Hy-Pro 0-4.5 Litre per minute Constant Running Pump

0-4.5 Litre per Minute, 440W , available in 12 / 24 vDC

Manufactured specifically for marine autopilot steering applications the versatile PC constant running power units use a heavy-duty fan cooled motor coupled to optional pump sizes to deliver up to 4.5 L/min. Designed to be used for heavy duty applications on diesel powered vessels or commercial craft these units come fitted with pressure compensated flow controls, relief valve and cylinder check valves as standard.

Description

Once the hard-over time has been set via the speed control, the steering action is achieved by switching a damped heavy duty double acting solenoid valve. The motor and precision gear pump are protected by a pre-set relief valve, and check valves with toughened components positively lock the steering on course. A stainless steel clamp retains the stove enameled steel oil reservoir, and inside is a large capacity replaceable 15 micron return line filter to maintain system cleanliness. A heavy duty motor starting relay is also supplied, as are the rubber noise absorbing mounts.

Application

Designed and developed specifically for marine autopilot applications in the commercial boat market the PC can be used with single or twin ram systems. The design of the unit also makes it compatible with unbalanced rams and pressurized reservoir type systems.

Features

• Heavy duty fan cooled motor
• 12V/24V DC options.
• Low power consumption.
• Flow output options
• Integral speed control
• Integral relief valve
• Quiet operation.
• Compact construction.
• Replaceable brushes.
• Service kits.
• Easy installation.
• Cylinder and hose kits supplied to suit.
• Industrial Spec. Motor Relay included.
• EMC protection

Technical Data
 
Voltage: 12V/24V DC                                      
Pump output: Refer order codes.
Ambient operating temp: -15 to +55 deg C

Motor voltage nominal                  12V DC               24V DC
Motor output watts                       405W                  440W
Max continuous current                24A                     12.5A
 
Ingress protection IP44 (Suitable only for ‘under-deck’, dry environment mounting.)
EMC protection BS EN 60945:2002 (DC) Line mounted
Relief valve setting: 58 bar
Orientation Solenoid A Pump to A port
Solenoid B Pump to B port
Coils 12V/24V DC 31W
Coil connection DIN 43650 (6-8mm cable)
Relay Coil 12V/24V 12W
Relay Rating 80A
Fluid ISO VG10 to VG40 hydraulic mineral fluid to ISO 6743-4 HV
Reservoir capacity 4 litres
Reservoir max pressure 3.5 bar max
Weight   12 kg

Autopilot Selection Guide:

It is important to select the correct size of pump as it directly influences the ability of the autopilot to steer the vessel. If the pump is too large, the vessel may over steer and will use more power; if it is is too small then the autopilot may struggle to maintain a course.

“Hard Over Time” is the time that the pump takes to drive the rudder from port to starboard. An autopilot drive preferably gives a “Hard over time” of 10 to 14 seconds unless otherwise specified by the autopilot manufacturer. The type of vessel to be steered must be considered as the “Hard over time” may be faster on lightweight planing craft / modern yachts and slower on displacement power boats/ long keel yachts.

To use the table in our product pictures, you will need to know the volume of your steering cylinder, then select the "Hard over time" that you require. Follow the column down until you approximately match your cylinder volume and then select the pump on that row. If your cylinder has a smaller volume then it will have a faster “Hard Over Time”, but if it is larger, it will have a slower “ Hard Over Time”.

In the Box

0-4.5 Litre per Minute 24v DC Constant Running Pump, with solenoids.