3.8. Electrical Check

This section describes the electrical checkout procedure for the XR Series MagnaDC power supply. This brief electrical checkout procedure validates the product’s power circuitry and safety features. This procedure should be followed upon receipt of the product and before it is placed into use.

The electrical check for models with the C Version front panel requires use of the RIS Panel software described in Computer Programming. With the software installed and the power supply connected to the desired communications interface, select the appropriate equivalent front panel in the Configuration Setup Panel. Select the Virtual Control Panel in the View Menu to display the virtual XR Series front panel. Follow the procedure below using the Virtual Control Panel from within the RIS Panel software.

With the power supply off, disconnect the load, set the voltage and current controls to minimum (fully counterclockwise), and set the over voltage trip and over current trip settings to maximum. Connect the power supply to a suitable source of AC voltage. For this test, only 50% of rated AC current is required. Turn the power switch on and observe the indicator lights going through the startup routine. After initialization, the following indicator lights should be on: STANDBY, INT CTL, EXT CTL, and ROTARY. This is the default configuration from the factory.

Maximum Voltage, Open-Circuit

Press the start switch and advance the current control one turn clockwise. The power and voltage control indicators should light. Increase the voltage set point to maximum and then to minimum. DC voltage should increase smoothly from minimum to maximum to minimum as indicated on the meter. Return the voltage control full counterclockwise. Press the stop switch.

Over Voltage Trip, Open-Circuit

To check over voltage trip, press the menu key. This places the power supply in data entry mode to set over voltage trip. Using the up/down arrow keys, enter an over voltage trip set point at half the rating of the power supply. Once the over voltage trip set point has been entered, press the enter key to save the information.

Press the start switch and slowly increase the voltage set point. Over voltage trip should operate at the over voltage trip set point. The over voltage trip (OVT) indicator should turn on, the power and voltage control indicators should turn off, and the supply should shut down. Press the clear key. Now set the over voltage trip set point to maximum which is 110% the full scale rating of the power supply. Again start the supply and observe that the power supply operates normally. With the main power disconnected, connect a short to the power output terminals on the rear panel. Reconnect the main power, set voltage and current controls full counterclockwise, and turn the power switch on.

Maximum Current, Short-Circuit

With the main power disconnected, connect a short across the output terminals of the power supply. Reconnect the main power, set voltage and current controls full counterclockwise and turn the power switch on.

Press the start switch and advance the voltage control one turn clockwise. Increase the current set point to maximum and then to minimum. The power and current control indicators should light. DC current should increase smoothly from minimum to maximum to minimum as indicated on the meter. Return the current control full counterclockwise. Press the stop switch.

Over Current Trip, Short-Circuit

To check over current trip, press the menu key and then the item key one time. This places the power supply in data entry mode to set over current trip. Using the up/down arrow keys, enter an over current trip set point at half the rating of the power supply. Once the over current trip set point has been entered, press the enter key to save the information.

Press the start switch and slowly increase the current set point. Over current trip should operate at the over current trip set point. The over current trip (OCT) indicator should turn on, the power and current control indicators should turn off, and the supply should shut down. Press the clear key. Now set the over current trip set point to maximum which is 110% the full scale rating of the power supply. Again start the supply and observe that the power supply operates normally.

If any of these events do not occur, the supply is defective and should not be operated. Depending on the circumstances, either warranty service or troubleshooting is required.