Vicor Autoranging MegaPAC AC-DC Switcher - Manual (Page 14)

UG:106 vicorpower.com Applications Engineering: 800 927.9474 Page 14
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 10 AWG. The maximum torque recommended is 10
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) is the Hot connection; J9-3 (L1/N) is the
other Hot or input Neutral connection.
A fault clearing device, such as a fuse or circuit breaker at the power supply input is
required per safety agency conditions of acceptability. It should be sized to handle the
start-up inrush current.
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 J1B. 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 (See
page 9 for additional information on Autosense)
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.
For units without 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
Autoranging MegaPAC is 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 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.
FROM 47 TO 500 Hz
L1/N
RANGING
200-240 VAC
100-120 VAC
L2
HERE.
GROUND
EARTH
RUN W/O
DO NOT
MAX TORQUE ON SET SCREWS - 10 IN LBS
AUTO-
AC INPUTS
OPERATING
AC SOURCE
SINGLE PHASE
TED TO ANY
BE CONNEC-
SUPPLY CAN
THIS POWER
NOTE
J10 (PIN 1)
J9-3 AC NEUTRAL
J9-2 AC HOT
J9-1 EARTH GROUND
INPUT CONNECTIONS
J9
Figure 3.
Input Panel Connectors
End of Life - Not Recommended for New Designs