VICOR PFC MegaPAC User manual

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 1
Westcor PFC MegaPACTM
Power Factor Corrected AC-DC Switchers
USER GUIDE | UG:105
May 2013
Overview
The PFC MegaPAC family of supplies combine power factor correction (PFC) with the
inherent configurability of all Westcor MegaPAC products. This design guide covers 4
model variations:
1. PFC MegaPAC 1600 W max, standard chassis
2. PFC MegaPAC MI 1600 W max, rugged COTS chassis
3. PFC MegaPAC High Power 2400 W max, standard chassis
4. PFC MegaPAC High Power MI 2400 W max, rugged COTS chassis
All PFC MegaPACs have the same input and output connections, mounting points, and
the same dimensions:
The extended length (-EL) chassis is covered in a dierent design guide
A complete power supply is configured at the factory by selecting and inserting up to
eight same length slide-in output assemblies called ConverterPACs. ConverterPACs
incorporate one (or more) VI-200/VI-J00), Maxi Vicor DC to DC converters and/or
FlexPACs and are available in a wide selection of output voltage and power levels.
The net result is a power supply that oers the advantages of a custom supply, but is
assembled from standard and modular building blocks. Currently, the standard power
chassis uses only FlexPACs and ConverterPACs with VI-200/VI-J00 Vicor DC to DC
converters while the high power chassis accepts FlexPACs and ConverterPACs with
both VI-200/VI-J00 and/or Maxi module. (Refer to page 6 for a brief overview of the
ConverterPACs used.) Using the PowerBench configurator tool available on
www.vicorpower.com, anybody can now configure a PFC MegaPAC (and other Westcor
power supplies) online.
Contents Page
Overview 1
of Product
Mechanical 3
Considerations
MegaPAC 3
Do’s and Don’ts
Technical Description 4
Configuring and 5
Reconfiguring
MegaPACs
ConverterPAC 6
Description
ConverterPAC 10
Output and Connector
Pin Identification
Quick Install 12
Instructions
Mechanical Drawings 15
Interface Connections 16
Specifications 23
Power Derating 25
Connector Kit Listing 25
Current Share Boards 26
Low Leakage Version 29
Output Sequencing 30

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 2
Manufactured at Westcor, a division of Vicor, the entire family of MegaPAC power
supplies is completely user-configurable. If output requirements change, i.e., more
power or a dierent output voltage is needed, upgrading is easy: simply unlock a
single screw and replace the slide-in ConverterPAC assembly with one that is of
the same length and has the desired voltage power rating. For additional flexibility,
ConverterPACs can be connected in parallel to increase output power (booster
ConverterPACs), or in series for higher voltages (total output voltage should not exceed
400 V). The driver is to the le of the boosters when looking at the output end of the
supply. A user-friendly interface provides control and output sequencing capability
(see page 30 for more information about this capability), in addition to useful status
indicators. Please consult our Applications Engineering Department if you have other
special requirements.
Standard Features
nPower Factor Correction; 0.99 at 115 Vac, 0.95 at 230 Vac - both at full load (47-63Hz)
nUniversal Input: 85-264 Vac, 47-500 Hz, or 100-380 Vdc
nPower Outputs:
Standard Chassis: 1,600W at 230 Vac High Power Chassis: 2,400W at 230 Vac
1,200W at 115 Vac 1,200W at 115 Vac
nOutputs:
Standard Chassis: Up to 32 outputs High Power Chassis: Up to 32 outputs
nFan Cooled
nFull power to 40°C; half power to 60°C
nSo start for limiting inrush current
nConducted EMI meets FCC class A and EN 55022 class A
Some configurations meet Class B. Consult Factory
nHarmonic Distortion to EN61000-3-2
nRoHS compliant available
nOutput Sequencing and General Shutdown
(Refer pg. 25. Consult Applications Engineering for automatic sequencing circuitry.)
nOvercurrent protection on all outputs
nOvervoltage protection and Overtemperature limiting on all ConverterPAC outputs
(not applicable with VI-J00)
nSize: 3.4”H x 6.0”W x 12.4”L (313,9mm x 152,4mm x 309,mm)
nSafety Agency Approvals: cURus, cTUVus, CE Mark
Optional Features
nDC OK status signal
nCurrent Share Boards - see pages 26 - 28
nOutput voltage adjustment range with built-in potentiometer
nLow Leakage Version available upon request - see page 29
n-40C operation
nConformal Coating (contact factory)

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 3
Mechanical Considerations
The PFC MegaPAC can be mounted on any of four surfaces using standard 8-32 or
4mm screws. The chassis comes with four mounting points on each surface; maximum
allowable torque is 5.5 lb-in. The maximum penetration is 0.15 in. (3.8mm).
When selecting a mounting location and orientation, the unit should be positioned
so air flow is not restricted. Maintain a 2" minimum clearance at both ends of the PFC
MegaPAC and route all cables so airflow is not obstructed. The standard unit draws air
in at the fan side/AC input side and exhausts air out the load side. If airflow ducting is
used, use caution, as sharp turns could present back pressure to the PFC MegaPAC. The
fan moves approximately 30 CFM of air.
Avoid excessive bending of output power cables aer they are connected to the PFC
MegaPAC . For high-current outputs, use cable ties to support heavy cables in order to
minimize mechanical stress on output studs. Be careful not to short-out to neighboring
output studs. The PFC MegaPAC units are supplied with serrated, flanged hex-nuts on
all output studs. Therefore, thread locking compounds or lock washers are not required.
The maximum torque recommended on flanged nuts is 45 lb-in. Never loosen the inner
nut on a ConverterPAC. This nut supports the hardware inside the ConverterPAC and is
factory torqued.
Avoid applications in which the unit is exposed to excessive shock or vibration levels. In
such applications, a shock absorption mounting design is required.
MegaPAC Do’s and Don’ts
nRemote sense should be used:
- To improve poor output regulation.
- When using older ConverterPACs that do not have the autosense feature.
nNEVER connect the remote sense wires in reverse.To avoid failures, always terminate
the +Sense to the +Out and the -Sense to the -Out.
nIf needed, compatible connector kits can be ordered separately. Refer to page 25 for
additional information regarding connector kits.
nTo avoid overheating, NEVER operate the supply with an open output slot. Open slots
should always be filled with a ConverterPAC or a plastic airblock designed for
the PFC MegaPAC.
nAlways turn the power supply OFF before disconnecting any input or output wires.
Failure to do so may lead to an electrical shock hazard and or damage to
the power supply.
nDo not insert or remove a ConverterPAC while the power supply is running.
They are not designed for hot insertion or extraction.
nWait 5 minutes aer shutting o the power supply before inserting or
removing a ConverterPAC.
nDo not restrict airflow to or from the supply as this can cause overheating damage.
nBooster ConverterPACs are available for power expansion. Refer to page 6 for
additional information.
nDo Not use boosters as independent outputs. Operating boosters with disconnected
bus bars will cause failures.
nBefore turning on the unit ensure all input and output wire are properly connected
and all hex nuts properly tightened.
nKeep output wires as short as possible and run the output (+/-) power cables next to
each other. Use twisted pair wiring whenever possible.

