Service manual

28 Siemens-Elema AB E382 E380E 061 01 03 01
Description of functions Servo Ventilator 300/300A
2
2.3 Inputs
Analog multiplexor for input signals to the
block 2.1 PANEL CPU.
2.4 LED matrix
Time multiplexed addressing and driving
stages for the block 2.5 LED ARRAY. The input
data is given from the block 2.1 PANEL CPU.
2.5 LED array
This block contains the light emitting diodes
of the front panel bargraphs and the yellow
light emitting diodes at the front panel
settings.
Some flashing function in front panel
bargraphs are mentioned in 4.1 MONITOR/
ALARM CPU
2.6 Panel display
This block contains all the green alpha-
numerical four character light emitting diode
displays on the front panel. The input data is
given from the block 2.1 PANEL CPU.
2.7 Mode select
Input stage for the signals from the front
panel Mode selector. The input is available
as four bit code and corresponding four bit
complementary code generated via the
small interconnecting circuit board PC 1632
on the Mode selector. This block gives the
data to the block 2.1 PANEL CPU.
2 Panel interface
This main block consists of the board
PC 1614 PANEL INTERFACE including its
PC1588 MICROPROCESSOR MODULE . The board
is connected (via N18, N19 and N40) to the
mother board (PC 1617) CONTROL INTERCONNEC-
TION and it has connectors (P81 – P99) for
the connection of FRONT PANEL controls.
The FRONT PANEL touch sensors as well as
displays and indicator LEDs are integrated
parts of this board. Refer to 1 FRONT PANEL in
this chapter.
A connector, N20 (on some older PC-boards,
the connector is marked N80), is provided
on the board for additional function. This
connector can be used to connect the
optional PC 1745 AUTOMODE PANEL INTERFACE
used in SV 300A. This function is described
in section 2A AUTOMODE PANEL INTERFACE that
can be found after 2.9 MONITOR DISPLAY.
.
2.1 Panel CPU including PAN-
PROM functions
This block includes the board PC 1588 with
a PAN-PROM. Some details of the PC 1588 are
mentioned in section Microprocessor
module PC 1588 in this chapter.
The PAN-PROM function includes the handling
of input signals from the main block 1 FRONT
PANEL
, calculation of some displayed values
and handling of signals to the displays on
the main block 1 FRONT PANEL.
2.2 Parameter buffers
Input stage for potentiometers on the main
block 1 FRONT PANEL.