SERVICE
36
MAGNET POWER SUPPLY SYSTEM 8500
For further information on the Soft Ware controlled ramp profile features, please see the chapter “3.3
Operating by RS232or RS422 I/O”
4.2.7.
Analog measurements:
Different voltages are monitored by means of Analog to Digital converters, as internal supply
voltages and DAC-BOX delta temperatures and as well external values as output load currents and
voltages.
The following analog signals are monitored:
LOGICAL
PHYSICAL
BIT
CHANNEL CHANNEL
VALUE
RESOLUTION
0
IC34/CH0
Output current
11 + sign
1
IC34/CH3
Tesla (+1V)
11 + sign
2
IC34/CH2
Output Voltage
11 + sign
3
IC16/CH1
In15V sup.
10
4
IC16/CH2
IInternal -15V sup.
10
5
IC16/CH3
In5V sup.
10
6
IC34/CH1
Delta temperature
11 + sign
7
IC34/CH5
Trans. Bank Vce
11 + sign
8
Piggy Board/CH0
Optional Iout (16 Bit)
16 + sign
9
Mirror of logical channel 0
10
Mirror of logical channel 8
11
IC34/CH6
Iout Optional
11 + sign
12
IC34/CH4
Vout Optional
11 + sign
13
FPGA
Water flow
16
14
IC34/CH7
Free on plug P29 (±1V)
11 + sign
15
IC16/CH0
Free on plug P19 (10V)
10
The ADC block can be seen no sheet 3 of the schematic 83853. The 10 bit converters are located
inside the CPU IC16.
The measurements are available both on the local control panel and the serial remote lines.
The reference voltage for the ADC converters comes from IC30 that delivers a voltage of 4.096V
which can be measured on TP23.
The burden resistor on the regulation board receives one Ampere for 100% output current. The
voltage of the burden resistor is measured by a high input impedance low drift differential amplifier
A1 to give an excellent measurement, especially when the optional 16 bit ADC is used.
Adjustment and calibration of the AD channels are mainly performed by changing the ADC scale
factor through SW for each channel. Only the VCE reading and the Iout Off-set value can be
trimmed through potentiometers. Please se the picture on the next page for a more detailed
visualization of the potentiometer locations and the different plugs including the user analog inputs.
The plug description later in this chapter input resolution for the different AD channels.
DANFYSIK A/S - DK 2630 TAASTRUP - DENMARK.
DOC NO P80303Sk
