UG:003

vicorpower.com

Applications Engineering: 800 927.9474

Page 3

e. Toggling the switch indicated OSV (OS Variable) to the ON position requires the

switch indicated OSF (OS Fixed) be placed in the OFF position and allows the

PRM® output set point to be varied within the range specified on the data sheet.

f. Toggling the switch indicated OSF to the ON position sets the output of the PRM

to the nominal value indicated on the data sheet. If this switch is in the OFF

position and the OSV switch is also OFF, the unit will not function.

g. IT IS BEST TO SET THE SWITCH POSITION AND CORRESPONDING TRIM POT

SETTINGS BEFORE APPLYING POWER TO THE BOARD.

6. Test point for Secondary Control (SC).

7. Output voltage points are designed to accommodate #10 hardware and

Panduit ring lugs.

8. Output connector (J01) for mating with VTM-CB providing Vout and VC. As shown

on the schematic (Figure 2) there are four pins dedicated to the + Out, four for the

-Out, and two for the VC. Each contact is rated for 3 A. The excess capacity afforded

by these pins can facilitate testing multiple VTM-CBs from a single PRM-CB using an

appropriate wiring harness and mating connector. This may also be achieved using

the large pads of Item 7.

9. Output scope jack (J02). Headers H01 and J01 are 0.100" spacing, 10 position female,

manufactured by Sullins Electronics and available from Digi-Key as part # S5519-ND.

Figure 2.

PRM-CB schematic diagram