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 4
nAvoid running input and output wiring in close proximity as this may cause noise
related problems.
nPFC MegaPACs are NOT user serviceable. Please contact our customer service
department at 1-800-735-6200 for repair assistance. Please be advised that attempts
to repair or modify the power supply will void the warranty.
nA proper fault protection device (fuse or breaker) should be used in series with
the input terminals.
nUse proper size wires to avoid overheating and excessive voltage drop.
nNEVER loosen the inner nut on a ConverterPAC.
nFinPAC ConverterPACs can only be used with a high power chassis. A high power
chassis is identified by an “MX” prefix code in the specific model number.
nOutput voltages over 60 Vdc, whether from individual modules or series arrays, are
considered as hazardous secondary outputs under UL 60950. Appropriate care must
be taken in design implementation of the supply.
Technical Description
The PFC MegaPAC chassis consists of an o-line single phase, power-factor-corrected
front end, EMI filter, cooling fan, customer interface and associated housekeeping
circuits. Input AC mains voltage (L1, L2 and GND) is applied to a terminal block. The
input current is passed through an EMI filter designed to meet conducted noise limit “B”
specifications of FCC Part 15, VDE 0871, and EN55022 class A At start-up, inrush current
is limited by a PTC thermistor. The PTC is shunted out shortly aer initial power-up by
a DC bus voltage Sense circuit driving a relay. Aer rectification, the input voltage is put
through a boost converter that keeps the AC input current sinusoidal and synchronized
with the AC input voltage (in compliance with EN61000). The boost converter delivers
regulated high voltage DC to the hold-up capacitors and backplane. The backplane
supplies power to a variety of ConverterPAC assemblies that provide the desired
regulated outputs.
Voltage conversion in the output assemblies is achieved by Vicor’s family of
Zero-Current-Switching (ZCS) DC to DC converters. These are forward converters in
which the main switching element switches at zero current. This patented topology has
a number of unique attributes: low switching losses; high frequency operation resulting
in reduced size for magnetics and capacitors; excellent line and load regulation; wide
adjustment range for output; low EMI/RFI emissions and high eciencies.
At initial power-up the PFC MegaPAC outputs are disabled to limit the inrush current
and to allow the DC bus potential to settle out to the correct operating level. A low-
power flyback converter operating with PWM current-mode control converts the
high voltage DC bus into regulated low voltage to power the internal housekeeping
circuits and DC cooling fan. The internal housekeeping Vcc comes up within 2 s aer
the application of input power. Once the high voltage bus is within its limits, the AC
OK signal asserts to a TTL “1” indicating the input power is OK, and enables the power
outputs. An auxiliary Vcc output of 5 Vdc sourcing up to 0.3 A is provided for
peripheral use.
An output Enable/Disable function is provided by using an optocoupler to control
the Gate In pins of the ConverterPAC assemblies. If the Enable/Disable control pin is
pulled low, the optocoupler turns on, pulling the Gate In pin low and disabling the
ConverterPAC output. The nominal delay for an output to come up when measured
from release of the Enable/Disable pin is 10-15 ms. The General Shutdown function
controls all outputs simultaneously and works in a similar manner.

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 5
The ride-through (holdup) time is the amount of time the load can be supported before
loss of output regulation aer the loss of input power. Detecting the loss of input power
takes a finite time period aer which the AC Power OK signal goes from a TTL “1” to “0."
This signal is available for use within 1.2 seconds aer initial power-up and can be used
to indicate an impending loss of power. At least 3 ms of warning time is given. Following
the loss of input power, the outputs are disabled when the bus voltage drops below its
operating threshold.
Configuring and Reconfiguring MegaPACs
Most ConverterPACs of the same length can be inserted into any available slot of a
MegaPAC chassis. They can also be easily added, replaced, or moved by sliding the
assemblies in or out of a MegaPAC chassis. (Currently, two exceptions are the FinPACs
which can only be used in the high power chassis and the UniPACs which can only be
used in the 4 kW MegaPAC.) For outputs greater than 200 Watts, a driver ModuPAC
and one or more booster ConverterPACs will be used. For outputs greater than
600 Watts, a driver FinPAC 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 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 le 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 aer the ConverterPAC has been installed.
Line Filter Rectifier Soft Start
Circuit Boost Converter
PFC Control
E/D Control
ConverterPAC #1
ConverterPAC #2
ConverterPAC #3
ConverterPAC #8
Fan
Housekeeping
Power
Current
Monitor
Customer
Interface
Power
Output
Power
Output
Power
Output
Power
Output
Input
High Voltage
DC Bus
Enable/Disable Control
Current
Sample
Waveform
Sample
Figure 1.
PFC MegaPAC and PFC
MegaPAC-High Power
Architecture

