Javelin I & II Power Supply Operator’s Manual
Mechanical Considerations
The Javelin can be mounted on either of two surfaces (top or bottom) using standard 8-32 size screws. Maxi-
mum allowable torque is 20 in/lbs., and the maximum penetration is 0.21
(5,33mm).
When selecting a mounting location and orientation, the unit should be positioned so that airflow is not re-
stricted. Maintain a 2
(50,8mm) minimum clearance at both ends of the Javelin, and route all cables so airflow
is not obstructed. The power supply draws air in at the front side and exhausts air out the load/input side. If
airflow ducting is used, avoid sharp turns that could create backpressure. The fan moves approximately 100
CFM of air.
Avoid excessive bending of output power cables after they are connected to the output terminals. For high-
current outputs, use cable ties to support heavy cables and minimize mechanical stress on connectors. Be care-
ful to not short out to neighboring outputs. The maximum torque recommended on output nuts is 130 in/lbs.
Javelin Do’s and Don’ts
Run the output (+/
) power cables next to each other to minimize inductance.
Insert proper fault protection at power supply input terminals (i.e., a fuse).
Use proper size wires to avoid overheating and excessive voltage drop.
Do not attempt to repair or modify the power supply in any manner.
Do not restrict airflow to the unit.
The cooling fan draws air into the front of the unit and forces it out at
the input/output terminal (rear) side. It is necessary to provide at least 100 CFM of cooling airflow for the
Javelin II.
Rev. 05/11/2012 Mission Power Solutions (760) 631-6846 [email protected] Pg. 8
Connecting Javelin I & II Power Supplies in Parallel
To connect up to three Javelin Power Supplies in parallel, connect PR1 (J3-9) to corresponding PR1(s) (J3-9)
and PR2 (J3-4) to corresponding PR2(s) (J3-4). Use 20-24 AWG twisted pair, shielded hook-up cable with the
shield connected to each unit’s chassis ground (J3-9). All units must use equivalent power sources, and all
outputs must be connected to a common bus with equal impedance connections. Output voltage can be ad-
justed on one power supply provided the other unit(s) is/are adjusted completely counterclockwise. If Remote
Sense is used, all units must have a connection to the point of regulation using 20-24 AWG twisted pair wires.
Figure 5. Paralleling Javelin I and II Power Supplies
AC/DC
Input
Twisted Pair Remote Sense Wires
Power
Supply 1
Power
Supply 2
Power
Supply 3
Shielded, Twisted Pair
Paralleling Cable
Output Cables
Output Bus
Output Return Bus
+
+
+
–
–
–
J3
J3
J3
