KEPCO RCW 350W Series - Manual (Page 11)

RCW350W 120607
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3.5 REMOTE VOLTAGE CONTROL
The use of the RV terminal allows the output voltage to be adjusted by a trimmer pot or by an exter-
nal source.
Use a shielded wire, 2m maximum in length, for connection to the trimmer control. Maintain the
shorting link between the (+) S and (+) M terminals, and between the (-) S and (-) M terminals,
and connect the external trimmer between the REF, RV, and (-) M and (-)S terminals (with the cen-
ter lead of the trimmer going to the RV terminal,see Mechanical Outline Drawing of the RCW 350W
Power Supply, Figure 1). Suggested value for the trimmer control is 5K ohms (see Figure 7). With
the external trimmer control at its maximum clockwise position set the output voltage to the
desired maximum value by adjusting the Vadj clockwise. The value should not be more than
110% Eo nominal.
By using an external 0-5.5V voltage source the maximum output voltage can be adjusted from 0 to
110%. For voltage source use remove the shorting link between the REF and RV terminal. Connect
the voltage source across the RV and (–)S terminals. The impedance of the load wires connecting
each power supply to the load should be the same when using remote sensing with this configura-
tion. It is possible that the overvoltage protection may be triggered if the external programming volt-
age source is changed very quickly when the power supply is at a low load condition
By adjusting the external control from minimum to maximum, the output voltage will change from
minimum to maximum value (0 to 110% of Eomax).
NOTE: Specifications are met when voltage is within adjustment range in Table 1. If remote
voltage control is not implemented, the shorting link between RV and REF must be in
place:
FIGURE 7 CONNECTIONS FOR REMOTE VOLTAGE CONTROL OF THE RCW 350W POWER SUPPLY
VOLTAGE CONTROL
BY EXTERNAL
PROGRAMMABLE SOURCE
VOLTAGE CONTROL
BY TRIMMER