UG:107
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. They are driver ConverterPACs and can be inserted into
any available slot. For outputs greater than 200W, a driver ConverterPAC and one or more booster
ConverterPACs will be used. For outputs greater than 500W (in the 4kW MegaPAC), a driver UniPAC™
and one or more booster UniPACs 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 of the same
length 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. Torque the retaining screw to 0.23N.m (2lb.in); do not overtighten. 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, as viewed from the
output end of the MegaPAC. Figure 2 shows a driver placed in slot #1 and three boosters placed in slots
#2 – 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 10. Please note that total output voltage should not exceed the converter
baseplate-output isolation rating of 400V. For a detailed guideline on how outputs should be placed in
series, please refer to:
AN:204 Creating High-Voltge Outputs
Driver
Bus Bars for Paralleling
Loosen screw to
remove ConverterPAC
Boosters: Slots 2, 3, 4
1
2
3
4
5
6
7
8
L1 L2 L3
9
10
Figure 2
Paralleling ConverterPACs
