Specifications
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 17A at 115 Vac
and 34A at 230 Vac.
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 effects. 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 imped-
ance 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.
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-EL and PFC MegaPAC-HPEL 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.
Signal Ground (J10-10)
Signal Ground (see Figure 4 and Connector Pin Identification on page 9) 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.
Rev. 6/2004 Vicor 800-735-6200 Westcor Division 408-522-5280 Applications Engineering 800-927-9474 Pg. 13
PFC MegaPAC-EL/PFC MegaPAC-High Power Low Noise
INPUTS
DO NOT
WITHOUT
EARTH
GROUND
L2
115/230 VAC
300VDC
INPUT CONNECTIONS
J9-1 EARTH GROUND
J9-2 L2-NEUTRAL
J9-3 L1
L1
47 TO 500 Hz
OPERATE
47 TO 500 Hz
300VDC
115/230 VAC
L2
INPUTS
L1
OPERATE
GROUND
EARTH
WITHOUT
DO NOT
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
J10
Figure 3. Input Panel Connectors
12
1110
9
8
7
65
43
2
1
J10
J10-9
J10-10
J10-11
J10-12
Vcc +5V, 0.3A
SIGNAL GROUN
D
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 4. Interface Connector