Dc Module; Dc Converter Without Microprocessor Control - Tait TB8100 Service Manual

13.8

DC Module

13.8.1

DC Converter without Microprocessor Control

Task 1 —
Check DC Converter
Power Stage
230 Power Management Unit Fault Finding
Important
When removing plug-in cards, we strongly recommend
that you use the TB8100 card remover
Figure 15.1 on page
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
Operation on DC Input" on page
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 [ ].
1. Remove the covers and end panels, then disconnect the DC module
from the AC module, as described in
assembly and Reassembly" on page
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
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.
1
, as shown in
263. A flat-blade screwdriver may
237.
"Power Management Unit Dis-
249.
Figure 13.5 on page
© Tait Electronics Limited September 2006
"PMU
231.
TB8100 Service Manual