Mecp To Secp Data Connections; Connections; Cn5 + Cn6 Power Supply To Board; Fusing - Halma Ampac EV3000 Installation & Commissioning

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
CN3 - +
CN3 - -
CN3 - Shield
CN4 -
CN4 - -
CN4 - Shield
NOTE: The polarity of the communication cable must be maintained.
Factory Connections
CN1
CN2

10.9 CN5 + CN6 Power Supply to Board

10.9.1 Fusing

Fuse
F1
F2
F3
CN6 CN5
+5
U16
+8
U3
CN1
TO
CN13
MAF
TO
CN14
CN2
Note: Comms cable must be screened twisted 2 pair.
Use
COMMS Cable IN
COMMS Cable IN
SHIELD
+COMMS Cable OUT
COMMS Cable OUT
SHIELD
Use
Internal COMMS Bus
Internal COMMS Bus
Use
8V DC Input
Control Voltage
Control Voltage
U4
U1
Q4
U8
Q3
F1
TX1
U13
U9
U5
U2
Q5
U10
Figure 22: 302-4580 Serial Isolation Board
Out: CN13 ( MAF 302 – 4220 )
In: CN14 ( MAF 302 – 4220 )
Rating
1 A (T) Pico
500 mA (T) Pico
500 mA (T) Pico
882046 22130
U7
D10 D12
900202
U11
Q1
F3
U12
Q2
302-4580
EARTH
MAN1813-9
CN3
COMMS OUT +
COMMS OUT -
SHIELD
F2
U14
U15
CN4
COMMS IN +
COMMS IN -
SHIELD
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