KEPCO HSP Series Operator Manual - Manual (Page 28)

3-2 HSPSERIES OPR 050614
c External Voltage Programming: When enabled via S2-3, this mode provides for output
voltage adjustment via an external voltage source (0-10V) connected between pins 18 and
19 (VPROG, -S) of the I/O connector (see Figure 3-2). This technique is useful when imple-
menting digital control of the power supply output voltage via a D/A converter; Kepco's SN/
SNR 488 programmers are ideally suited to these requirements
FIGURE 3-1. EXTERNAL RESISTANCE PROGRAMMING OF OUTPUT VOLTAGE
FIGURE 3-2. EXTERNAL VOLTAGE PROGRAMMING OF OUTPUT VOLTAGE
3.4 OUTPUT VOLTAGE RANGE
The user may select the maximum programmable voltage, either high or low range, via S2
switch positions 1 and 2 (see Figure 2-2). This permits the user to trade adjustment range for
programming resolution; this is especially useful when used in conjunction with external voltage
programming (see PAR. 3.3) for precise output adjustment (±0.2%), or for limiting the maximum
programmable voltage. Operation of range selector is as follows:
a) High Range: This is the factory-set (default) mode; the maximum programmable output
voltage is 110% of nominal V
O
for 3.3V through 28V models, 125% of nominal V
O
for 48V
model.
b) Low Range: When enabled via S2-1,2 the maximum programmable output voltage is
equal to the nominal output voltage V
O
for all models; since the programming resistance
and voltage ranges do not change, the resolution for a given programming input increment
increases by 10% for 3.3V through 28V models, and by 25% for 48V model.
NOTE: When setting the programming range, both S2-1 and S2-2 must be set to the same
position; otherwise, the fault detector voltage window will be offset from the program-
ming value and will not operate properly.
3.5 CURRENT LIMIT PROGRAMMING
HSP power supplies provide two different methods for programming the output current limit
point: internal and external voltage. When using internal programming, the minimum program-
mable current limit is 50-60% of nominal, while external voltage programming permits adjust-