SERVICE
32
MAGNET POWER SUPPLY SYSTEM 8500
4.
Theory of operation.
Following chapter describes the features of the Control module more in detail.
4.2.
Control Board
Schematic:
83853 1/7 to 7/7
Assy:
P-83852
The task of the Control Board module is to control and supervise the different functions within the
power supply. Turning the power supply ON and OFF, communication with the “Front panel”
module, external serial link or a parallel CAMAC module for user interface, monitoring different
analog signals and setting of the output current value (DAC control). A micro processor takes care
of the above mentioned functions.
To do so it also acts as a motherboard link for other modules.
The Control Board can be divided in following functions:
-
ì
-Processor.
- Real time Clock
- Serial Communication. RS232/RS422
- Parallel Communication. CAMAC
- Interlock control.
- DAC control. Current setting and ramp profile interpolation
- ADC control. Analog measurements.
- Setting up the board parameters.
- Ramp profile HW interpolation and synchronization.
- Water Flow measurement
- Motherboard .
4.2.1.
ì
-Processor:
The
ì
-processor is the intelligent part of the control module. It consists of the
ì
-processor IC16 and
the memory circuit’s, IC8, IC14 and IC15 in the page 5. IC10, IC11, IC12 and IC17 are buffers and
select chips for the other circuits. To expand the I/O capabilities of the
ì
-processor an FPGA IC20
is added.
The
ì
-Processor is of the type Hitachi H8 with built in A/D channels, serial interface and some I/O
bits.
The CPU runs at 14 MHz, controlled from the crystal Y2.
IC12 is a “Reset”, "Watchdog" circuit that will reset the CPU, if it for some reason stops to refresh
the watchdog every second. At the same time will the LED D3 flash once.
IC10 and IC15 are coupled as address decoders for attached I/O Chips.
The CPU can be reset with switch S1.
DANFYSIK A/S - DK 2630 TAASTRUP - DENMARK.
DOC NO P80303Sk