4.2 Power Failures

12 VDC Low Current

If the +12 VDC control power is disconnected during operation, the display will be blank, flywheel speed will decrease, and the brake will be locked (no precession).

• Verify the boat’s circuit breaker supplying +12 VDC control power has not tripped and the AC breaker is On.
• When +12 VDC control power is restored, the display will power up, the Splash Screen will appear, and then the Home Screen will appear.
• Press Power On/Off button . The progress bar will appear and indicate flywheel speed. When the flywheel is at minimum operating speed, the Stabilize button will appear so stabilization can be turned on. This may take up to 30 minutes, depending on the speed of the flywheel when the +12 VDC is turned back on.

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Seawater Pump Power

If Seawater Pump input DC power is disconnected during operation, the Seawater Pump will fail to provide cooling seawater flow when required. The resulting high temperatures would result in the Seakeeper being turned off (no stabilization) due to high temperature alarm(s).

• Verify the boat’s circuit breaker or fuse supplying DC Seawater Pump power has not tripped or blown.
• When DC SW Pump power is restored, reset any alarm and continue Seakeeper operation.

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AC Power Failure

If the AC power is disconnected during operation, a notification screen will indicate “AC Mains Low”. If the failure is not corrected within two minutes, an “AC Mains Low” alarm will occur. The brake will lock and the Seakeeper will stop moving if stabilization was on.

• Verify the boat’s circuit breaker supplying 110-230 VAC to the Motor Drive Box has not tripped.
• When 110-230 VAC is restored, the display will power up, the Splash Screen will appear, and then the Home Screen will appear.
• Press Power On/Off button . The progress bar will appear and indicate flywheel speed. When the flywheel is at minimum operating speed, the Stabilize button will appear so stabilization can be turned on. This may take up to 30 minutes, depending on the speed of the flywheel when the 110-230 VAC is turned back on.

AC Power Fluctuation, Spike, or Momentary Failure

If the AC voltage to the Motor Drive Box is outside Seakeeper’s specified range (110 – 230 VAC), the Motor Drive Box will briefly shut down for protection. The Motor Drive Box will continue operation when the voltage returns to the specified range.

A brief fluctuation can happen when the generator is unable to regulate its output voltage, particularly when a large AC load is switched on or off. A momentary AC failure also happens during transition from shore power to ship’s power.