MAN1813-9
36
10.8
MECP To SECP Data Connections
The 302-4580 is the serial loop interface RS-485 connection board which provides communication via
a redundant loop from the MECP to the SECP's.
10.8.1
Connections
Field Connections
Use
CN3 - +
COMMS Cable IN
CN3 - -
COMMS Cable IN
CN3 - Shield
SHIELD
CN4 -
+COMMS Cable OUT
CN4 - -
COMMS Cable OUT
CN4 - Shield
SHIELD
NOTE:
The polarity of the communication cable must be maintained.
Factory Connections
Use
CN1
Internal COMMS Bus
Out: CN13 ( MAF 302
–
4220 )
CN2
Internal COMMS Bus
In: CN14 ( MAF 302
–
4220 )
10.9
CN5 + CN6 Power Supply to Board
10.9.1
Fusing
Fuse
Use
Rating
F1
8V DC Input
1 A (T) Pico
F2
Control Voltage
500 mA (T) Pico
F3
Control Voltage
500 mA (T) Pico
EARTH
900202
882046 22130
302-4580
SHIELD
S
H
IE
L
D
-
+
S
H
IE
L
D
-
+
COMMS OUT +
COMMS OUT -
COMMS IN +
COMMS IN -
SHIELD
F2
F3
D12
D10
Q3
U16
F1
+8
CN2
CN1
U3
U5
U2
U1
U4
Q2
U10
U9
U12
CN4
CN6
CN5
CN3
U11
U7
U8
Q1
TX1
U14
U15
U13
+
Q4
Q5
+5
T O
CN13
TO
CN14
MAF
Figure 22: 302-4580 Serial Isolation Board
Note: Comms cable must be screened twisted 2 pair.
Summary of Contents for Ampac EV3000
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