KEPCO RKW 300W Series Operator Manual - Manual (Page 9)

RKW 300W 060110
7
Sense terminals with a precision voltmeter and turn the voltage control to the desired operating
value. Refer to Table 1 for the recommended Adjustment Range of all the RKW 300W Models
3.2 REMOTE VOLTAGE CONTROL
The unit is shipped with a shorting link in place between RV and REF terminals. Removal of this
link allows the output voltage to be adjusted by either a trimmer pot (resistance) or by an external
variable voltage source across the RV terminal and –S terminal.
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
Use either local sensing (PAR. 5.1) or remote sensing (PAR. 5.2). If remote sensing is used, the
impedance of the load wires connecting the power supply to the load should be the same. It is pos-
sible that the overvoltage protection may be triggered if the output voltage is decreased to a low
level very quickly (using either the Vadj pot or the RV terminal) when the power supply is at a low
load condition.
RESISTANCE: Use a shielded wire 6.6 feet (2M) maximum in length, for connection (of REF, RV,
and –S terminals) to the trimmer control. Connect the external trimmer as shown in Figure 5 (A).
Suggested value for the trimmer control is 5K ohms). With the external trimmer control at its max
imum clockwise position, set the output voltage to the desired maximum value by adjusting Vadj
clockwise. The value should range from 0 to 120% of Eo nominal (from 0 to 110% for the 48-volt
model, and for the 3-volt model). The remote voltage control may not be able to go down to zero
volts because of the residual resistance of the potentiometer (could be about 10%).
VOLTAGE. By adjusting an external 0-6V voltage source (0-5.5V for the 48-volt model) from mini-
mum to maximum, the maximum output voltage can be adjusted from 0 to 120% (V) (for the 3.3 volt
and 48 volt models 110%). Remove the shorting link between the REF and RV terminals. Connect
the voltage source across the RV and (–)S terminals as shown in Figure 5 (B).
FIGURE 5. CONNECTIONS FOR REMOTE VOLTAGE CONTROL
3.3 REMOTE TURN ON-TURN OFF
When input source power is ON, the output may be turned ON or OFF with the remote control fea-
ture using the ±RC terminals (see Figure 4). These terminals accept a logic level (2.4V to 24V
"high" and 0.0 to 0.4V "low"), or a contact closure. When the ±RC terminals are open, using either
a mechanical switch or a high level logic signal, the RKW 300W output is cut OFF. When the RC
B A