83
-
5
15
-
0
00
Rev.
B
48
1
14
13
25
10
9
23
22
CURRENTLIMIT
PROGRAMMING
OUTPUTVOLTAGE
PROGRAMMING
J1 connector,rear panel v iew
Fig.6-2: Remote resistive programming
PROGRAMMING
RESISTOR
PROGRAMMING
RESISTOR
OPTIONALSETS
LOWERLIMIT
OPTIONALSETS
LOWERLIMIT
OPTIONALSETS
UPPERLIMIT
OPTIONALSETS
UPPERLIMIT
12
8
6.5
RESISITIVE PROGRAMMING OF OUTPUT VOLTAGE ANDCURRENT LIMIT
For resistive programming, internal current sources, for Output Voltage and/or Output Current control,
su
p
ply 1mA current through external programming resistors connected between J1
-
9 & 22 and J1
-
10
& 23. The voltage across the programming resistors is used as a programming voltage for the power
supply. Resistance of 0
5Kohm or 0
10Kohm can be selected to program the
o
utput
v
oltage and
o
utput
c
urrent from zero to full scale.
A variable resistor can
control the output over its entire range, or a combination of variable r
e
sistor
and series/parallel resi
s
tors can control the output over restricted portion of its range.
Perform the following procedure to set the power supply to Resistive programming:
1.
T
urn the AC On/Off switch to Off.
2.
Set setup switch SW1
-
1 to its UP position for output voltage external programming and SW1
-
2 to
its UP position for Output Current limit external programming.
3.
Set SW1, position 3 to select the programming resistor range acco
rding to Table 6
-
4.
4.
Set SW1
-
7 to its UP position for output voltage resistive programming and SW1
-
8 to its UP pos
i-
tion for Output Current limit resistive programming.
5.
Connect a short between J1
-
8, J1
-
12 and J1
-
23 (refer to Table 4
-
4).
6.
Connect the programm
ing resistors to the mating plug of J1 as shown in Fig.6
-
2.
7.
Set the programming resistors to the desired resistance and turn the power supply ON. Adjust the
resistors to change the power supply output.
NOTES:
1.
SW1, positions 4, 5, 6 and 9 are not required
for remote programming. Their settings can be d
e-
termined according to the application requirements.
2.
The control circuits allow the user to set the Output Voltage and Output Current up to 5% over the
model
-
rated maximum value. The power supply willoperate
within the extended range, ho
w
ever it
is not recommended to operate the power supply over its voltage and current rating and perfor
m-
ance is not guaranteed.
3.
To maintain the temperature stability specification of the power supply, the resistors used for pr
o-
g
ramming should be stable and low noise resistors, with temperature coefficient of less than
50ppm.
4.
When resistive programming is used, front panel and computer control (via serial communication
port) of Output Voltage and Current are disabled.
SW1
-
3 settin
g
Output Voltage pr
o
gramming
VPGM (J1
-
9)
Output Current programming
IPGM (J1
-
10)
UP
0
-
10Kohm
0
-
10Kohm
DOWN
0
-
5Kohm
0
-
5Kohm
Table 6
-
4: SW1
-
3 setting and programming range