4.1 Power Failures and Alarms Introduction

The Motor Drive Box contains hazardous voltage and the cover should not be removed while the flywheel is spinning and the AC input voltage is present. This high voltage exists even if the flywheel is coasting down and the supply voltage has been shut off. The flywheel must be at 0 RPM and AC input power disconnected for at least 10 minutes prior to any service work on the motor drive box.

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The operator should physically examine the Seakeeper following an alarm. Continuing to reset alarms without service intervention can result in damage or personnel injury.

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There are three sources of power to the Seakeeper 40:

• 24 VDC powers the Seakeeper for all the electronic controls.
• 24 VDC powers the DC Seawater Pump for cooling water supply.
• 208 – 230 VAC powers the Motor Drive Box to drive the motor inside the Seakeeper.

These power sources are supplied on cables shown on Drawing No. 90710 – Seakeeper 40 Cable Block Diagram.