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 6
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 slots #1 and 3 boosters placed in slots # 2 to 4. Aer
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 www.vicorpower.com.
ConverterPAC Functional Description
ConverterPACs are the family of slide-in output assemblies used in MegaPAC power
supplies. Most ConverterPACs of the same length are interchangeable within a
MegaPAC and between dierent AC input MegaPAC chassis (Exceptions are the FinPAC
and UniPAC). They can be added, moved, or changed as necessary. The following
ConverterPACs can be used in the PFC MegaPAC and/or PFC MegaPAC-High Power.
Spec sheets for ConverterPACs are available at www.vicorpower.com
ModuPAC
The ModuPAC output assembly consists of a VI-200 DC to DC converter that converts
the 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 provide 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 potentiometer can be specified. The
ModuPAC contains overvoltage protection (OVP), overcurrent protection (OCP), and
overtemperature limiting (OTL). The OCP has automatic recovery when the overcurrent
condition is removed. The OVP and OTL are latching functions and require recycling of
the AC input power to restart.
Figure 2.
Paralleling ConverterPACs
Driver
Bus Bars for Paralleling
Loosen screw to
remove ConverterPAC
Boosters
12345678
+
_
Remote Sense
VI-200
Output Adjust
- Vout
+ Vout
DC OK (Power Good)
ModuPAC

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 7
JuniorPAC
The JuniorPAC consists of a VI-J00 DC to DC converter that converts the high voltage
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 protection and overtemperature limiting are not available.
DualPAC
This output assembly consists of two VI-J00 DC to DC converters that convert the high
voltage bus to the desired regulated output voltages as noted above. The outputs are
electrically isolated. For detailed pin out description, refer to page 10.
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 attenuate 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.
Outputs from 5 V to 50 V are available.
BatPAC
The BatPAC output assembly consists of a VI-200 BatMod current source that converts
the high voltage bus to the desired regulated output voltage. The converter is fused with
a PC-Tron, DC-rated, fast-acting fuse. The BatPAC is a 200 Watts programmable current
source that can be configured as a battery charger. Maximum current and voltage
settings are controlled using potentiometers that come as a standard feature, or through
Trim pin access as an option. BatPACs are available for 12 V, 24 V and 48 V
battery systems.
FINPAC
The FinPAC output assembly consists of a Maxi DC to DC converter that converts the
unregulated high voltage bus to the desired regulated output voltage. Each Maxi module
can provide up to 600 Watts of output power. Each FinPAC occupies 2 slots because
it has an extra large heatsink attached to dissipate the heat generated by this more
powerful Maxi converter. Currently, the FinPAC is ONLY used in the high power (MX)
chassis. It cannot be used in any other member of the MegaPAC Family.
Contact Westcor for future updates.
FlexPAC
The FlexPAC output assembly consists of from 2 to 4 discrete outputs that convert the
high voltage bus to the desired output voltage. Each FlexPAC output can be manually
trimmed from 2 V to 25 V and supports up to 5 amps with a maximum output power
of 50 W per output. All outputs maintain less than 50 mV noise over the entire output
range. All outputs support local sense only. For electrical trim options and specific
output sequencing contact the factory.
+
_
VI-J00
Remote Sense
Output Adjust
- Vout
+ Vout
DC OK (Power Good)
Remote Sense
Output #2 Adjust
Output #2
Output #1
Remote Sense
Output #1 Adjust
VI-J00 VI-J00
M2 M1
M1
M2
+
_
VI-J00 RAM
Remote Sense
Output Adjust
- Vout
+ Vout
DC OK (Power Good)
+ Vout
VI-200/BatMOD
- Vout
Remote Interface
Voltage Limit Adjust
Current Limit Adjust
+
_
+
_
Remote Sense
Maxi
Output Adjust
- Vout
+ Vout
DC OK (Power Good)
M-1 STATUS
M-1 VOLTAGE ADJUSTMENT
M-4 STATUS
M-3 STATUS
M-2 VOLTAGE ADJUSTMENT
M-2 STATUS
M-4 VOLTAGE ADJUSTMENT
M-3 VOLTAGE ADJUSTMENT
CONNECTOR J1
JuniorPAC
DualPAC
RAMPAC
BatPAC
ModuPAC
FlexPAC

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 8
List of ConverterPACs used in the PFC MegaPAC and
PFC MegaPAC-High Power and their features
ConverterPAC OVP OCP OTL RS/AS LS/AS PG TrimPot
ModuPAC Std Std Std AS* AS* Opt Opt
JuniorPAC N/A Std N/A AS* AS* Opt Opt
DualPAC N/A Std N/A AS* AS* N/A Opt
RAMPAC N/A Std N/A AS* AS* Opt Opt
BatPAC N/A Std N/A N/A N/A N/A Std
FinPAC** Std Std N/A AS* AS* Opt Opt
FlexPAC Std Std Std LS LS N/A Std
* See pages 12 and 13 for more information on Autosense.
** All the above mentioned ConverterPACs can be used in both the PFC MegaPAC and PFC MegaPAC-
High Power except the FinPAC which currently can only be used in the PFC MegaPAC-High Power.
(The UniPAC - not listed above - cannot be used either in the PFC MegaPAC or the PFC MegaPAC-
High Power. Currently, the UniPAC is only used in the 4 kW MegaPAC.)
Note: All ConverterPACs mentioned above can be paralleled EXCEPT the DualPAC,
JuniorPAC and RamPAC.
Part Numbering
PFC MegaPAC Mpaa-7bcccc-v-xx
p= P for standard chassis p= X for high power chassis
aa = number of outputs
b= number of DC-DC modules and FlexPACs
cccc = customer specific configuration code
v= optional revision code and may be blank (note: v = G for RoHS compatible
product)
xx = additional option codes
Note: xx = MI for rugged chassis, = MC for rugged chassis with conformal coating
ConverterPAC XxDV/xEAxF
X= ConverterPAC type (For RoHS, add G to current prefix)
xD= Voltage out
xE= Current out (rounded to 1 decimal point)
xF= Can be multiple options* (see page 9)

