Specifications

FWMurphy – AS731 / AS732 installation section A: panel installation and wiring mi6128 revision G 10
th
Sept 2007 p5/6
19
20
Magnetic pickup positive
Magnetic pickup negative
These terminals allow engine speed to be measured
using a magnetic pickup. Pickup positive and negative
output terminals should be respectively connected
to pins 19 and 20. (Note: where the pickup head is
isolated from the pickup body and ground, polarity
of connection is not usually important.)
The connection between pickup and Autostart should
use a twisted pair and shield cable, with the shield
connected to ground at one end only.
The number of engine flywheel teeth must be
programmed into the unit before it will correctly
measure and display engine speed.
Terminal block 21 - 30
21
22
23
24
Generator volts L1
Generator volts L2
Generator volts L3
Generator Neutral
WARNING: HIGH VOLTAGE -
DANGER OF INJURY OR DEATH.
• Ensure that all AC power supplies are
isolated before connection, disconnection
or handling.
• Use fully shrouded wiring connectors on
these terminals.
These terminals are used to sense the generator AC
voltage and frequency, required for functions such as
the automatic crank release, load switching and
voltage/frequency/speed tripping.
Voltages are measured between each phase and the
neutral terminal (maximum rating 300 VAC). The unit
can however be programmed to display AC voltages
as either phase to neutral or phase to phase. Voltages
are displayed on the LCD, left to right, L1, L2, L3.
The AS731/AS732 can also be programmed for use
with 2 phase and neutral systems (leave pin 23 open
circuit) and single phase systems (leave pins 22 ad 23
open circuit).
A 1 Amp anti-surge fuse should be connected in series
with each phase input (pins 21, 22 and 23).
25
26
27
28
29
30
CT L1
CT L1 return
CT L2
CT L2 return
CT L3
CT L3 return
These inputs are used to measure 3 phase generator
current. Each input pair is designed for direct
connection to a current transformer (CT) with a 5 Amp
rated secondary coil. Where CTs are connected at a
common star point, the star point should be
commoned with pins 26, 28 and 30.
The CT primary coil ratio must be programmed into
the Autostart before the unit will correctly measure and
display AC current. A number of other programmable
options allow the setting of generator over current
warning and/or trip levels.
ELECTRICAL CONNECTION (cont.)
Typical wiring diagram (AS731 automatic mains fail generator)
RPO2
magnetic
pickup
fuse
+ve DC
WL
A
+
–
RPO3
RPO4
Emerg.
Stop
5A
1 2 3 4 5 6
L1
L1
L1
L1
L2
L2
L2
G
E
N
E
R
A
T
O
R
L2
L3
L3
L3
L3
MCR
MCR1
LOAD
generator
contactor
mains
contactor
GCR1
1A
1A
1A
GCR
MCCB
N
N
N
N
M
A
I
N
S
UVR500
Autostart
731
–
ve DC
21
22
23
24
25
26
27
28
29
30
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
fuel
RFL
RSTstarter
LOP
HET
IP3
IP4
IP5
inputs
Product Discontinued