230 Power Management Unit Fault Finding TB8100 Service Manual
© Tait Electronics Limited September 2006
13.8 DC Module
Important When removing plug-in cards, we strongly recommend
that you use the TB8100 card remover
1
, as shown in
Figure 15.1 on page 263. A flat-blade screwdriver may
reach too far through the slot and damage the components
or tracks on the card.
For an explanation of how the operation of the PMU is controlled by fixed
hardware limits and user-programmable software limits, refer to “PMU
Operation on DC Input” on page 237.
13.8.1 DC Converter without Microprocessor Control
These checks will verify the correct operation of the:
■ DC converter without microprocessor control
■ battery control card
■ DC control card.
When testing the DC converter, you will need a variable voltage DC power
supply which can provide the correct input voltage for the DC converter
under test. The current capability of this power supply will decide how
much load you can connect to the converter. Testing at light loads will be
enough to verify if the various modules are working. A variable power
supply with a 3A capability would be sufficient.
In this section voltages are given first for a 12V PMU, followed by voltages
in brackets for a 24V PMU ( ) and a 48V PMU [ ].
Task 1 —
Check DC Converter
Power Stage
1. Remove the covers and end panels, then disconnect the DC module
from the AC module, as described in “Power Management Unit Dis-
assembly and Reassembly” on page 249.
2. Check the DC module boards and cards for any visible signs of
damage.
3. Ensure that the DC control card and battery control card are plugged
into the DC converter board, as shown in Figure 13.5 on page 231.
4. Connect the correct DC supply to the input of the DC converter and
switch the converter on.
Note The supply voltage must be higher than 12.2VDC (24.5VDC)
[49VDC] for the DC converter to start.
1. The card remover is included in the TBA0ST2 tool kit, which is available
from your nearest Tait Dealer or Customer Service Organisation. It is also
available separately as part number 220-02034-01.
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