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AMREL SPS-A Series
REMOTE CURRENT PROGRAMMING
3.4
Remote current programming is used for applications that require the
output current be programmed (controlled) from a remote source. An
external resistance or external voltage source may be used as a
programming device.
When using remote current programming, a shielded, twisted-pair,
hookup wire is recommended to prevent noise interference with
programming signals.
3.4.1 REMOTE CURRENT PROGRAMMING USING RESISTANCE:
The resistance coefficient for remote current programming is 5k
ohms/100% rated output with respect to terminal J1-23 (IP RTN). The
programming current from terminal J1-22 (IP RES) is factory set for 1
milliampere. This yields a coefficient of 1.0% of rated output current for
each 50 ohms. If multiple switches or relays are used to program
different levels, make-before-break contacts are recommended.
Note: If an external resistance is used for remote programming, the
current programming return (IP RTN), terminal J1-23, must be connected
directly to or within ±3 volts of the power supply common terminal, J1-24.
See Figure 3-9 for connection requirements.
Figure 3-9. Remote Current Programming Using Resistance
M550129-01 Rev A
Operation
3-17
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