mjm yachts 50z Downeast, Owner'S Manual

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CHAPTER 10
Please see the operating manuals provided with your 50z both in hard copy and CD. A list of
which is on the following page.
10.1 SEAKEEPER 9 GYROSTABILIZER
GENERAL
The Seakeeper Gyro is a 900 lb sphere that spins at up to 9000 RPM to create a near-immovable force. It
is anchored to a reinforced structure over the bottom of the boat to withstand the torque applied to the hull
by waves, thus dramatically reducing the boat’s tendency to roll. The Seakeeper must be run from the
Generator or the 50 AMP 240V AC Shorepower.
START SEAKEEPER
Before starting the Seakeeper, be sure to check the raw water strainter under the ladder to the utility room
to be sure that the cooling water intake to the Gyro is not blocked.
With the 240V AC Panel activated by either the Generator or Shorepower 1: Turn ON the GYRO Breaker.
Then to activate the Seakeeper Control Panel on the Dash, turn ON the GYRO on the 12V DC Panel.
Then PUSH the lefthandmost button of the Seakeeper control box on the helm console so the button
symbol turns from red to green. The bar then indicates progress of the gyro spooling up. It takes about 35
minutes to reach the point where the 2
nd
buttom from the left can be pushed to activate the gyro,
ACTIVATE SEAKEEPER
Seakeeper is activated, once the status bar has disappeared by pushing the 2
nd
button from the left. You
will then see the lock symbol unlock and the gyro start to swivel on the control panel screen.
DE-ACTIVATE
When underway, you can DEACTIVE the Seakeeper by pushing this button again and you will see the
Gyro image stop rotating. You can go back and forth between “GYRO ON” and “GYRO OFF” by
continuing to push this 2
nd
button … it takes maybe 10-15 seconds to respond to either action.
TURNING OFF
Push the lefthandmost button on the Seakeeper control panel. It’s a good idea to do this as early as
possible on the way into port to give the unit at least a half hour and preferrably more to spool down. The
power to the Seakeeper should remain ON at the panels below, The reason is that it is important to allow
the 240v cooling pump to keep on functioning to cool the bearings when at higher RPMs.
CHECK SEAKEEPER STATUS
CAUTION Be sure to check the raw water strainer for the Seakeeper for blockage before/after each use
to be sure it’s clear, otherwise the temperatures for the bearings could rise high enough to cause damage.
To check for the temperature of bearings and the RPM, the procedure is as follows:
With the Seakeeper Control Panel ON, push the 5
th
button (Gears) – then the 4
th
button (tools) then the 4
th
button (right arrow) again. Fill in the Code 4442 when prompted, then hit button 5 (left arrow). Keep hitting
button 4 (right arrow) to display: RPM, Upper & Lower Bearing Temp and Drive Temp. Hit button 5 (left
arrow) to return.
SYSTEMS & EQUIPMENT