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ADJUSTMENT
ATTENTION: WHEN THE CIRCUIT IS POWERED ON, A LOT OF POINTS CARRY
DANGEROUS MAINS VOLTAGE.
As the clock of the controller must continue working during a power failure, we opted for an
oscillator based clock built round a crystal and a devider. The disadvantage of this system
versus a 50Hz mains time base is that it has to be adjusted. If you don't adjust the clock, it
may go wrong after a certain period of time. Adjusting can be done in two different ways:
1) Using a frequency counter:
Connect the counter to the points GND(earth) and TP. The frequency measured must be
of 256KHz i.e. a period of 3.90625mS. The time base can be adjusted using trimming
capacitor CV1.
2) at sight:
Of course the first method is the best one but as only few of us possess a frequency
counter, the second method will be the most frequently used one. Turn the trimming
capacitor CV1 to its centre position (the fixed and movable plates must overlap by about
half their surfaces). Should in course of time the clock go wrong, then you would have to
readjust the trimming capacitor CV1 a little. To that end the front panel contains a hole
through which the clock can be adjusted.
FIXING THE FRONT PANEL
M3 BOLT
8mm THREAD TUBE
5mm THREAD TUBE
M3 BEVELLED HEAD BOLT
Fit each of the six sunk holes with an 8mm and 10mm spacer using an M3 bevelled head
bolt.
ATTENTION: Fix these screws WELL because, with the foil sticked, they will no longer be
accessible.
Before sticking the self-adhesive foil to the aluminium front pate, check that the surface
contains no wire-edges, dirt or other obstacles.
Position the foil onto the front panel (pay attention to the LED windows OUT1, ...).
Provisionally adhere one half of the foil using adhesive tape. Remove the protective sheet
from the other half and stick this side, then remove the adhesive tape and the protective
sheet from the first half and stick this half to the aluminium front plate too.
Fit the basic module onto the thread tubes using six M3 bolts and check that the indication
LED's and LCD display are well positioned, also check the operation of the push buttons.
The controller is now ready for use.
P6000B
SOLDERSIDE
ALU FRONT PANEL
9
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