TDK-Lambda Genesys User Manual

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TDK-Lambda Genesys User Manual Manual pdf 63 page image

5783532002 Rev C5.5.2. Resetting Activated Foldback ProtectionThere are four methods to reset an activated Foldback protection.a) Press the OUT button. The Power Supply output is enabled and the Outputvoltage and Output current will return to their last settings. In this method, theFoldback protection remains armed; therefore if the load current is higher than theOutput current limit setting, the Foldback protection will be activated again.b) Press the FOLD button to cancel the Foldback protection. The Power Supplyoutput will be disabled and the VOLTAGE display will show “OFF”. Press the OUTbutton to enable the Power Supply output.c) Turn the Power Supply output Off and then On using the SO control (Refer toSection 5.7). In this method the Foldback protection remains armed, therefore ifthe load current is higher than the Output current limit setting the Foldbackprotection will be activated again.d) Turn the Power Supply Off using the AC On/Off switch, wait until the front paneldisplay turns Off, then turn the unit back ON again by pressing the AC On/Offswitch to the On position. The Power Supply output is enabled and the Outputvoltage and Output current will return to their last setting. In this method, theFoldback protection remains armed. Therefore, if the load current is higher thanthe Output current limit setting, the Foldback protection will be activated again.5.6. Output ON/OFF ControlThe Output On/Off enables or disables the Power Supply output. Use this function tomake adjustments to either the power supply or the load without shutting off the ACOn/Off switch. The Output On/Off can be activated from the front panel using the OUTbutton or from the rear panel J1 connector. The OUT button can be pressed at any timeto enable or disable the Power Supply output. When the output is disabled, the Outputvoltage and Output current fall to zero and the VOLTAGE display shows “OFF”.5.7. Output SHUT-OFF (SO) Control via Rear Panel J1 ConnectorContacts J1-2, -3 and -15 (Fig.4-2, Item 5) serve as Output Shut-Off (SO) terminals. TheSO terminals accept a 2.5V to 15V signal or Open-Short contact to Enable or Disable thePower Supply output. The SO function will be activated only when a transition from On toOff is detected after applying AC power to the unit (in Auto-Restart mode, the output willnot be enabled after applying AC power; even if SO is at an Off level). After an On to Offtransition is detected, the SO will enable or disable the Power Supply output according tothe signal level or the short/open applied to J1. This function is useful for also connectingpower supplies in a “Daisy-chain” (refer to Section 6.3). The SO control can also be usedalso to reset the OVP and Foldback Protection (refer to Section 5.3 and 5.5 for details).When the unit is shut-off by a J1 signal, the VOLTAGE display will show “SO” to indicatethe unit state. J1-15 is the SO signal input and J1-2, J1-3 (IF_COM) are the signal returnconnections (connected internally). J1-2, -3 and -15 are optically isolated from the PowerSupply output. The SO control logic can be selected by the rear panel SW1 Setup switch.Refer to Table 5-1 for SW1 setting and SO control logic.SW1-5 setting SO signal levelJ1-2(3), 15Power supplyoutput DisplayDown (default) 2-15V or Open0-0.6V or ShortOnOffVoltage/Current“SO”Up 2-15V or Open0-0.6V or ShortOffOn“SO”Voltage/Current