Simrad AP20 Autopilot
60
20220505H
PREVIOUS MODELS DRIVE UNITS
Model Motor
voltage
Junction
unit
Drive output Interface to
steering gear
RPU100,
RPU150,
(Reversible
hydraulic
pump)
12V J300X
Proportional
rate
Hydraulic
plumbing
MRD100
(Reversible
mechanical
drive)
12V
24V
J300X
12V to clutch
24V to clutch
Proportional
rate to motor
Chain/
sprockets
MRD150 12V
32V
J300X
12V to clutch
32V to clutch
Proportional
rate to motor
Chain/
sprocket
Note !
When selecting
DRIVE UNIT
voltage in the Installation setup,
the clutch/bypass voltage is always set equal to the motor
voltage. If a retrofit installation where e.g. a HLD2000 has a
12V motor and a 24V bypass valve, the bypass valve solenoid
has to be changed back to standard 12V version.
Connecting a reversible pump
Simrad
reversible
pump
JUNCTION UNIT
POWER PCB
TB1 TB2 TB3 TB4 TB5
TB6
S
ol.
-
M
ot
or
S
ol.
-
M
ot
or
Figure 4-5 Connecting a reversible pump