UG:110
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Applications Engineering: 800 927.9474
Page 5
Configuring and Reconfiguring MegaPACs
Most ConverterPACs of the same length can be easily added, replaced, or moved by
sliding the assemblies in or out of a MegaPAC chassis. (Currently, the exceptions
are the FinPACs which can only be used in the PFC MegaPAC-High Power and the
UniPACs which can only be used in the 4 kW MegaPAC). They are driver ConverterPACs
and can be inserted into any available slot. For outputs greater than 200 Watts, a
driver ConverterPAC and one or more booster ConverterPACs will be used. Arrays of
drivers and boosters should be configured so all boosters are placed in the slots to the
immediate right of the driver when looking at the output end of the MegaPAC.
Prior to removing or installing ConverterPACs, you must remove power from the
MegaPAC and wait five minutes. Failure to do so can result in personal injury or
damage to the supply.
Take standard ESD precautions when handling ConverterPACs.
Removing ConverterPACs
ConverterPACs can be removed by loosening the captive screw at the base. Once
this screw has been loosened, the ConverterPAC will slide out of the chassis. Once a
ConverterPAC has been removed, the empty slot MUST be filled with either another
ConverterPAC or an airblock. If the slot is left empty, it will provide an airflow escape
and cause failure to the power supply.
Installing ConverterPACs as Drivers
ConverterPACs can be installed in empty slots by simply sliding in the new
ConverterPAC and securing the screw at the base. Power and interface connections can
be made after the ConverterPAC has been installed.
Installing Booster ConverterPACs to Increase Output Power
ConverterPACs can be paralleled for more power. Additional power to an output is
obtained by connecting one or more Boosters in parallel with a single Driver. The
Driver can be placed in any open slot. All Boosters should be inserted in the slots to
the immediate right of the driver when viewed from the output end of the MegaPAC.
Figure 2 shows a driver placed in slots # 1 and 3 boosters placed in slots # 2 to 4. After
inserting the Driver and Boosters, they are paralleled using bus bars across the positive
and negative output studs. Drivers should not be paralleled with each other. Bus bars
between a Driver and Booster(s) should never be disconnected. (For help in identifying
Boosters and Drivers, refer to the Part Numbering section on Page 8). Please note that
total output voltage should not exceed the converter baseplate-output isolation rating of
400 V. For detailed guideline on how outputs should be placed in series, please refer to
the Applications Note (Creating High Voltage Outputs) available on the website
at
.
Figure 2.
Paralleling ConverterPACs
Driver
Bus Bars for Paralleling
Loosen screw to
remove ConverterPAC
Boosters
1
2
3
4
5
