8
Mechanical design
The annunciator unit is composed of the fol-
lowing Euro-size withdrawable modules (100 x
160 mm):
- a power supply module SWSM 220A48 or
SWSM 220A220
- four microprocessor modules SWPM 1A1B
- four input/output modules SWIM 2A1B
FAULT
ON
PROGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
FAULT
ON
PROGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
FAULT
ON
PROGRAM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TEST
RESET
ACK
SILENCE
FAULT
ON
PROGRAM
2
3
4
6
7
8
10
11
12
14
15
16
1
5
9
13
SACO 16D2
SACO 16D2
SACO 16D2
SACO 16D2
SWPM 1A1
SWIM 2A1
SWSM 220- SWDM 3A1
Fig 4. Mechanical design of SACO 64D4.
The modules are interconnected on the mother
PC-board. The mother PC-board also contains
the card connectors for the plug-in modules and
the wiring for the inputs and outputs.
The rack housing the modules is a 19 inch, so
called Euro-rack with a height of 3 U (about
133 mm).
When mounting several SACO
64D4 subracks
together or combining them with other
SPACOM subracks, a space of 1 U, i.e. about
44 mm, should be left between the subracks.
The subrack is suitable for mounting in a 19
inch frame or it may be flushmounted. At flush
mounting the depth behind the mounting sur-
face can be reduced by 40 mm by using a rais-
ing frame, type SRH-ZX1.
The subrack is made of anodized aluminium.
The rear panel and the ventilation grids are made
of galvanized sheet steel. The front panels are of
aluminium and covered by a plastic membrane.
At panel mounting the degree of protection by
enclosure will be IP 40.