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 9
Part Numbering (Cont.)
* ConverterPAC options
BBooster module STrimpot removed for external
DDC OK or Power Good1BatPAC adjustment
FFull 50-110% output adjustment2T90-110% output adjustment4
F1 50-107.5% output adjustment T1 90-107.5% output adjustment
F2 50-105% output adjustment T2 90-105% output adjustment
F3 50-102.5% output adjustment T3 90-102.5% output adjustment
F4 50-100% output adjustment T4 90-100% output adjustment
F5 60-110% output adjustment T5 98-105% output adjustment
F6 70-110% output adjustment T6 100-110% output adjustment
F7 80-110% output adjustment V1 "VXI" low noise (150 mV or less)
IIndustrial Grade module 15V< VOUT ≤ 24 V5
KCustom SRF module used V2 "VXI" low noise (50 mV or less)
PPreload VOUT ≤ 15 Vdc
MMilitary Grade module V3 “VXI” low noise (1% ripple or less)
RRAM external3VOUT > 24 V
Examples:
M15V/10A, M15V/10ADFI, D15V/6.7A-12V/8.3AT
M= ModuPAC (RoHS =GM) R= RAMPAC (RoHS = GR)
D= DualPAC (RoHS = GD) B= BatPAC (RoHS = GB)
J= JuniorPAC (RoHS = GJ) PZ = PZ - FinPAC (RoHS = GPZ)
[1] D option: Optional for all ConverterPACs EXCEPT the DualPAC, BatPAC and RamPAC
[2] F options: Optional for all ConverterPACs EXCEPT the BatPAC, DualQPAC, and FlexPAC. Trim range
dependent on module type and voltage
[3] R option: When using an external RAM, components such as autosense resistors and local sense
jumpers must be removed before turning on the supply. In addition, in order to insure proper operation,
sense pins must be connected either locally or remotely after the RAM's output. For further information,
contact Applications Engineering.
[4] T options: Optional for all ConverterPACs EXCEPT the BatPAC, DualQPAC, and FlexPAC. Trim Range
dependent on module type and voltage
[5] V options: Optional ONLY on the ModuPAC, DualPAC and JuniorPAC. N/A on all other
ConverterPACs. Requires 15% minimum load.
FlexPAC Fxxaaa-bbb-ccc-ddd
F= FlexPAC
xx = pack chassis variations
aaa = voltage setting for output 1 with implicit factor of 10 (103 = 10.3 V)
bbb = output 2

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 10
ConverterPAC Output and Connector Pin Identification for the PFC MegaPAC
ModuPAC
JuniorPAC
RAMPAC
J2-PIN1
J3-PIN1
+ V0UT
- VOUT
(REMOTE SENSE)
J2
2
1
3- SENSE
+ SENSE
MATING HDWR:
TRIM PIN ACCESS
3POWER GOOD
2
1SIGNAL GROUND
POWER GOOD INVERTED
MATING HDWR:
4
J3 DC OK (POWER GOOD)
Vcc IN
HOUSING- MOLEX P/N: 50-57-9403
TERMINALS- MOLEX P/N: 16-02-0103
CRIMP TOOL MOLEX P/N: 11-01-0208
HOUSING- MOLEX P/N: 39-01-0043
TERMINALS- MOLEX P/N: 30-00-0031
CRIMP TOOL MOLEX P/N: 57005-5000
MODUPAC/JR.PAC/RAMPAC
OUTPUT ADJUST
DualPAC
J2-B-PIN1
OUTPUT ADJ. #1
J2-A-PIN1
J2
(REMOTE SENSE) MATING HDWR:
HOUSING- MOLEX P/N: 50-57-9403
TERMINALS- MOLEX P/N: 16-02-0103
CRIMP TOOL MOLEX P/N: 11-01-0208
3- SENSE
+ SENSE
1TRIM PIN ACCESS
2
OUTPUT ADJ. #2
J1-B-PIN1
J1-A-PIN1
(OUTPUT CONNECTORS)
1 AND 4 +V OUT
33 +R/SENSE 6 -R/SENSE
1
2
J1
TERMINALS- MOLEX P/N: 39-00-0039
HOUSING- MOLEX P/N: 39-01-2060
CRIMP TOOL MOLEX P/N: 11-01-0197
MATING HDWR:
6
5
4
2 AND 5 -V OUT
DUALPAC
20-130182-TAB
J1-B (M1)
J1-A (M2)
M2 M1
Output A
48V/2.1A
Output B
12V/8.3A
Example: D12V/8.3A-48V/2.1A
DUALPAC - COMPONENT SIDE VIEW
Note:
1. All ConverterPACs except the FinPAC occupy one slot. The FinPAC occupies two slots.
2. New output studs were installed on the ConverterPACs and are 1/8th inch longer. Refer to page 24
for more information.

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 11
ConverterPAC Output and Connector Pin Identification for the PFC MegaPAC
BatPAC
VOLTAGE LIMIT ADJUST
J2 (BATPAC REMOTE INTERFACE)
CURRENT MONITOR
CURRENT LIMIT ADJUST
- VOUT
VOLTAGE LIMIT ADJUST
1
- VOUT
3
2
4
J3-PIN1
CURRENT LIMIT ADJUST
CRIMP TOOL MOLEX P/N: 57005-5000
TERMINALS- MOLEX P/N: 30-00-0031
HOUSING- MOLEX P/N: 39-01-0043
MATING HDWR:
+ V0UT
FinPAC
12 4356
789 10 11 12
M1
M2
M3
M4
++++
––
–
–
n/a
n/a n/a
n/a
Note:
1. All ConverterPACs except the FinPAC occupy one slot. The FinPAC occupies two slots.
2. New output studs were installed on the ConverterPACs and are 1/8th inch longer. Refer to page 24
for more information.
FlexPAC
P2 REMOTE SENSE TRIM/SC & POWER GOOD
POWER GOOD INVERTED
TRIM
5
3
2
4
1SIGNAL GROUND
POWER GOOD
Vcc IN
7
6
+SENSE
-SENSE
TERMINALS- MOLEX P/N: 39-00-0031
HOUSING- MOLEX P/N: 39-01-0073
CRIMP TOOL MOLEX P/N: 57005-5000
MATING HDWR:
P2-PIN1
- OUT
+ 0UT
OUTPUT ADJUST
M-1 STATUS
M-1 VOLTAGE ADJUSTMENT
M-4 STATUS
M-3 STATUS
M-2 VOLTAGE ADJUSTMENT
M-2 STATUS
M-4 VOLTAGE ADJUSTMENT
M-3 VOLTAGE ADJUSTMENT
CONNECTOR J1
MATING HDWR:
HOUSING MOLEX P/N 39-01-2120
TERMINALS MOLEX P/N 39-00-0039
CRIMP TOOL MOLEX P/N 11-01-0197

