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Page 11
Interface Connections
Chassis Input Power Terminals (J9)
Input DC power is applied to solderless lugs J9, using a wire size of 2AWG. J9-1 is the +DC Voltage
IN connection, and J9-3 is the –DC Voltage IN connection. The Earth Ground is accessed via J9-2, a
size 10-32 self-locking PEM nut. Maximum torque recommended is 25lb.in. A fault clearing device,
such as a fuse or circuit breaker at the power supply input is strongly recommended. For an output
of 1600 watts with operation on 48V
DC
(and low line operation of 42 volts), a fast-blow fuse of 50
amps is recommended. Start up inrush current is limited by a thermistor and in most cases will be less
than nominal line current during operation. Start up inrush current can be calculated by I = MaxV
IN
/10
(where Max V
IN
is the high line operating voltage. See Table 1). Example: for a nominal 48V input, the
maximum operating voltage is 76; therefore, I = 76V/10 = 7.6 amps.
Note:
A fault clearing device, such as a fuse or circuit breaker at the power supply input is required per safety agency
conditions of acceptability.
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 six-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.
/–Sense Connections (J2 for Single Output, or J2A/J2B for Dual Outputs)
Although all outputs are open-Sense protected, the +/–Sense terminals MUST be connected to their
respective outputs before the DC 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
™
, BatPACs
™
, or if the
Local Sense option is specified. Sense pins can be accessed on J1A/J1B or J2A/J2B on dual output units.
Signal Ground (J10-1, 2, 12, 15)
Signal Ground (Connector Pin Identification on Page 11) 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.
Figure 3
Input Panel Connectors
DC
+
DC
–
