Master Lock XR20 Manual de servicio descargar pdf (Pagina 33)

2.5 Controls and Indicators

The controls and indicators XR and XRC Series power supplies are illustrated in figures 2.1 and

2.2, respectively.

2.6 Preparation for Use

2.6.1 Unpacking

Carefully unpack the power supply saving all packing materials and included enclosures.

Inspect power supply for possible shipping damage. Check that there are no broken knobs or

connectors, the external surface is not scratched or dented, the meter faces are not damaged, and

all controls move freely. Any external damage may be an indication of internal damage.

2.6.2 Electrical Check

2.6.2.1 XR Series Models

With the power supply off, disconnect the load, set voltage and current potentiometer controls

full 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. It is recommended that the

following brief electrical check be made shortly after unpacking the supply.

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.

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

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Master Lock XR20 Manual de servicio Pagina 33