REMOTE INHIBIT/REMOTE RESET CONTROLS
Operation of the output regulator can be inhibited remotely via either one of two TTL-level control lines, RC1 and RC2. Both of these signals are isolated from both the input and output, allowing single-point control of several power supplies operating at different potentials. Both positive and negative logic are supported.HSP power supplies incorporate two TTL-level inputs, RC1 and RC2, accessed via the I/O connector, which can be used to disable the output regulator via external stimulus. These two controls operate from an internal 5V supply (5VAUX) which is isolated from both input and output, creating a "floating" inhibit control circuit which allows the user to control several HSP power supplies operating at different return potentials from a single source. The two control lines differ in that RC1 (pin 8) is normally high, initiating an output inhibit with application of a low signal level, while RC2 (pin 7) is normally low and requires application of a high level signal to inhibit the output; both of these signals are applied with respect to AUXRTN, and can be operated at potentials as much as ±500V from the HSP output(s).
These two signal levels are TTL-compatible, both for voltage levels and source/sink capability. If not actively driven, these signals have no effect on power supply operation. Activation of either one of these control lines results in an immediate shutdown of the output PWM regulator, including reset of the soft-start, undervoltage, and current walk-in circuits. Operation is inhibited until the appropriate control line is released, whereupon the power supply output restarts as from initial cold turn-on.
