Operator`s manual

Rev. 1/99 Vicor 800-735-6200 Westcor Division 408-522-5280 Applications Engineering 978-749-3524 or -3525 Pg. 7
3 Phase MegaPAC Owner’s Manual
ConverterPAC Functional Description
ConverterPACs are the family of slide-in output assemblies used in MegaPAC power supplies.
ConverterPACs are interchangeable within a MegaPAC so they can be added, moved, or changed
as necessary. They are also interchangeable between different AC input MegaPAC chassis. A
ConverterPAC removed from a Mini MegaPAC could be used in a 4kW MegaPAC, for example.
ConverterPACs can be selected with a variety of options and in voltages from 2 to 95 Vdc.
ModuPAC
The ModuPAC output assembly consists of a VI-200 DC to DC converter that converts the unreg-
ulated high voltage bus to the desired regulated output voltage. Each ModuPAC can provide up to
200 watts of power. Multiple ModuPACs can be paralleled in a driver-booster configuration to pro-
vide more power. ModuPACs are fused with a PC-Tron, DC-rated, fast-acting fuse. A passive LC
filter is used to reduce output ripple/noise down to 1% typical, and 2% maximum peak-to-peak
from 10% to 100% of rated load. An optional DC Power Good signal, or output voltage Trim poten-
tiometer can be specified. The ModuPAC contains overvoltage protection (OVP), overcurrent pro-
tection (OCP), and overtemperature protection (OTP). The OCP has automatic recovery when the
overcurrent condition is removed. The OVP and OTP are latching functions and require recycling
of the AC input power to restart.
UniPAC
The UniPAC output assembly consists of a VI-900 module that converts the unregulated high volt-
age bus to the desired regulated output voltage. UniPACs can provide up to 400W of power.
Multiple UniPACs can be paralleled together for higher power. UniPACs are fused with a PC-Tron,
DC-rated, fast acting fuse. The output from a UniPAC comes directly from the VI-900 module and
has no output filtering. A DC Power Good LED is standard and an optional DC Power Good sig-
nal is available. Local Sense and Trim options are also available. If the Trim option is not select-
ed, the output voltage can be trimmed using an external circuit and the Trim pin available on the
Sense connector. UniPACs have OCP, which automatically recovers when the overcurrent condi-
tion is removed. OVP and OTP are latching functions that require the AC power to be recycled.
DualPAC
This output assembly consists of two VI-J00 DC to DC converters that convert the unregulated high
voltage bus to the desired regulated output voltages. Each output on a DualPAC can provide up to
100 watts of power and are fused with a single PC-Tron, DC-rated, fast-acting fuse. A passive LC
filter is used to reduce output ripple/noise down to 1% typical, and 2% maximum peak-to-peak
from 10% to 100% of rated load. An optional output voltage Trim potentiometer can be specified.
DC Power Good signal is not available. The DualPAC contains overcurrent protection, which
recovers automatically when the overcurrent condition is removed. Overvoltage and overtem-
perature protection are not available.
JuniorPAC
The JuniorPAC consists of one VI-J00 DC to DC converter that converts the unregulated high volt-
age bus to the desired regulated output voltage. JuniorPACs can provide up to 100 watts of output
power and are fused with a single PC-Tron, DC-rated, fast-acting fuse. A passive LC filter is used
to reduce output ripple/noise down to 1% typical, and 2% maximum peak-to-peak from 10% to
100% of rated load. An optional DC Power Good signal, or output voltage Trim potentiometer can
be specified. The JuniorPAC contains output overcurrent protection, which recovers automatically
when the overcurrent condition is removed. Overvoltage and overtemperature protection are not
available.
RAMPAC
This output assembly consists of a VI-J00 DC to DC converter with a Ripple Attenuator Module
(RAM) and is designed for applications requiring low output ripple/noise. The RAMPAC can atten-
uate the ripple/noise down to 10 mV peak-to-peak over a 20 MHz bandwidth from 10% to 100%
of rated load of the converter. Each RAMPAC can provide up to 100 watts of output power, and
outputs from 5V to 50V are available. An optional DC Power Good signal, or output voltage Trim
potentiometer can be specified. The RAMPAC contains output overcurrent protection, which
recovers automatically when the overcurrent condition is removed. Overvoltage and overtempera-
ture protection are not available.
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VI-200
VI-J00 VI-J00
+
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VI-J00
+
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VI-J00
RAM
Figure 2. ModuPAC
Figure 3. DualPAC
Figure 4. JuniorPAC
Figure 5. RAMPAC
+
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VI-900
Figure 3. UniPAC