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83
-
507
-
013 Rev. D
47
6.5 RESISITIVE PROGRAMMING OF OUTPUT VOLTAGE AND CURRENT LIMIT
For resistive programming, internal current sources, for Output Voltage and/or Output Current control,
su
p
ply 1mA current through external programmi
ng 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
su
p
ply. Resistance of 0
5Kohm or 0
10Kohm can be selected to program the Output Voltage and
Output Current
from zero to full scale.
A variable resistor can control the output over its entire range, or a combination of variable resistor
and series/parallel resistors can control the output over restricted portion of its range.
Perform the following procedure to
set the power supply to Resistive programming:
1.
Turn the AC On/Off switch to Off.
2.
Set setup switch SW1, positions 1 and 2 to their UP position.
3.
Set SW1, position 3 to select the programming resistor range according to Table 6
-
4.
4.
Set SW1, positions 7 and 8 t
o their UP position, to enable resistive programming mode.
5.
Connect a wire jumper between J1
-
8 and J1
-
12 (refer to Table 4
-
4).
6.
Connect the programming resistors to the mating plug of J1 as shown in Fig.6
-
2.
7.
Set the programming resistors to the desired resis
tance 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 contro
l circuits allow the user to set the Output Voltage and Output Current up to 5% over the
model
-
rated maximum value. The power supply will operate within the extended range, however it
is not recommended to operate the power supply over its voltage and curr
ent 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-
gramming should be stable and low noise resistors, with temperature coefficient of less than
50ppm.
4.
When resist
ive programming is used, front panel and computer control (via serial communication
port) of Output Voltage and Current are disabled.
Table 6
-
4: SW1
-
3 setting and programming range
SW1
-
3 setting
Output Voltage pr
o
gramming
VPGM (J1
-
9)
Output Current progr
amming
IPGM (J1
-
10)
UP
0
-
10Kohm
0
-
10Kohm
DOWN
0
-
5Kohm
0
-
5Kohm
1
14
13
25
10
9
23
22
OUTPUT CURRENT
PROGRAMMING
OUTPUT VOLTAGE
PROGRAMMING
J1 connector, rear panel view
Fig.6-2: Remote resistive programming
PROGRAMMING
RESISTOR
PROGRAMMING
RESISTOR
OPTIONAL SETS
LOWER LIMIT
OPTIONAL SETS
LOWER LIMIT
OPTIONAL SETS
UPPER LIMIT
OPTIONAL SETS
UPPER LIMIT
12
8