Specifications

PFC MegaPAC-EL and PFC MegaPAC-HPEL “Quick Install”
Instructions (For Mechanical Drawing, see page 12)
Mounting the PFC MegaPAC-EL and PFC MegaPAC-HPEL
* Mount the power supply on any of its four sides.
* Use #8-32 or 4mm mounting screws. Do not exceed a maximum penetration of 0.15"
(3,8mm). The maximum allowable torque is 20 lb-in.
* Maintain 2" (5,1cm) clearance at either end for airflow.
Input Connections
Input Power J9
* Apply input AC power to terminal block J9 using a pressure screw terminal.
* Strip length of AC power conductors to be 0.35 inches.
* Maximum torque is 4.4 lb-in.
* Place a fuse or circuit breaker in the input line for safety reasons.
* Use a maximum wire size of 14 AWG with soldered terminals.
* 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.
Output Connections
Power Connections
Installing ring lugs and/or bus bars on output studs:
* The upper stud is Positive and the lower stud is the Return.
* Newer outputs studs are 1/8th inch longer. See pgs. 12 and 19 for more information.
* Remove nut.
* Place ring lug over output stud.
* Replace and tighten outer nut to a maximum torque of 45 lb-in. Do Not Over-
Tighten Nuts.
* Verify all output nuts are properly installed before turning on supply.
Installing power connectors on DualQPACs (J1A and J1B):
* Use Molex mating receptacle #39-01-2060 with #39-00-0039 terminals provided.
* Pins 1 and 4 are Positive, while pins 2 and 5 are the Return.
* Attach 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 - sim-
ply 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.
Sense Connector J2 (and P2 for the FinQPAC):
* Sense connections do not have to be made if either the Local Sense option was
ordered (older units) or if Autosense is present (see above note on Autosense.)
* Use Molex mating receptacle #50-57-9403 with #16-02-0103 terminals provided.
* J2-2 is the +Sense and J2-3 is the -Sense.
* Attach terminals to 22-24 AWG twisted pair wire using Molex tool #11-01-0208.
* Attach opposite ends of Sense lines to point where regulation is desired.
* Verify that Sense lines are not cross-connected before applying input power.
* For the FinQPAC, P2-7 is the + Sense and P2-6 is the -Sense.
* Use Molex mating receptacle #39-01-0073 with #39-00-0031 terminals provided
* Attach terminals to 22-28 AWG stranded wire using Molex tool #57005-5000.
Pg 10 Vicor 800-735-6200 Westcor Division 408-522-5280 Applications Engineering 800-927-9474 Rev. 6/2004
PFC MegaPAC-EL/PFC MegaPAC-High Power Low Noise
INPUTS
DO NOT
WITHOUT
EARTH
GROUND
L2
115/230 VAC
300VDC
L1
47 TO 500 Hz
OPERATE
NOTE: SET SCREW MAXIMUM
TORQUE = 4.4 INCH POUNDS
LABEL NO: 94-00046 REV B
J2 Pin 1
J3 pin 1 (DC OK Option)
+ Vout
- Vout
Vtrim Pot Adjust (Option)
(OUTPUT CONNECTORS)
1 AND 4 +V OUT
3
3 +R/SENSE 6 -R/SENSE
1
2
J1-A
6
5
4
2 AND 5 -V OUT
3 +R/SENSE 6 -R/SENSE
6
5
4
J1-B
2 AND 5 -V OUT
3
2
(OUTPUT CONNECTORS)
1 AND 4 +V OUT
1
1
2
3
J2 Sense Connector
J2-1 Trim Pin Access
J2-2 +Sense
J3-3 -Sense
Pin
J2
P2 Sense Connector
POWER GOOD INVERTE
D
TRIM
5
3
2
4
1
SIGNAL GROUND
POWER GOOD
Vcc IN
7
6
+SENSE
-SENSE
Input Panel Connectors
Single Output QPAC
DualQPAC Output Connector