SERVICE
38
MAGNET POWER SUPPLY SYSTEM 8500
4.2.8.
Motherboard:
The control board contains the control and monitoring circuits for the MPS. In addition it is used as
motherboard for the following modules:
DCCT module, Regulation module, CAMAC module (Option) and the Isolation module for external
monitoring of the output current and voltages (0
6
10V) (Option)
Sheet 1 of the circuit diagram shows’the interconnection wiring between the different module, as
well as the supply voltages to the different boards. Some of the supply voltages are galvanically
isolated from each other in order to prevent ground loops.
The voltage regulators are IC31, IC33, IC35, IC37, IC29 and IC1 shown in sheet 7.
If the DCCT electronics requires a different voltage as the given ±8V unregulated supply for the
compensation current, an external supply can be provided to plug P34. If so, please remember to
disconnect this new supply from the rest of the module by removing ST23 and ST24.
4.2.9.
Water Flow measurement:
A Water flow sensor giving pulses proportional to the flow rate can be attached to P21.
The water flow sensor must have a TTL compatible output signal, Totem Pole or open collector. Pin
1 and 3 of P21 can be used as 5V supply voltage for the sensor.
IC3 on sheet 3 acts as a level detector adjustable with Pot1. JX4 enables the circuit to pass the water
flow interlock to the interlock chain. This interlock is then Or’ed with the external interlock from
P5 pin 5&6.
The flow pulses are also connected to the FPGA, that converts the frequency to a pseudo analog
signal aviable on logical AD channel 13.
The flow circuit is calibrated for a flow sensor giving 752 pulses pr. liter pr. minutes.
As all the AD channels can be rerouted and re scaled, is it possible to replace the water flow
information on the M-Panel instead of the TESLA reading.
4.2.10. LED indications on the board:
Most of the status signals indicated on the remote lines can also be read from light-emitting diodes.
Most of these LED's are software controlled and they are therefore only valid if the
ì
P works.
On the over next page is a list of these LED's with their description:
DANFYSIK A/S - DK 2630 TAASTRUP - DENMARK.
DOC NO P80303Sk