Resistive Programming Of Output Voltage And Current Limit - TDK-Lambda Genesys User Manual

7.5.

Resistive Programming of Output Voltage and Current Limit

For Remote Resistive programming, internal current sources, for Output voltage and/or
Output current control, supply 1mA of 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 to 5kOhm or 0 to
10kOhm can be selected to program the Output voltage and Output current limit 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 a restricted portion of its
range.
Perform the following procedure to set the Power Supply to Remote Resistive programming:
a) Turn the AC On/Off power switch to the OFF position.
b) Set SW1-1 to the UP position for Output voltage external programming and SW1-2 to the
UP position for Output current external programming.
c) Set SW1-3 to select the programming resistor range according to Table 7-4.
d) Set SW1-7 and SW1-8 to the UP position to enable the Resistive programming mode.
e) Connect a wire jumper between J1-8 and J1-12 (refer to Table 4-4).
f) Connect the programming resistors to the mating plug of J1 as shown in Fig.7-2.
g) Set the programming resistors to the desired resistance and turn on the AC On/Off power
switch. Then adjust the programming resistances to change the power supply output
level(s).
NOTES:
1. SW1-4, -5, -6 and -9 are not required for remote programming. Their settings can
be determined according to the application requirements.
2. The control circuits allow the user to set the Output voltage and Output current limit
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 outside of its voltage and current rating and performance is not guaranteed.
3. To maintain the temperature stability specification of the Power Supply, the
resistors used for programming should be stable and low noise resistors, with a
temperature coefficient of less than 50ppm.
4. When Remote Resistive programming is used, front panel and computer control
(via the serial communication port) of Output voltage and Output current are
disabled.
SW1-3 setting
UP
DOWN
Table 7-4: SW1-3 Setting and Programming Range (Remote Resistive PGM)
Output Voltage programming
VPGM (J1-9)
0-10kOhms
0-5kOhms
75
83532002 Rev C
Current limit programming
IPGM (J1-10)
0-10kOhms
0-5kOhms