Shutdown Voltage Help

The NetRS can operate on a DC voltage source of between 11 volts and 36 volts. In addition, the power supply has two DC inputs (primary and secondary) and will automatically switch to the secondary supply when the primary voltage drops too low. The system is designed to operate from battery power sources and will protect those batteries by automatically shutting itself off if both input voltages drop too low. The Shutdown Voltage Control allows you to change the voltage at which part of this protection system activates.

To use the Shutdown Voltage Control effectively, you must know a bit about how the system power supply operates. The voltage level on the higher of the two inputs is compared to three voltage thresholds:

The above thresholds are all subject to an approximate 2% tolerance. The thresholds roughly track each other over changes in temperature and component variances.

As indicated above, the only user controllable voltage threshold is for the Software Shutdown. By default this is set to 10.68 volts, which is 0.25 volts above the Voff voltage. That value (10.68 volts) is the minimum value that the Vshutdown can have. On some systems it may be desirable to initiate a software shutdown at a higher voltage level. The Shutdown Voltage page allows you to enter a new threshold value between 10.68 and 11.4 volts. A Default button is presented to fill in the the form with the original default value. The OK button must be clicked to activate the new threshold.

If the Shutdown Voltage is set lower than both of the current input voltages, an immediate shutdown of the system will occur. If such a situation is detected, a confirmation dialog will be shown. The current input voltages are shown at the bottom of the Shutdown Voltage page. Note that voltage values displayed there are not dynamically updated.


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