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 12
PFC MegaPAC “Quick Install” Instructions (For Mechanical Drawing, see page 15)
Mounting the PFC MegaPAC and PFC MegaPAC-High Power
nMount the power supply on any of its four sides.
nUse #8-32 or 4mm mounting screws. Do not exceed a maximum penetration of 0.15"
(3,8mm). The maximum allowable torque is 5.5 lb-in.
nMaintain 2" (5,1cm) clearance at either end for airflow.
Input Connections
Input Power J9
nApply input AC power to terminal block J9 using a pressure screw terminal.
nStrip length of AC power conductors to be 0.35 inches.
nMaximum torque is 4.4 lb-in.
nPlace a fuse or circuit breaker in the input line for safety reasons.
nUse a maximum wire size of 14 AWG with soldered terminals.
nThe connector manufacturer recommends the wires not be tinned. A ferrule (Phoenix
P/N 32-00-58-0, purchased from other sources) can be used to prevent fraying.
Output Connections
Power Connections
Installing ring lugs and/or bus bars on output studs:
nThe upper stud is Positive and the lower stud is the Return.
nNewer outputs studs are 1/8th inch longer. See page 24 for more information.
nRemove nut.
nPlace ring lug over output stud.
nReplace and tighten outer nut to a maximum torque of 45 lb-in.
Do Not Over-Tighten Nuts.
nVerify all output nuts are properly installed before turning on supply.
Installing power connectors on DualPACs (J1A and J1B):
nUse Molex mating receptacle #39-01-2060 with #39-00-0039 terminals provided.
nPins 1 and 4 are Positive, while pins 2 and 5 are the Return.
nAttach terminals to 18-24 AWG stranded wire using Molex tool #11-01-0197.
Sense Connections
Note: Newer power supplies have the Autosense feature. For these units, if Remote
Sense connections are not made or needed, no Local Sense selection is necessary -
simply connect the output to the load and the unit will automatically operate in Local
Sense. If Remote Sense connections are made, the unit will operate in a Remote Sense
mode. Remote Sense terminals should be terminated to their respective output i.e. - RS
to - Output and + RS to + Output. See page 13 for more information on Autosense.
For units without Autosense, sense connections must ALWAYS be made. Not
connecting sense lines to their respective output can cause failure to the unit.
INPUTS DO NOT
WITHOUT
EARTH
GROUND
L2
115/230 VAC
300VDC
47 TO 500 Hz
OPERATE
NOTE: SET SCREW MAXIMUM
TORQUE = 4.4 INCH POUNDS
LABEL NO: 94-00046 REV B
L1
J2 Pin 1
J3 pin 1 (DC OK Option)
+ Vout
- Vout
MODUPAC/JR.PAC/RAMPAC
Vtrim Pot Adjust (Option)
J1B
+
46
-
5
+
+RS
-
-RS
321
J1A
321
46
+RS
-RS
+
+
-
5
-
Input Panel Connectors
Single Output ModuPAC
DualPAC Output Connector

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 13
Sense Connector J2 (and P2 for the FinPAC):
nSense connections do not have to be made if the Local Sense option was ordered or if
Autosense is present (see above note on Autosense.)
nUse Molex mating receptacle #50-57-9403 with #16-02-0103 terminals provided.
nJ2-2 is the +Sense and J2-3 is the -Sense.
nAttach terminals to 22-24 AWG twisted pair wire using Molex tool #11-01-0208.
nAttach opposite ends of Sense lines to point where regulation is desired.
nVerify that Sense lines are not cross-connected before applying input power.
nFor the FinPAC, P2-7 is the + Sense and P2-6 is the -Sense.
nUse Molex mating receptacle #39-01-0073 with #39-00-0031 terminals provided
nAttach terminals to 22-28 AWG stranded wire using Molex tool #57005-5000.
Sense Connections on DualPACs:
nSense connections do not have to be made either if the Local Sense option has
been ordered or Autosense is present (refer to note on Autosense).
nSense connections are available on the J2 connector (P2 for the FinPAC)
or the J1A and J1B connectors.
nIf using J2 or P2 connector, see instructions on page 10.
nOn J1A and J1B, Pin 3 is the +Sense and Pin 6 is the -Sense.
nUse Molex mating receptacle #39-01-2060 with #39-00-0039
terminals provided.
nAttach terminals to 18-24 AWG twisted pair wire using
Molex tool #11-01-0197.
nVerify that Sense lines are not cross-connected before applying input power.
Trim Pin Connection J2 (and P2 for FinPAC)
nThe Trim J2 connection should only be made if the Trim option has not been
installed. (A “T” or an “F” in the ConverterPAC part number means the Trim option is
installed; e.g. M5V/40AT.)
nUse Molex mating receptacle #50-57-9403 with #16-02-0103 terminals provided.
nAttach terminals to 22-24 AWG stranded wire using Molex tool #11-01-0208.
nJ2-1 provides Trim access.
nFor the FinPAC, refer to P2 Connector. P2-5 provides Trim Access.
nUse Molex mating receptacle #39-01-0073 with #39-00-0031 terminals provided.
nAttach terminals to 22-28 AWG stranded wire using Molex tool #57005-5000.
1
2
3
J2 Sense Connector
J2-1 Trim Pin Access
J2-2 +Sense
J3-3 -Sense
Pin
J2
6 -REMOTE SENSE
3 +REMOTE SENSE
2 and 5 -V OUT
1 and 4 +V OUT
PIN
J1B
+
46
-
5
+
+RS
-
-RS
321
J1A
321
46
+RS
-RS
+
+
-
5
-
P2 Sense Connector
POWER GOOD INVERTED
TRIM
5
3
2
4
1SIGNAL GROUND
POWER GOOD
Vcc IN
7
6
+SENSE
-SENSE
1
2
3
J2 Trim Pin Connector
J2-1 Trim Pin Access
J2-2 +Sense
J3-3 -Sense
Pin
J2
P2 Trim Pin Connector
POWER GOOD INVERTED
TRIM
5
3
2
4
1SIGNAL GROUND
POWER GOOD
Vcc IN
7
6
+SENSE
-SENSE
DualPAC Output Connector

