Operator`s manual

Rev. 1/99 Vicor 800-735-6200 Westcor Division 408-522-5280 Applications Engineering 978-749-3524 or -3525 Pg. 9
3 Phase MegaPAC Owner’s Manual
Configuring and Reconfiguring MegaPACs
ConverterPACs can be easily added, replaced, or moved by sliding the assemblies in or out of a MegaPAC chassis.
Most ConverterPACs are driver ModuPACs and can be inserted into any available slot. For outputs greater than
200 watts, a driver ModuPAC and one or more booster ModuPACs 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 5
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, significantly degrade thermal performance, and can cause failure.
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 ModuPACs or QPACs to Increase Output Power
ModuPACs and QPACs can be paralleled for more power. Additional power to an output is obtained by connect-
ing 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 9 shows a driver placed in slot #1 and 3 boosters placed in slot #s 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. For help in identifying boosters and drivers, refer to the section on MegaPAC Part
Numbers.
Interface Connections
Chassis Input Power Terminals (J1)
Input AC power is applied to a plug-in connector, J1, that accepts soldered terminals with a maximum wire size of
10 AWG. For operation on high voltage DC input, input power can be connected to any two input lines. A fault-
clearing device should be installed at the input of the unit. A user-accessible input fuse is not present within the
unit. For an output of 2000W with operation on 208 Vac, 3∅ input, a 20A slow-blow fuse in each input line is
acceptable. Input power cables should be shielded to minimize radiated noise effects.
Driver
Bus Bars for Paralleling
Loosen screw to
remove ConverterPAC
Boosters: Slots 2, 3, 4
12
3
4
5
6
7
8
L1 L2 L3
9
10
Figure 9. Paralleling ModuPACs