Siemens Servo Screen 390, Руководство по обслуживанию, Страница: 13 / 49

Servo Screen 390
E382 E394E 061 01 02 02 13
Siemens-Elema AB
2. Description of functions
2
Adapter board
General
The functional blocks on the A
DAPTER
B
OARD
PC 1663 are:
• V
OLTAGE
D
ISTRIBUTION
• S
IGNAL
A
DAPTION
• B
RIGHTNESS
C
ONTROL
• F
AN
C
ONTROL
• B
OARD
I
DENTITY
Further functional blocks connected to the
A
DAPTER
B
OARD
are:
• I
NTERNAL
P
OWER
C
ABLE
• O
N
/O
FF
S
WITCH
• D
ISPLAY
C
ONNECTION
C
ABLES
• F
AN
The A
DAPTER
B
OARD
is connected directly to
the C
OMPUTER
B
OARD
via N5.
Voltage distribution
The inlet power is fused at F1 (3.15 A fast).
Replacing the fuse is described in chapter 4,
“Service procedures”.
The different voltage levels used in the
Servo Screen 390 are regulated by and
distributed from this block.
The distributed voltage levels are:
1. +12 V (±5%), max. 2.6 A. An overvoltage
protection cuts the voltage distribution at
typ. 14.6 V.
2. +5 V (±3%), max. 3.0 A. An overvoltage
protection cuts the voltage distribution at
typ. 6.2 V.
Signal adaption
The control signals from the C
OMPUTER
B
OARD
PC 1662/PC 1835 to the display are adapted
in this block and furthered to the main block
D
ISPLAY
via P20.
Brightness control
The brightness in the display can be selected
using the S
YSTEM
M
ENU
in the application
software. The selected brightness is then
controlled via this block and furthered to the
main block D
ISPLAY
via P19.
When exchanging PC 1663, a setting of the
brightness level may be required, refer to
chapter "3. Disassembly and assembly",
section "Assembling the computer section".
Fan control
An NTC-resistor on PC 1663 senses the air
temperature inside the Servo Screen 390.
If the air temperature inside the unit exceeds
approx. 53°C (127°F), the fan is switched on.
When the temperature drops below approx.
45°C (113°F), the fan is switched off.
Board identity
PC 1663 is equipped with a B
OARD
I
DENTITY
function that makes it possible for the
C
OMPUTER
B
OARD
PC 1662/PC 1835 to
recognize the PC 1663 version. This function
is intended for possible future versions, e.g.
new types of displays.
Internal power cable
The internal power cable connects the
PC 1663 (P18) with the power inlet port
PWR (P21).