TDK Lambda | Z+Low Voltage User Manual

3.8.3 Constant Voltage Check 1. Turn on the output by pressing OUTPUT button so the OUTPUT LED illuminates. 2. Observe the power supply Voltage display and rotate the Voltage encoder. Ensure that the output voltage varies while the Voltage encoder is rotated. The minimum control range is from zero to the maximum rated output for the power supply model. Compare the DVM reading with the front panel Voltage display to verify the accuracy of the Voltage display. Ensure that the front panel CV LED illuminates. 3. Turn off the front panel AC power switch. 3.8.4 Constant Current Check Ensure that the front panel AC power switch is at Off position and the DVM connected to the output terminals shows zero voltage. 1. Connect DC shunt across the output terminals. Ensure that the shunt and the wires current ratings are higher than the power supply rating. Connect a DVM to the shunt. 2. Turn the front panel AC power switch to On position. 3. Turn on the output by pressing OUTPUT button so the OUTPUT LED illuminates. 4. Observe the power supply Current display and rotate the Current encoder. Ensure that the output current varieswhile the Current encoder is rotated. Theminimumcontrol range is from zero to the maximum rated output for the power supply model. Compare the DVM reading with the front panel Current display to verify the accuracy of the Current display. Ensure that the front panel CC LED is on. 5. Turn off the front panel AC power switch. 6. Remove the shunt from the power supply output terminals. 3.8.5 OVP Check Refer to Section 5.3.2 for explanationof theOVP functionprior toperforming the procedure below. 1. Turn the front panel AC power switch to On position and turn on the output by pressing OUTPUT button. 2. Using the Voltage encoder, adjust the output voltage to approx. 10%of the unit voltage rating. 3. Set OVP to 50% of of the unit voltage rating. 4. Adjust the output voltage toward it’s maximum and check that the output voltage cannot be increased more than the OVP setting. 5. Adjust OVP limit to the maximum. 3.8.6 UVL Check The UVL can be set when the power supply output is Enabled (On) or Disabled (Off ). UVL setting values are limited at the maximum level to approximately 5% below the Output Voltage setting. Attempting to adjust the value above this limitwill result inno response to the adjustment attempt. The minimum value setting is zero. 1. Press PROT button. PROT (GREEN) LED illuminates. Current display shows ”  ” message. 2. Press Current Encoder. Voltage Display shows ”  ” message, Current display shows setting level. 3. Rotate the Voltage encoder to set ”  ”. 4. Rotate the Current encoder to adjust the level. 5. Press PROT button twice or wait 15 sec. to return display to its previous state and then PROT LED turns OFF. 6. Adjust the output voltage toward it’s minimum and check that the output voltage cannot be decreased below the UVL setting. 7. Adjust the UVL limit to the minimum.

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