Simran RPU80 Measurements and Calculations for Applying the RPU, Calculation of cylinder volume

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Simrad Reversible Pump RPU80/160/300

2 MEASUREMENTS AND CALCULATIONS FOR APPLYING THE RPU

2.1 Calculation of cylinder volume

The RPU80 is recommended for cylinders between 80-250 cm3 (4,9-15,2 cu. in.), RPU160 for cylinders between 160-550 cm3 (9,8-33,5 cu.in.) and RPU300 for cylinders between 290 -960 cm3 (17,7-58,5 cu.in.). These figures will give for a rudder angle of 70 degrees (35°-0-35°) a hardover to hardover time of 6-20 seconds equivalent to a rudder speed of 11,6-3,5 deg./second. Based on experience 6-8 deg./second seems to be the optimum speed for autopilots with proportional rudder control. However, a rudder speed between 11,6 deg./second and 3,5 deg./second should normally cause no problem, particularly not the high speed which will be reduced by the autopilot electronics.

Depending on type of autopilot the rudder speed is automatically or manually adjusted during installation and commissioning. Refer to page 1-1 and the autopilot manual for detailed information.

The cylinder volume is calculated from the formula:

Volume =

L(D2

d 2 )π

 

4

Where

 

 

 

L = stroke length

D = internal cylinder diameter (= outside diameter – 0,6) d = push rod diameter

π= 3,14

(All dimensions in centimeters)

2.2 Minimum rudder time adjustment

(Applies only for Junction units J1000B, J101A and J45A)

The minimum rudder time can be found as follows (see figure 2- 1):

Draw a horizontal line from the applicable value on the cylinder volume axis. Rudder time may now be read on the horizontal axis.

By means of potentiometer RV1 in the Junction unit the rudder time can be increased.

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20220422N

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Contents Simrad RPU80/160/300 Reversible Pump Copyright 20220422N Document revisions Contents Technical Specifications Introduction General20220422N Capilano, Flexatrol Canadian. See Seastar Harmek Norwegian RPU160 RPU300 BCS ItalianBosvik Norwegian HC HYDRO-CONTROL GermanRPU160 RPU300 Hynautic Lecomble & Schmitt FranceRPU160 RPU300 Lecomble & Schmitt Old models Seipem ItalianTeleflex See Seastar Tenfjord Norwegian RPU160 RPU300 Servi NorwegianSLEIPNER, Hydrive Norwegian Vetus DutchRPU160 RPU300 Vetus Wagner CanadianMeasurements and Calculations for Applying the RPU Calculation of cylinder volumeMinimum rudder time adjustment Capacity nomogram for Reversible Pump RPU80/RPU160/RPU300 Description of RPU80/RPU160/RPU300 ConstructionPrinciple of operation ref. -1 and figure Pressure operated non-return check valves on outlet a and B Valve blockGear pump Suction valves on outlet CPipe connections Installation Mechanical InstallationInstallation of pipes Connection to expansion tank Connection to hand hydraulic steering gear Electrical installation J3000X, J300X, J300X-40, J50, J50-40 AC10, AC20, AC40Oil filling and bleeding Preparation and TestingTesting Electric motor MaintenanceDismantling Piston rod does not move with rudder commands Fault TracingPump motor is not running/not responding to rudder command Excessive noise from the pump unitSteering wheel is turning while pump unit is operated Piston rod of the rudder cylinder does not move smoothlySmall and sudden heading changes while on automatic steering Rudder moves only in one direction with pump running Activator reduces the hardening time to 1 hourTechnical Specifications SpecificationsDimensions RPU80 performance RPU160 performance RPU300 performancePos Qty Gear pump parts Spare PartsRPU80/RPU160/RPU300 Motor parts Lemac Parts for Fracmo motorsRPU80 Previous model gear pump Pos Qty Gear pump parts Previous RPU80 modelSales and Service Worldwide Europe