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Kepco Power Solutions
718-461-7000

VOLTAGE CHANNEL

Output voltage is controlled continuously throughout the specified adjustment range via a 10-turn potentiometer mounted behind the front panel. External control can be exercised either by resistance or by control voltage.

Output Voltage Programming: HSP power supplies provide three different methods for programming the output voltage regulation point: internal, external resistance and external voltage. When using either internal or external resistance programming, the minimum programmable voltage is 50-60% of nominal, while external voltage programming permits adjustment down to zero. Performance specifications are only guaranteed over the range shown in the Models table. The programming method is selected via S2 switch positions 3, 4 and 5 as follows:

NOTE: One programming mode must be selected, or the HSP output voltage programs to zero; never select more than one programming mode at a time.

VOLTAGE CHANNEL PROGRAMMING METHOD
Internal Programming: This is the factory-set (default) mode; when enabled via S2-5, the output voltage is adjusted via the front panel potentiometer labeled "VO."
External Resistance Programming: When enabled via S2-4, this mode provides for output voltage adjustment via an external resistance or potentiometer (0-50K Ohms) connected between pins 17 and 35 (VRP1, VRP2) of the I/O connector. This technique is useful for applications where the voltage output of the power supply must be locked to a preset value without means of adjustment (security), or where the voltage output of the power supply must be remotely adjusted after installation (convenience).
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. This technique is useful when implementing 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.

Output Voltage Range: The user may select the maximum programmable voltage, either high or low range, via S2 switch positions 1 and 2. This permits the user to trade adjustment range for programming resolution; this is especially useful when used in conjunction with external voltage programming for precise output adjustment (0.2%), or for limiting the maximum programmable voltage. Operation of range selector is as follows:

  • High Range: This is the factory-set (default) mode; the maximum programmable output voltage is 110% of nominal VO for 3.3V through 28V models, 125% of nominal VO for 48V model and 112% of nominal VO for 125V model.

  • Low Range: When enabled via S2-1,2 the maximum programmable output voltage is equal to the nominal output voltage VO 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, by 25% for 48V model and by 12% for 125V model.

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KEPCO, INC. • 131-38 SANFORD AVENUE • FLUSHING, NY. 11355 U.S.A.
TEL (718) 461-7000 • FAX (718) 767-1102
www.kepcopower.com • email: hq@kepcopower.com