15
Turn off the UPS output switch on the output PDC, or turn off the external output
distribution switch.
Turn off the battery circuit breaker. If there are multiple battery strings, turn off the
general circuit breaker between battery strings and the UPS and then the circuit
breaker for each battery string.
Open the mains and bypass input circuit breakers on the input PDC, or turn off
the external input power distribution switch.
Turn off the input surge protection switch (if any) on the input PDC.
5. In the displayed dialog box, tap Yes to start the inverter.
6. Ensure that the UPS transfers to normal mode. View the system running diagram to check that
the Bypass mode alarm disappears on the LCD. Check the UPS three-phase output voltage
and frequency by viewing the AC Output on the LCD. Use a multimeter to measure the three-
phase output voltage and frequency. The three-phase output voltage should be 220 V AC, 230
V AC, or 240 V AC, and the frequency should be 50 Hz or 60 Hz.
7. Check whether the number of batteries is the same as Number of cells (a cell is a 2 V DC
battery) configured on the screen. Use a multimeter to check that the sum of the absolute
voltages of positive and negative battery strings are greater than a certain value (1.9 x Number
of cells) to ensure that the battery strings are connected properly.
8. After checking that the battery strings are properly connected, close the battery circuit breaker
(if there are multiple battery strings, close the circuit breaker for each battery string and then the
general circuit breaker between battery strings and the UPS).
9. Turn on the external output switches to supply power to loads.
6Shutting down the UPS
After the inverter is shut down, the system transfers to the bypass mode if the system bypass
operates properly or provides no output for loads if the system bypass becomes faulty. Before
you shut down the UPS, ensure that the loads are disconnected to meet any power failure
conditions.
1. On the main screen, tap Common Functions. Tap Inv. OFF.
2. If you have not logged in, enter a user name and password, and tap on the login screen
displayed.
3. In the displayed dialog box, tap Yes to shut down the inverter.
After the inverter shuts down, if the bypass is normal, the UPS transfers to bypass mode; if the
bypass is abnormal, the UPS supplies no power, and the loads shut down.
Shutting down the Inverter to Transfer a Single UPS to Bypass Mode
6.1
Powering Off a Single UPS
6.2