TDK-Lambda Genesys User Manual

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Contents

TDK-Lambda Genesys User Manual Manual pdf 61 page image

5583532002 Rev C5.2.2. Constant Current Modea) In Constant-Current mode, the Power Supply regulates the Output current at theselected value, while the voltage varies with the load requirement.b) While the Power Supply is operating in Constant-Current mode, the CURRENTLED on the front panel is illuminated.c) Adjustment of the Output current can be made when the power supply output isenabled (Output On) or disabled (Output Off). Disabled Output (Off): Press the PREV button and then rotate the Currentencoder knob. The CURRENT meter will show the programmed current for 5seconds after the adjustment has been completed. Then the VOLTAGE meterwill display “OFF”. Enabled Output (On) with Power Supply in Constant-Voltage mode: Press thePREV button and then rotate the CURRENT encoder knob. The CURRENTmeter will show the programmed current limit for 5 seconds after theadjustment has been completed, and will then return to show the actualOutput current. Enabled Output with Power Supply in Constant-Current mode: Rotate theCURRENT encoder knob to adjust the current limit.d) Adjustment resolution can be set to Coarse or Fine adjustment. Press the FINEbutton to select between Coarse and Fine resolution. The FINE LED turns Onwhen the resolution is set to FINE.5.2.3. Automatic CrossoverIf the Power Supply operates in Constant-Voltage mode, while the load current isincreased to greater than the Output current limit setting, the Power Supply willautomatically switch to Constant-Current mode. If the load is decreased to less thanthe Output current limit setting, the power supply will automatically switch back toConstant-Voltage mode.5.3. Over Voltage Protection (OVP)The OVP circuit protects the load in the event of a remote or local programming error or aPower Supply failure. The protection circuit monitors the voltage at the power supplysense points thus providing the protection level at the load. Upon detection of an Over-Voltage condition, the power supply output will shut down.5.3.1. Setting the OVP LevelThe OVP can be set when the Power Supply output is Enabled (On) or Disabled (Off).To set the OVP level, press the OVP/UVL button, so that the CURRENT meter shows“OUP”. The VOLTAGE meter shows the OVP setting level. Rotate the VOLTAGEencoder knob to adjust the OVP level. The display will show “OUP” and the settingvalue for 5 seconds after the adjustment has been completed and will then return toits previous state.To preview the OVP setting, press the OVP/UVL pushbutton so that the CURRENTdisplay will show “OUP”. At this time, the VOLTAGE display will show the OVPsetting. After 5 seconds, the display will return to its previous state.The minimum setting level is approximately 105% of the set Output voltage. Themaximum setting levels are shown in Tables 8-8 and 8-11.