ABB PowerValue 11/31 T Operating Manual

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ABB PowerValue 11/31 T Operating Manual Manual pdf 33 page image

Modifications reservedPage 32/495.3.2 UPS ShutdownWith mains supply1. If the UPS is working on bypass-mode, go to step 3.2. If the UPS is on online-mode, press the power-on button continuously for more than 3s. The alarmbuzzer will sound and the UPS will transfer to bypass-mode. Note: the output is still energized.3. Disconnect the UPS from the mains power supply through the output breaker. A few seconds laterthe display will shut down and the output voltage will be removed from the UPS output terminal.In case the bypass has been disabled through the Settings menu, press the power-on button for morethan 3s to shutdown the UPS. The unit will change from online to stand-by-mode. Then, simplydisconnect the input power cable and a few seconds later the display will shutdown.Without mains supply1. To power off the UPS, press the power on/off button continuously for more than 3s. The alarmbuzzer will sound for 3s and the output power will be immediately cut-off.2. After a few seconds, the display will shut down and the output voltage will be removed from theUPS output terminal.5.3.3 Parallel UPS systemInstalling a new parallel system1. Do not switch on the output breaker of each UPS. Switch on the input breaker of the each UPSand the UPS will transfer to bypass.2. Observe the UPS displays to check if there are warnings or fault information. Measure the outputvoltage of each UPS separately to check if the voltage difference between them is lower than 1V. Ifthe difference is higher than 1V, check the wiring.3. Press the power-on button of one UPS. Each UPS will start up and all of them will transfer to theinverter at the same time.4. Measure the output voltage of each UPS separately to check if the voltage difference between themis lower than 0.5V. If the difference is higher than 1V, the UPSs must be regulated.5. Press the power-on button of one UPS. Each UPS will transfer to the bypass-mode. Switch on theoutput breaker of each UPS to parallel the output of all UPSs at the same time.6. Press the power-on button of one UPS, each UPS will start up and they will work in parallel in onlinemode.Adding a UPS to an existing systemRead carefully section 5.4 before following the procedure below.Note: The parallel system must have a main maintenance mechanical switch or static switch accordingto Figure 15.1. Regulate the output voltage of the new UPS separately: check if the output voltage differencebetween the new UPS and the parallel system is lower than 0.5V.2. Ensure that the bypass of the parallel system is working and the bypass setting is “enabled”.3. Remove the cover plate of the maintenance switch on the rear panel of each UPS. The UPS systemwill transfer to bypass automatically.