1.2.3 HYDRAULIC DRIVE UNIT
The hydraulic drive unit consists of a precision
_
gIsar
pump with integral valve block driven by a
continuously rated servo motor. A special
pi’essure balance valve corrects the effects of
h!/draulic
slip and isolates the pump from the
steering circuit when the autopilot is not
energised. The pump drive motor is connected
directly to the course computer which also
regulates peak pump pressure and eliminates the
need for end stroke limit switches.
I
I
'A
117mm
(46")
Supply voltage
Regulated peak pressure
Flow control
Peak flow rate (unloaded)
Maximum ram capacity
Power consumption
(typical average)
O~~erall
length ‘A’
Type
1
12
volts (24 volts optional)
450lb.in’
(30bar)
integral pilot check and
pressure balance valve
system
40in3/mm
(650cc/min)
1 5in3
(2.50~~)
2-3.5 amps
95in. (240mm)
Type
2
12 volts (24 volts optional)
450lb.in.*
(30 bar)
integral pilot check and
pressure balance valve system
80in3/min
(1300cc/min)
30in3
(5OOcc)
4-8 amps
10.5in.
(265mm)
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