7
1.2.3 Hydraulic Drive Units
Two reversing hydraulic drive units are available
depending on the size of the vessel and the
displacement of the ram.
The vessel size and displacement
recommendations given below apply to directly
driven steering systems. When a power steering
system is fitted the vessel size and displacement
recommendations can be ignored.
Type 1 and Type 2
The hydraulic drive unit consists of a precision
gear pump with integral check valve block driven
by a continuously rated servo motor. The pump
drive motor is connected directly to the course
computer which also regulates peak pump
pressure.
Type 1 Type 2
Supply Voltage 12 volts 12 volts (24V optional)
Regulated Peak Pressure 50 bar (750 psi) 55 bar (900 psi)
Flow Control Integral Pilot Check Valve Integral Pilot Check Valve Integral
Peak Flow Rate (unloaded) I 1 00cc/min (67in
3
/min) 1700cc/min (103in
3
/min)
Minimum Ram Capacity 100cc (6in
3
) 200cc (12in
3
)
Maximum Ram Capacity 230cc (14in
3
) 400cc (24in
3
)
Ram Type Single or Double Ended Single or Double Ended
Power Consumption (typical
average)
2 - 4 amps 4 - 8 amps
Overall Length 'A' 190mm (7.5in) 216mm (8.5in)
Maximum Vessel size 13m (42ft) 18m (60ft)
Maximum Vessel Displacement 118OOKg (26000lbs) 24OOOKg (55000lbs)
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