Vicor Javelin III - Manual (Page 7)

Javelin III Power Supply Operator’s Manual
Figure 5. Auxiliary Vcc
Rev. 05/11/2012 Mission Power Solutions (760) 631-6846 [email protected] Pg. 7
Signal Return (J1-1, 9)
Signal Return on J1-1 & 9 is an isolated secondary ground reference for all J1 interfacing signals.
Inhibit/Enable (J1-10 & J1-11)
The Inhibit/Enable control pins allow the output to be controlled with either “inhibit” or “enable” logic. Con-
necting Inhibit (J1-11) and Enable (J1-10) to ground causes the Javelin III to operate. With Inhibit (J1-11)
open, the Javelin III will operate, and the Enable pin has no effect. Connecting Inhibit to ground and leaving
Enable open will disable the output of the Javelin III. Refer to Table 2 (Pg. 3).
AC OK (J1-3)
AC OK is an active high TTL-compatible signal and provides a status indication of the AC input power. It is
capable of sinking 16 mA maximum. This signal switches to a TTL “1” when the high voltage bus exceeds
low-line condition during turn-on. Upon loss of input power, the bus voltage will drop, causing the AC OK
signal to go low. A minimum of 3 ms holdup time is provided for a 3600W load following the loss of the AC
OK signal.
Figure 3. AC OK Output Circuit
Auxiliary Vcc +5V/0.3A (J1-2)
The Vcc on J1-2 is an auxiliary 5V regulated power source. It is +5VDC +/−5% with respect to Signal Return
(J1-1 or J1-9) and can supply 300 mA maximum. It is short-circuit proof, but if shorted, all outputs will shut
down through the Inhibit/Enable circuitry.
Figure 4. Auxiliary Vcc
Remote Sense
The Javelin III is shipped from the factory with Auto-Sense installed. If Remote Sense is desired, sense leads
must be connected from J1-13 (+sense) and J1-14 (–sense) to the load point where regulation is required.
When Auto-Sense is used, the power supply will regulate the output at the output terminals. The voltage ap-
pearing at the load may drop slightly due to voltage drop in the power cables. If it is necessary to compensate
for voltage drop along the output power cables, the output can be configured for Remote Sense. Use stranded,
twisted pair 20-24 AWG wire for the Remote Sense lines. Remote Sense can compensate for a voltage drop of
up to 0.5V, or 0.25V on each leg. For trim capabilities, consult Mission Power Solutions’ Engineering Depart-
ment.
+5V
AC OK 2.5K
J1-3 AC Power OK
J1-1 Signal Return
PN2222
+5V/300mA
78M05
0.1uF
J1-2 Auxiliary Vcc
J1-1 Signal Return