7.0Test Set-Up
7.1Initial Set-Up
1)Examine the part number of the power module to determine of the unit is defined for positive or negative logic enable as follows:
S48SS3R304NR would denote negative logic, while S48SS3R304PR would denote positive logic (S48SS only).
2)If the power module has positive logic, switching SW1 to position HI or floating will enable the power converter. Switching SW1 to position Low will disable the power converter.
3)If the power module has negative logic, switching SW1 to position Low will enable the power converter. Switching SW1 to position HI or floating will disable the power
converter.
4) Multimeters (1) Multimeters (2 and 3)
5) Scope Timebase Trigger
Channel (1) Volts / Div Coupling
Channel (2)
Volts / Div
Coupling
6)Electronic Load
Turn on the Electronic Load and adjust the current level. The total output current is 4.5A (15W) for the S48SR power module and 4.5A (15W) for the S48SS power module. Ensure the output load does not exceed the recommended maximum current.
7)SW2 is used for trimming the output voltage. Turn SW2 to the OFF position if the function is not being used. Turn SW2 to the UP position if trimming up is required. Turn SW2 to the DOWN position if trimming down is required.
7.2Initial Power Up
1)Turn the Power Supply on and increase the input voltage (use DVM2 to monitor the voltage) until it reaches 48V (or the desired value).
2)Toggle SW1 to the appropriate logic position to turn the power module on (S48SS only).
3)The converter is now operating, which can be verified by observing the DVM3 (approximately 3.3V.) and Channel 2 of the oscilloscope (+3.3V output).
4