SERVICE
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MAGNET POWER SUPPLY SYSTEM 8500
4.2.11. Polarity reversal.
An output line driven from ISO22 and Q9 for a polarity reversal switch is provided on P8 pin 3&4.
This output line (open collector) will deliver a pulse of a ½ second duration controlled by the SW.
The polarity operation can be HW-suppressed by pulling ST19 low.
A polarity sequence controlled by the SW is as follows:
- The DAC is first set to zero, - When the current is zero, will the Main Power be switched OFF, -
The switch motor is activated to reverse the polarity, - When the switch is in the new correct
position, will the DAC be set back to its original value and the Main Power will be switched ON, -
The output current will increase until it reaches the previous numerical value. (If the Main Power
is OFF the above sequence is initiated but the Main Power will not be switched ON.)
It is also possible to use this line as an auxiliary output port controlled through the N2 and the F2
commands. To do so, must the PO command be replaced with the N2 and the F2 commands. This
can only be done by Danfysik service personnel {SW setups}.
4.2.12. Setting up the board parameters:
Setting up the board is done by two dip switches SW1 and SW2 together with the push button S2
(SETUP), or through SW commands. Please refer to the “ESC” commands in the SW appendix
chapter for further information.
The two dip switches are configured as a multi function port, that will be validated by the CPU upon
pressing the button S2.
The four leavers on SW2 instruct what parameters to set up, and the eight leavers on SW1 delivers
the actual parameters for this set up. The parameters are first acknowledged after pressing the
SETUP switch S2.
Leaving all leavers in the OFF position will disable the SETUP switch, and thereby any unforeseen
set up modification (parking position).
If the one of the set up modes are selected, will the yellow LED to the left of the switch “LD18" lit
up indicating, that set up port is activated. The eight green LED’s to the left of SW1 will show the
present parameter of selected mode. Changing SW1 has no effect, first after pressing S2 will the
green LED’s take the same indication as SW1.
Please see chapter 3.3 for further information on all setup parameters.
Reverting all set ups to the factory default can be accomplished as follows.
Short circuit ST60 (just below SW2). Press at the same time S2 continuously. All green
parameter LED’s will start flashing. After the fifth flash will the default parameter be restored.
Please note that all parameters will be restored also any selected addresses, AD scaling factors
and also the ON pulse with. The last one may cause the power supply not being able to be
turned ON.
DANFYSIK A/S - DK 2630 TAASTRUP - DENMARK.
DOC NO P80303Sk