Specifications

FWMurphy – AS731 / AS732 installation section A: panel installation and wiring mi6128 revision G 10
th
Sept 2007 p3/6
General
Electrical connection is at the rear of each unit, through a
pair of two-part type screw terminal blocks labelled 1 - 20
and 21 - 30. Use a 3mm (1/8”) flat head screwdriver to
loosen and tighten each screw terminal: to avoid excessive
rotational force on the circuit boards, Murphy recommend
that each connector block is removed from the unit before
loosening or tightening individual screw terminals.
Murphy make the following general connection
recommendations:-
Battery chargers
Some battery chargers feature
significant ripple and switching
noise on the DC output. This
electrical interference can be
imposed on the panel power
supply and control lines, with
the potential to cause faulty
operation of (and in extreme
cases damage to) electronic
control equipment.
charger
battery
+
A
utostart
Control panel
other
controls
Minimise the effects of charger
output noise by using separate
wiring 1) between charger
output and battery terminals
(or starter motor star point) and
2) between battery terminals
and panel DC supply rail.
charger
battery
+
A
utostart
Control panel
other
controls
External Slave Relays are a
recommended connection on
all outputs (as shown right),
either to achieve the required
load switching capability, or
to reduce wear and tear on
internal relay contacts.
Slave relay and solenoid coils
will naturally emit voltage
spikes when de-energising,
with the potential to cause faulty
operation of, or damage to,
electronic equipment.
Suppress relay and solenoid
coils at source, using the
manufacturer’s recommended
suppression network. DC coiled
relays may also be suppressed
using a reversed biased
flywheel diode as shown right.
Positive outputs
A
utostart
RL1
+
+
Negative outputs:-
A
utostart
RL1
+
AC cabling &
wiring harnesses
Separation of AC and DC
wiring/harnesses is strongly
recommended, in particular
where AC circuits feature
inductive/switched loads
or high frequency noise, or
where cable lengths above
5 metres are used.
AutostartAutostart
PANEL MOUNTING
1.
140
92
A
(mm)
2.
B
D
C
FRONT
150 30
(typ)
3.
FRONT
Each unit is mounted in the front of a
control panel through a DIN standard
cut-out, 140 mm wide by 92 mm high.
With the mounting clamps removed,
insert the module through the front of the
panel cut-out (A). The case extends to
150mm behind the panel front. An extra
30mm should typically be allowed for the
connection of the wiring harness.
Working behind the panel front, fit the two
mounting clamps to studs on the side of
the case. Locate each clamp on to the
front stud (B), compress the clamp by
pressing on the screw (C) and push the
clamp upwards to locate on to the rear
stud (D).
With both clamps fitted, tighten the
screwed pins (E) so that they move
forward and secure the unit to the rear
of the panel facia (F). The case design
allows a panel thickness of up to 8mm.
ELECTRICAL CONNECTION
DANGER !
HIGH VOLTS
WARNING: DANGER OF INJURY OR DEATH. During normal operation, the AS731/AS732
is connected to high voltage AC circuits. Before connection, disconnection or handling
of these units, ensure that all AC and DC power supplies are isolated.
Connection to
or disconnection from live wiring may also cause damage to AS731/AS732 internal components.
Product Discontinued