TEXIO PU100-7.5, Instruction Manual

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6.5. RESISTIVE PROGRAMMING OF OUTPUT VOLTAGE AND CURRENT LIMIT
For resistive programming, internal current sources, for output voltage and/or output current control,
supply 1mAcurrent through external programming resistors connected between J1-9 & 22 and 1-10 &
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 output voltage and
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 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 programming resistor range according to Table 6-4.
4. Set SW1 positions 7 and 8 to their UP position to enable resistive programming mode.
5. Connect a short between J1-8 and J1-12 (refer to Table 4-4).
6. Connect the programming resistors to the mating plug of J1-22(VPGM_RTN),J1-23(IPGM_RTN)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 setting can be
determined according to the application requirements.
2. The control circuits allow the user to set the output voltage and 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 over 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 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.
Table 6-4: SW1-3 setting and programming range
SW1-3 setting
Output Voltage programming
VPGM (J1-9)
Current limit programming
IPGM (J1-10)
UP 0-10kΩ 0-10kΩ
DOWN 0-5kΩ 0-5kΩ
J1 connector, rear panel view
Fig.6-2: Remote resistive programming