Vicor 4kW MegaPAC-EL AC-DC Switchers - Manual (Page 12)

UG:108 vicorpower.com Applications Engineering: 800 927.9474 Page 12
3 Phase and 4kW MegaPAC-EL “Quick Install” Instructions (Cont.)
Sense Connections
Note: Newer power supplies may have a new feature installed called Autosense. For
units with Autosense, if Remote Sense connections are not made or needed, no Local
Sense selection is necessary - simply connect the output to the load and the unit will
automatically operate in Local Sense. If Remote Sense connections are made, the unit
will operate in a Remote Sense mode. Remote Sense terminals should be terminated to
their respective outputs i.e. - RS to - Output and + RS to + Output. See page 16 for more
information on Autosense.
For units without Autosense, sense connections must always be made. Not
connecting Sense lines to their respective outputs can cause failure to the unit.
Sense Connections on QPACs and Junior QPAC:
n Sense connections do not have to be made if the Local Sense option has been ordered.
(An “L” after the current rating means the Local Sense option has been installed;
e.g., L5 V/40 AL.)
n Use Molex mating receptacle #39-01-0073 and #39-00-0031 terminals provided.
n P2-7 is the +Sense and P2-6 is the -Sense.
n Attach terminals to 22-28 AWG twisted pair wire using Molex tool
#57005-5000.
n Attach opposite end of Sense lines to point where regulation is desired.
n Verify that Sense lines are not cross-connected before applying input power.
Sense Connections on DualQPACs:
n Sense connections do not have to be made if the Local Sense option has been
ordered. (An “L” in the ConverterPAC part number means the Local Sense option has
been installed; e.g. D5 V/20 AL-12 V/4.2 AL.)
n Sense connections are available on the P2 connector or the J1A and J1B
connectors. Either can be used.
n Using J1A, J1B, pin 3 is the +Sense and pin 6 is the -Sense.
n Use Molex mating receptacle #39-01-2060 with #39-00-0039 terminals provided.
n Attach terminals to 18-24 AWG stranded wire using Molex tool #11-01-0197.
n Attach opposite end of Sense lines to point where regulation is desired.
n Verify that Sense lines are not cross-connected before applying input power.
P2 Trim Connection for QPACs and Junior QPAC
n The P2 remote Trim connection should only be used if the local Trim option has not
been installed. (A “T” or an “F” in the ConverterPAC part number means the Trim
option is installed; e.g. M5 V/40 AT.)
n P2-5 provides Trim access.
n Use Molex mating receptacle #39-01-73 with #39-00-0031 terminals provided.
n Attach terminals to 22-28 AWG stranded wire using Molex tool 57005-5000.
+SENSE
POWER GOOD
SIGNAL GROUND
POWER GOOD INVERTED
Vcc IN
2
1
3
TRIM
4
5
-SENSE
7
6
QPAC and Jr. QPAC
Sense Connectors
(OUTPUT CONNECTORS)
1 AND 4 +V OUT
3 3 +R/SENSE 6 -R/SENSE
1
2
J1-A
6
5
4
2 AND 5 -V OUT
3 +R/SENSE 6 -R/SENSE 6
5
4
J1-B
2 AND 5 -V OUT
3
2
(OUTPUT CONNECTORS)
1 AND 4 +V OUT 1
Dual QPAC
Sense Connectors
+SENSE
POWER GOOD
SIGNAL GROUND
POWER GOOD INVERTED
Vcc IN
2
1
3
TRIM
4
5
-SENSE
7
6
Trim Pin Connector
for QPACs and Jr. QPAC
End of Life - Not Recommended for New Designs