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 14
DC OK (Power Good) Connection J3 (and P2 for FinPAC)
nDC OK is only available as an option and is not always present.
nJ3-4 is Vcc In, J3-3 is Power Good, J3-2 is Power Good inverted, and J3-1
is Signal Ground.
nUse Molex mating receptacle #39-01-0043 with #39-00-0031
terminals provided.
nAttach terminals to 22-28 AWG stranded wire using Molex tool #57005-5000.
nFor the FinPAC, refer to the P2 Connector. P2-3 is Power Good.
nUse Molex mating receptacle #39-01-0073 with #39-00-0031
terminals provided.
nAttach terminals to 22-28 AWG stranded wire using Molex tool #57005-5000.
Interface Connections J10
nUse Molex mating receptacle #39-01-2120 with #39-00-0039 terminals provided.
nJ10-1 to 8 are Enable/Disable for slots 1-8.
nJ10-9 is Vcc, J10-10 is Signal Ground, J10-11 is AC Power OK, and J10-12
is General Shutdown.
nAttach terminals to 18-24 AWG stranded wire using Molex tool #11-01-0197.
FlexPAC Connections J1
nUse Molex mating receptacle #39-01-2120 with #39-00-0039 terminals provided.
nAttach terminals to 18-24 AWG stranded wire using Molex tool #11-01-0197.
nJ1 pins 11, 5, 12 and 6 are for special trim options. Contact factory for use.
nLocal Sense only.
4
3
2
1
J3
J3-4 Vcc
J3-3 Power Good
J3-2 Power Good Inverted
J3-1 Si
g
nal Ground
Pin
DC OK (Power Good)
P2 DC OK Connector
POWER GOOD INVERTE
D
TRIM
5
3
2
4
1SIGNAL GROUND
POWER GOOD
Vcc IN
7
6
+SENSE
-SENSE
12
1110
9
8
7
65
43
2
1
J10
J10-9
J10-10
J10-11
J10-12
Vcc +5V, 0.3A
SIGNAL GROUND
AC POWER OK
GEN SHUTDOWN
J10 INTERFACE
J10-1
J10-2
J10-3
J10-4
J10-5
J10-6
J10-7
J10-8
E/D-1
E/D-2
E/D-3
E/D-4
E/D-5
E/D-6
E/D-7
E/D-8
12 4
35
6
789 10 11 12
M1
M2
M3
M4
++++
––
–
–
n/a
n/a n/a
n/a
7–VOUT M1
8–VOUT M2
9–VOUT M3
10 –VOUT M4
11 DO NOT USE
12 DO NOT USE
1+VOUT M1
2+VOUT M2
3+VOUT M3
4+VOUT M4
5DO NOT USE
6DO NOT USE

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 15
PFC MegaPAC Mechanical Drawing
12
1110
9
8
7
65
43
2
1
J10
14 AWG WIRE
M4 OR #8-32 THREAD MAXIMUM SCREW PENETRATION .150 [4.00 MM]
J10-9 J10-1O J10-11 J10-12
Vcc +5V, 0.3A SIGNAL GROUND AC POWER OK GEN SHUTDOWN
J10 INTERFACE
J10-1 J10-2 J10-3 J10-4 J10-5 J10-6 J10-7 J10-8
E/D-1 E/D-2 E/D-3 E/D-4 E/D-5 E/D-6 E/D-7 E/D-8
INPUTS DO NOT
WITHOUT
EARTH
GROUND
L2
115/230 VAC
300VDC
INPUT CONNECTIONS
J9-1 EARTH GROUND J9-2 L2-NEUTRAL J9-3 L1
HOUSING-MOLEX P/N: 39-01-2120.
L1
47 TO 500 Hz
OPERATE
CLAMPING SCREWS
NUT ZINC PLATED STEEL
WITH OPTIONAL BUSS BARS
1/4 - 20 SERRATED FLANGED
CUSTOMER MOUNTING HOLES (16X) FROM OUTSIDE SURFACE.
47TO 500 Hz
300VDC
115/230 VAC
L2
INPUTS
L1
OPERATE
GROUND
EARTH
WITHOUT
DO NOT
MATING HDWR: TERMINALS-MOLEX P/N: 39-00-0039 CRIMP TOOL-MOLEX P/N: 11-01-0122
RE-DESIGNED STUD AND PANEL ORIGINAL STUD AND PANEL
(T0P AND BOTH SIDES)
(RE-DESIGNED LENGTH)
(ORIGINAL LENGTH)
FAN
(DIRECTION OF AIR
FLOW OPTIONAL)
6.04 [153.42]
3.37 [85.60]
6.75 [171.45]
2.92 [74.17]
.21 [5.33]
.25 [6.35]
5.10 [129.54]
.47 [11.94]
.41 [10.35]
2.75 [69.85] 6.75 [171.45]
11.93 [302.90]
2.92 [74.17]
.21 [5.33]
6.75 [171.45]
.53 [13.39]
12.36 [313.87]
12.24 [310.83]
3.28 [83.19]
.47 [11.94]
2.77 [70.23]
1.40 [35.56]
.73 [18.52]
1.46 [37.03]
5.10 (129.5 MM)
7 SP. @ .7285
(18.5 MM)
NOTE: SET SCREW MAXIMUM
TORQUE = 4.4 INCH POUNDS
TORQUE = 4.4 INCH POUNDS
NOTE: SET SCREW MAXIMUM
LABEL NO: 94-00046 REV B
LABEL NO: 94-00046 REV B
ORIGINAL RE-DESIGNED
OUTPUT PANEL AND STUDS
NOTE: EITHER THE ORIGINAL OR RE-DESIGNED OUTPUT STUD AND PANEL COMBINATION
MAY BE PRESENT. THE NEW OUTPUT PANEL HAS A BRASS INSERT AND THE STUD IS 1/8 INCH LONGER. (SEE SHEET ONE FOR DIMENSIONAL DATA).
FLANGED BRASS NUT INSERT

