Hydraulic Drive - Raymarine Autohelm ST7000 Installation Instructions Manual

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
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.
Supply Voltage
Regulated Peak Pressure
Flow Control Integral
Peak Flow Rate (unloaded)
Minimum Ram Capacity
Maximum Ram Capacity
Ram Type
Power Consumption
average)
Overall Length 'A'
Maximum Vessel size
Maximum Vessel Displacement
and displacement
Type 1
12 volts
50 bar (750 psi)
Pilot Check Valve Integral
I 1 00cc/min (67in
100cc (6in )
3
230cc (14in
3
Single or Double Ended
(typical 2 - 4 amps
190mm (7.5in)
13m (42ft)
118OOKg (26000lbs)
/min)
3
)
Type 2
12 volts (24V optional)
55 bar (900 psi)
Pilot Check Valve Integral
1700cc/min (103in
200cc (12in )
3
400cc (24in )
3
Single or Double Ended
4 - 8 amps
216mm (8.5in)
18m (60ft)
24OOOKg (55000lbs)
7
/min)
3