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Dual Power Supplies
To adjust a system with two power supplies
Note
Power supply adjustment must be performed on one power supply
at a time, with the other power supply disconnected from its power
source.
1. Disconnect AC power from one power supply.
2. Monitor the +5V
DC
potentiometer until the test point reads 5.18V
Caution!
!
Note
If the +5V
supply setup and the measured voltage is inside the normal range,
this indicates there is imbalanced sharing. Increase the voltage on
the supply with the lit LED.
3. Monitor the +12V
potentiometer until the test point reads 13.5V
4. Connect power to the disconnected supply and remove power from the adjusted
supply.
5. Repeat
Step 2
for the second power supply.
6. Both power supplies should now be adjusted. Reconnect power to the disconnected
supply.
Low Voltage
If one or more cards in the common control equipment card cage has the red FAIL LED
light turned on, the power supply level should be checked. The Fail LED is tied to a low
voltage reset circuit that monitors the +5V
+ 5V
power supply at the test point on the front of the power supply with all cards
DC
installed in the card cage. Adjust the +5V
procedure.
Overvoltage
When using older power supplies, adjusting the potentiometer too high will put the 5V
supply into overvoltage protection (no output voltage). If this happens, turn the ADJ
potentiometer down and cycle the AC power. The 5V
supplies do not have this feature and cannot be adjusted beyond 5.3000V
test point of the powered supply and turn the ADJ
The adjustment direction of the +5V
depending on the version. Newer units require a counter-
clockwise rotation to increase voltage.
Fault LED is lit on a single power supply in a dual
DC
test point of the powered supply and turn the ADJ
DC
supply to the card. Measure the output of the
DC
power supply according to the previous
DC
Model 4048 CCE Set Up
.
DC
potentiometer varies
DC
.
DC
supply will reset. Newer power
DC
.
DC
DC
35
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