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 16
Interface Connections
Chassis Input Power Terminals (J9)
Input AC power is applied to terminal block J9 using a pressure screw terminal that
accepts a maximum wire size of 14 AWG. The insulation should be stripped .35 inches
and the maximum torque applied to the screws should not exceed 4.4 lb-in. The
connector manufacturer recommends the wires not be tinned. A ferrule (Phoenix P/N
32-00-58-0, purchased from other sources) can be used to prevent fraying. J9-1 (GND) is
Earth Ground for safety; J9-2 (L2) and J9-3 (L1) are the other Hot connections. For Input
DC power, L2 is (+) and L1 is (-).
A fault clearing device, such as a fuse or circuit breaker with a maximum 15A rating at
the power supply input is required for safety agency compliance. It should be sized to
handle the start-up inrush current of 25A pk at 115 Vrms and 230 Vrms.
Output Power Connections (+P, -P for Single Output, or J1A/J1B for Dual Outputs)
For single output ConverterPACs, these terminals are two 1/4-20 plated steel studs. The
upper stud is positive with respect to the lower stud. For dual output ConverterPACs,
there is a 6-pin Molex connector for each output. J1A pins 1 and 4 are the +Output,
and J1A pins 2 and 5 are the -Output. Pins 3 and 6 are duplicates of the Remote Sense
terminals present on J2A and J2B. Use appropriate wire size rated to handle the full
output current, including short circuit levels. Avoid large current loops in output cables;
run power and return cables next to one another to minimize inductive eects. All
outputs are isolated and can provide positive or negative outputs.
Output +/-Sense Connections -J2 for Single Output, or J1A/J1B for Dual Outputs
Newer power supplies may have some outputs configured with the Autosense feature
that automatically locally senses the output if remote sense is not used. To check if an
output has the Autosense feature, measure the impedance from the + Out to + Sense and
- Out to - Sense pins. If the impedance is 5 ohms, then the output has Autosense and
does not require local sense jumpers. FlexPAC is local sense only.
If units do not have Autosense, sense connections must be made. When making
sense connections, keep in mind that although all outputs are open-Sense protected,
the +/-Sense terminals must be connected to their respective outputs before the PFC
MegaPAC and PFC MegaPAC-High Power are powered up. Regardless of the output
polarity configured, the +Sense should always connect to the +Power output. The
-Sense connects to the -Power output. Sense connections are not required on booster
ConverterPACs, BatPACs, or if the Local Sense option is specified. Local Sense mode
means that the Remote Sense lines are not connected. Sense pins can be accessed on
J1A/J1B or J2A/J2B on dual output units.
INPUT CONNECTIONS
J9-1 EARTH GROUND
J9-2 L2-NEUTRAL
J9-3 L1
INPUTS DO NOT
WITHOUT
EARTH
GROUND
L2
115/230 VAC
300VDC
47 TO 500 Hz
OPERATE
NOTE: SET SCREW MAXIMUM
TORQUE = 4.4 INCH POUNDS
LABEL NO: 94-00046 REV B
L1
u
INPUTS DO NOT
WITHOUT
EARTH
GROUND
L2
115/230 VAC
300VDC
47 TO 500 Hz
OPERATE
NOTE: SET SCREW MAXIMUM
TORQUE = 4.4 INCH POUNDS
LABEL NO: 94-00046 REV B
L1
Figure 3.
Input Panel Connectors

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 17
Signal Ground (J10-10)
Signal Ground (see Figure 4 and Connector Pin Identification on page 14) is an isolated
ground reference for all J10 interfacing signals, and can be used for ConverterPAC
output status signals such as Power Good. This is not the same as Earth Ground on input
power connector J9.
Enable/Disable (J10-1 to J10-8)
The Enable/Disable control pins allow ConverterPAC outputs to be sequenced either
on or o. J10-1 through J10-8 are the control pins for output positions 1 through 8,
respectively (see Figure 5 and Connector Pin Identification on page 14). For DualPACs
and FlexPACs, all outputs are sequenced. In parallel array using VI/VE modules only
the driver ConverterPAC need be controlled. The Enable/Disable pins should be pulled
low to less than 0.7 V with respect to Signal Ground to disable the outputs. They will
sink 10 mA maximum. These pins should be open circuited or allowed to exceed 4.5 V
when enabled. Do not apply more than 6 V to these inputs at any time. If driven from
an electromechanical switch or relay, a capacitor should be connected to eliminate the
eects of switch bounce.
Figure 4.
Interface Connector
12
1110
9
8
7
65
43
2
1
J10
J10-9
J10-10
J10-11
J10-12
Vcc +5V, 0.3A
SIGNAL GROUND
AC POWER OK
GEN SHUTDOWN
J10-1
J10-2
J10-3
J10-4
J10-5
J10-6
J10-7
J10-8
E/D-1
E/D-2
E/D-3
E/D-4
E/D-5
E/D-6
E/D-7
E/D-8
Figure 5.
Enable/Disable and
General Shutdown PFC MegaPAC
1
10
12
Signal Ground
General Shutdown
Enable/Disable Output 1
J10
1
0
TTL "1" (OFF)
TTL "0" (ON)
A TTL "1" applied to the base of the transistor turns
output OFF. Pin 1 (or Pin 12 for GSD) is pulled Low
with respect to Signal Ground. 9Vcc

