Model 8000 and Model 7000A Gyros
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TECHNICAL BULLETIN Product: MODEL 8000 GYRO Description: Technical Differences Between Model 8000 and Model 7000A Gyros Technical Differences between Model 8000 and Model 7000A Gyros Primary Objectives of Model 8000: • • • • Increase stabilization capacity. Reduce the size of the Motor Drive Box and mount it on the gyro foundation to eliminate the step of remote mounting. Simplify and reduce the time required for installation. Improve cooling system capacity and change to self-purging design with ability to easily add fluid. Gyro Specifications Property Rated Speed Angular Momentum Anti-Rolling Torque Spool-Up Time Time to Stabilization Spool-Up Power Operating Power Required Sea Water Supply Weight Dimensions Model 8000 8000 RPM 8,000 N-m-s 17,140 N-m 35 min 20 min 3000 watts 1000-2500 watts 15.1 lpm (4 gpm) 549 kg (1210 lbs) .92m (L) x .99m (W) x .71m (H) Model 7000A 9700 RPM 7,000 N-m-s 15,000 N-m 45 min 20 min 3000 watts 1500-2000 watts 8 lpm (2 gpm) 455 kg (982 lbs) .91m (L) x .99m (W) x .71m (H)

TECHNICAL BULLETIN Description: Technical Differences Between Model 8000 and Model 7000A Gyros Model 8000 Mechanical Differences • • • • • Overall length increased from 917 mm to 921 mm. Overall width and height are unchanged. Adhesive injection holes added to sides of foundation to ensure complete bonding. Added stand-off pads to saddle beams to ensure thin film of adhesive remains in top of saddles. With more components onboard gyro, tool clearances are important for serviceability! See Seakeeper Drawing 90123!!! Model 8000 Cooling Differences Stand-Off Pads Heat exchanger upgraded and...

TECHNICAL BULLETIN Description: Technical Differences Between Model 8000 and Model 7000A Gyros Model 8000 Electrical Differences (reference Drawing 90149) • • • Motor Drive Box mounted onboard gyro compared to remote mounting for M7000A. 230 VAC input to motor drive box simplified on 3m cable. 230 VAC output (from motor drive box) provided for sea water pump on 3m cable. Delay-Off Timer Box has been eliminated. Sea water pump (5 Amps max, customer-supplied) automatically started and stopped by gyro controller. Serial Comms Break-Out Box replaced by 25 m cable. Smaller connector OD is .65”...

TECHNICAL BULLETIN Description: Technical Differences Between Model 8000 and Model 7000A Gyros Model 8000 Operation Differences • If boat’s 24 VDC circuit breaker is “On” then the Gyro Control Box is “On”. There is no “poweron relay” inside the Gyro Control Box. Glycol pump and seawater pump are automatically started when RUN is depressed on keypad. Glycol pump and seawater pump are automatically stopped when STOP is depressed on keypad and speed has dropped to zero rpm. Power draw drops to 15 watts after gyro stops spinning. The gyro should be stopped when pulling into port and...

TECHNICAL BULLETIN Description: Technical Differences Between Model 8000 and Model 7000A Gyros Model 8000 Alarm Differences Alarms create a message on the Display and an output on the relay contacts. Alarms also cause gyro precession to stop (LOCK) and the flywheel to begin spooling down (STOP). • • • When an alarm occurs the display will automatically switch to the RPM page. A keypad press changes the alarm output relay to the normal state. BEARING 1 TEMP HIGH o o Set-point changed to 80°C, was 75°C Reset point changed to 55°C, was 50°C BEARING 2 TEMP HIGH o Set-point changed to 80°C, was...

TECHNICAL BULLETIN Description: Technical Differences Between Model 8000 and Model 7000A Gyros REVISION HISTORY REVISION 1 INITIAL RELEASE SEAKEEPER, INC. 44731 ST. ANDREWS CHURCH ROAD, CALIFORNIA, MARYLAND, 20619, U.S.A PHONE: 410-326-1590 E-MAIL: customerservice@seakeeper.com