UG:003

vicorpower.com

Applications Engineering: 800 927.9474

Page 2

Please take a closer look at the PRM-CB board.

Figure 1 is a picture of a PRM-AL mounted to the PRM-CB board.

The board has several features that enable the user to fully explore the capabilities of the PRM-AL:

1

Source voltage input points are designed to accommodate #10 hardware and Panduit ring lugs.

BE CERTAIN THAT THE POLARITY IS CORRECT BEFORE APPLYING POWER.

2

Auxiliary control (H01) - access points for PR, IL, TM, PC, and VH, (header shown installed).

3

Reference test point Signal Ground (SG).

4

Adjustment potentiometers for indicated function are used in conjunction with actuation of

corresponding switch in Item 5.

5

PRM port connections (switch bank and silk screen reference).

a. Toggling the switch indicated PC to the ON position inhibits the PRM output.

b. Toggling the switch indicated IL to the ON position enables an adjustable current limit effected

by varying the corresponding IL trim pot (Item 4).

c. Toggling the switch indicated SC to the ON position enables adjustment of the output voltage

down from the set point determined by the OS resistor by varying the corresponding SC trim

pot (Item 4). - CAUTION: depending upon the initial output voltage set point determined by

the OS resistor it is possible to trim the SC so low that the output shuts off. The minimum

output voltage per the data sheet is 26 Vdc.

d. Toggling the switch indicated CD to the ON position places the PRM in Adaptive Loop

regulation mode (for use with the VTM-CB) from the Local Loop regulation mode. (In Local

Loop mode the set voltage is regulated at the output terminals of the PRM.) Adjusting the

corresponding CD trim pot (Item 4) changes the gain of the loop to compensate for different

OS settings and/or interconnect resistive losses.

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.

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4

5

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9

Figure 1

PRM-AL mounted

to PRM-CB board