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 18
Enable/Disable control of Maxi/Mini/Micro Module Arrays
When using the Enable/Disable function on an output that consists of two or more Maxi
modules, it is necessary to connect the E/D pins of the corresponding module locations
together such that both modules are commanded to turn ON or OFF simultaneously.
Example:
Slots 2, 4 and 6 have been configured as a single output parallel array (see Figure 6)
In order to disable the 48 V output, E/D 2, E/D 4 and E/D 6 should be shorted together
as shown in Figure 6. With E/Ds connected together, a single switch can then be used to
remotely enable and disable the output.
**Note: For single output power supply configurations, the simplest method of remotely enabling and
disabling the output is to use the General Shutdown (GSD) function.
General Shutdown /GSD (J10-12)
The GSD control pin on J10-12 allows simultaneous shutdown of all ConverterPAC
outputs (see Connector Pin Identification on page 9). This pin must be pulled down
to less than 0.7 V, and will sink 13 mA maximum to shut down all outputs. The GSD
pin should be open circuited or allowed to exceed 4.5 V when not in use, or when
the outputs are to be enabled. Do not apply more than 6 V to this input at any time.
Normal open circuit voltage is 1.5 to 3 V with respect to Signal Ground. If driven from
an electromechanical switch or relay, a capacitor should be connected to eliminate the
eects of switch bounce.
Figure 6.
Enable/Disable Control
of Maxi Arrays
PZ48V/12.5AN
PZ48V/12.5AJS1
PZ48V/12.5AJS1
Slot# 1
Slot# 2
Slot# 3
Slot# 4
Slot# 5
Slot# 6
Slot# 7
Slot# 8
J1
J10
2
4
6
10
123
Power Factor Corrected
MegaPAC
M5V/40A
M3.3V/40A

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 19
Figure 7.
AC OK Power Fail
AC OK / Power Fail (J10-11)
This is an active high TTL compatible signal and provides a status indication of the AC
input power (see Figure 7 and Connector Pin Identification on page 14). It is capable
of sourcing 0.5 mA at >3.2 V and sink 16mA at < 0.5 V. This signal switches to a TTL “1”
when the high voltage bus exceeds low-line condition during turn-on, and switches
to a TTL “0” 3 ms (minimum) before loss of output regulation due to the loss of input
AC power. This signal can be used to warn external control circuits of an
impending loss of power.
Auxiliary Vcc +5V/0.3A (J10-9)
The Vcc on J10-9 is an auxiliary 5 V regulated power source (see Figure 8 and Connector
Pin Identification on page 14). It is +5 Vdc +/–5% with respect to Signal Ground and can
supply 300 mA maximum. It is short-circuit-proof, but if shorted all outputs will shut
down through the Enable/Disable circuitry. The Auxiliary Vcc typically powers user
circuitry or is used with the Power Good circuitry to provide a pull-up reference for the
outputs of the DC Power Good circuit on a ConverterPAC. If used for this purpose, the
Signal Ground on J10-10 must also be connected to the J3-1 Signal Ground pin
of the ConverterPAC.
10K
Signal Ground
AC Power OK
11
+5V
10
J10
2.49K
PN2222
Figure 8.
Auxiliary Vcc
78M05 Auxiliary Vcc
9
0.1 µF
Signal Ground
J10
10
+5V/300 mA

UG:105 vicorpower.com Applications Engineering: 800 927.9474 Page 20
Power Good (J3-3)
The optional Power Good signal on J3-3 is referenced to Signal Ground on J3-1, and
indicates the status of the output voltage. This signal is asserted a TTL “1” when the
output voltage is above 95% of nominal. It is a TTL “0” when the output voltage is
below 85% of nominal. If the Trim option is also used, the Power Good trip points
DO NOT track with the trimmed voltage. It is possible to trim the output below the fixed
setpoints of the Power Good circuit and cause a negative Power Good signal.
Power Good Inverted (J3-2)
This is the inverse of the Power Good signal and is referenced to Signal Ground on J3-1.
Signal Ground (J3-1)
Signal Ground on J3-1 is an isolated secondary ground reference for J3 status signals. It
is used to provide a reference point for the Power Good circuitry and is not the same as
Earth Ground on input power connector J9.
Vcc In (J3-4)
The Vcc In on J3-4 is an input that requires +5 V either from the J10 Auxiliary Vcc, or
from another source. Input current to this pin is limited by an internal resistor to 3 mA.
If the J10 Auxiliary Vcc is connected to Vcc In on J3-4, then the J10 Signal Ground must
be connected to Signal Ground on J3-1.
+Sense/–Sense - J2-2 and J2-3 (See page 10 and 13 for information on Autosense)
The +Sense on J2-2 should be connected to the +Power Out, and the –Sense on J2-3 to
the –Power Out terminal. Do not reverse or leave the Sense pins open.Sense pins can
be terminated locally at the output of the power supply, in which case the power supply
will provide regulation at the output terminals. The voltage appearing at the load may
drop slightly due to voltage drop in the power cables. If it is necessary to compensate
for voltage drop along the output power cables, this termination should be made close
to the output load. Compensation of up to 0.5 V (0.25 V per lead) can be obtained. Use
twisted pair 22-24 AWG wire for this purpose.
For DualPACs, the +Sense pins are available on connectors designated as J2A-2 and
J2B-2 for outputs A and B, respectively. –Sense pins are on J2A-3 and J2B-3, respectively.
These pins are also duplicated on the power connectors J1A and J1B.
Reminder: Only units with Autosense will automatically operate in Local Sense mode if no sense
connections are made. It will operate in remote sense mode if remote sense connections are made.
Units without Autosense MUST have sense connections (Local or Remote) terminated to their respective
output for the unit to operate properly.
Figure 9.
Power Good and Vcc
Signal Ground
2
Vcc In
4
J3
10K
2.49K
2N2222
2.49K
1
Power Good
3
Power Go
od Inverte
d
ConverterPAC