MPH690
Yokogawa MPH690 — Annunciator unit for PT900 autopilot system status and alarm indication.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Check if heading indication on AP CDU matches steering repeater and alternative heading input sources (if available) once per week. Verify 3-axis heading sensor ports (IEC61162-1/2) are properly connected and synchronized.
Tap the touch panel periodically and verify correct response to user inputs. Ensure display clarity and no visual defects. Test all autopilot modes (AUTO, HAND, NFU, CRS) for proper control signal transmission.
Verify RL8 relay on MAN TERMINAL baseplate is energized once when selecting NO.1 or NO.2 at system selector. Test once every six months. Check for audible clicks and proper relay engagement.
Inspect all terminal connections for looseness, corrosion, and oxidation. Retighten fixing screws if loose. Check cable routing for damage, chafing, and proper strain relief. Verify backup 24V DC power supply continuity once every six months.
Verify rudder angle feedback signal is received and displayed correctly on AP CDU. Test rudder command output to steering actuator (solenoid valve or torque motor) for proper response. Check for MCU (Adaptive) timeouts. Ensure rudder angle matches command within 0.5 degrees.
Type-general inspection and maintenance points for this equipment category — not model-specific.
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