Cadac F-Type User Manual
Page 99
APP-III
Revision F2005-2
F-Type
3.
Put probe on the -18V O/P cap and adjust the O/P adjuster on the -18V block
until the volt meter reads -18.00 ±0.05V.
4.
Move the probe to the +18V cap and adjust the +18V block so that the volt meter
reads +18.00V ±0.05V.
5.
Move the probe to either TP1 and TP2 (0V) on the front panel mounted control
card 8023, or to PIN 8 and PIN 3 (0V) on the 9-pin ‘D’-connector on the front
panel. Adjust the front panel mounted “offset adjust” pot to as close to 0.00V as
possible. Replace the top cover.
Fault-finding tests:
6.
Check the green LEDs (Mains OK and O/P OK on the power blocks. These
LEDs should illuminate when the ‘push to start’ button is pressed.
7.
If either of the red LEDs “over-voltage” or “current limit” are illuminated, return
the power block for replacement. NOTE: DO NOT attempt to service the blocks.
Lethal DC-voltages are exposed underneath cover.
8.
If MAINS OK LED does not come on, check the fuse. The fuse should only be
replaced with a 10A HBC TYPE T fuse.
9.
If MAINS OK LED is illuminated but O/P OK LED is not, check that the 15-way
‘D’- connector on the PSU-block is tightened. Check that the connector on the
8023 control card (on front panel) is pushed in all the way.
10. If the O/P OK LED still does not light, remove 15-way ‘d’-connector and link pins
9 and 10 on the PSU. If the PSU starts, the 8023 card or its wiring is faulty. If the
PSU is still not working, it should be returned to the factory.
11. Check that the fans are running (on back of PSU). If not, the PSU will overheat
and shut down, or will not provide full O/P capability. The fan can become stuck if
subjected to a hard knock - try to free the fan with the power turned OFF. If the
fan still does not come on, return the PSU to the factory.
12. If the PSU shuts down when connected to the console, check that each PSU-
block can deliver approximately 103A and start into 90A.
13. With the wire linking on the back of the PSU removed and the PSU disconnected
from any external loads, make sure that there is no reference to mains earth
from the ±18V rails.
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The 8020 +13v/48v unit is based on one ADVANCE F20006 ‘power-block’, with addi-
tional circuitry as shown on CADAC drawing number C3.8016.
The a.c. input is connected to the PSU via a 3-core cable, CMA reference 3183TQ –
BASEC approved, rated at 20A.
Under no circumstances, should the 8020 PSU be used without a SAFETY EARTH
connection.
Failure to follow this instruction is both a fire and safety hazard.
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You will need CADAC drawings 8016 and 8023B.
TEST EQUIPMENT: Digital volt-meter, probe (must not be referenced to mains
earth), insulated adjustment tool.
WARNING! DO NOT remove cover unless you are qualified to service the parts
underneath it. UNDER NO CIRCUMSTANCES should anyone attempt to remove the
covers of the power blocks.
1.
Place the power supply on a flat surface and remove the top cover. Connect a
load to an O/P connector that is capable of drawing a current of 40A.