Vicor PFC MegaPAC-HPEL Power Factor Corrected AC-DC Switchers - Manual (Page 15)

UG:119 vicorpower.com Applications Engineering: 800 927.9474 Page 15
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 0 .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 15 A rating at
the power supply input is required for safety agency compliance. It should be sized to
handle the start-up inrush current of 25 A 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 (M2) 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 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.
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. (NEVER disconnect the +Out
and -Out load wires while the supply is operating as disconnecting WILL cause damage
to the power supply.) 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 or if the Local Sense option
is specified (old units). 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.
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