technical library. He pulled out the Yokogawa Gyro Compass CMZ 700 User Manual.
It was dog-eared, stained with coffee rings from years of watch standers, and smelled faintly of diesel. Elias flipped past the safety warnings—pages 1 through 4, which he knew by heart—and skipped the table of contents. He needed the troubleshooting section. He needed the heart of the machine.
Chapter 3: Operating Procedures. Elias quickly scanned the diagrams. He knew the startup sequence: Power On -> Check for initial rotation -> Wait for the 'Ready' light. He had done it a thousand times. But the book reminded him of the nuances he had forgotten.
“Section 3.2.2: Latitude Correction.”
Elias paused. They had recently transited from the Mediterranean to the North Sea. The latitude setting on the control panel was still dialed in for 40 degrees North. They were now approaching 55 degrees North.
"Idiot," he muttered to himself. He tapped the 'Mode' button until the Latitude indicator flashed. He spun the dial, watching the digital numbers climb. 52... 53... 54... 55. He hit 'Enter'.
The display flickered, but the alarm didn't clear. The deviation remained.
"Okay," Elias whispered, flipping deeper into the manual. "Let's look at the hardware." Check 1: Power Supply Voltage
Chapter 4: Troubleshooting. The manual's text was dense, translated from Japanese to English with a clinical precision that often made it hard to parse. Elias traced the flowchart for "Heading Deviation / Instability."
He checked the speed log. It was feeding correctly.
He turned the page to Chapter 5: Maintenance and Disassembly. This was the section the shore-based technicians usually handled, but the nearest port was three days away. The diagrams were intricate cross-sections of the master compass.
The CMZ 700 was a marvel of engineering. Unlike the old, spinning-mass gyros that took hours to settle, the CMZ 700 used a "Cogent Ring Laser" or a specialized strap-down system depending on the model year. The manual detailed the sensitive suspension system.
“If heading error persists after parameter correction, inspect the Suspension Wire for physical tension or slack.”
Elias grabbed his toolkit. He moved to the master compass unit located in the chartroom alcove. Opening the heavy steel casing, he revealed the sensitive heart of the device. He pulled a flashlight from his belt.
According to the manual's exploded view diagram on page 58, the suspension wire was the lifeline that isolated the gyro from the ship’s violent
Ship 24VDC (+) ---[PSU]---+--- CMZ-700 (J1 pin1)
Ship GND (-) ---[PSU]---+--- CMZ-700 (J1 pin2)
|
+--- DBX-4 power in
CMZ-700 (J2 NMEA out) ---> NMEA devices
CMZ-700 (J3 Ethernet) ---> CDU
CMZ-700 (J4 STEP out) ---> Repeaters
The user manual provides a decision tree for common alarms:
If you are looking for the manual, you are likely troubleshooting or installing. Here is what the manual covers that operators find most useful:
Latitude & Speed Error Correction: The CMZ-700 requires manual input of the ship's speed and latitude to correct for "Steaming Error" (the apparent movement of the gyro due to Earth's rotation and the ship's motion). The manual explains how to input this data. Note: Newer CMZ-700B models can accept this data automatically via NMEA from the GPS/Log, removing the need for manual entry.
Alarm Codes: The manual provides a comprehensive list of alarm codes. Common ones include:
Maintenance: The manual outlines the replacement of the Gyro Sphere. This is a periodic maintenance item (usually every 2–3 years depending on running hours). The manual provides clear diagrams for removing the liquid, replacing the sphere, and re-filling the fluid mixture (specific gravity is crucial here).