Vicor Javelin III User Manual
Page 8
Javelin III Power Supply Operator’s Manual
Rev. 05/11/2012 Mission Power Solutions (760) 631-6846 [email protected] Pg. 8
Mechanical Considerations
The Javelin III can be mounted on either of two surfaces (top or bottom) using standard 8-32 size screws.
Maximum allowable torque is 20 in/lbs., and the maximum penetration is 0.21 in. (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 III, 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 3 fans move approxi-
mately 270 to 300 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. The
maximum torque recommended on output bolts and nuts is 10 ft/lbs.
Javelin III 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 or circuit breaker).
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 fans draw air into the front of the unit and force it out at
the input/output terminal (rear) side.
DC OK/DC OK′ (J1-7 and J1-8)
DC OK and DC OK′ are logic signals provided to indicate with either TTL logic “1” or “0” that the correct
output voltage is available. DC OK (J1-7) is a logic “1” when output voltage is within specification and a logic
“0” when output is out of tolerance. A logic “0” is capable of sinking 16 mA in either circuit. The inverse
signal, DC OK′, is available at J1-8. The circuit is operated with a +5Vcc provided by either the customer or
taken from J1-2 (+5V Vcc) and J1-1 (+5V Return).
Figure 5. DC OK Circuit
MOC217
J1-6 +5V Vcc
J1-8 DC OK’
J1-7 DC OK
J1-15 +5V Return
2N7002
2N7002
49.9K
4.99K
4.99K
DC OK