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4.3.5 Shutdown procedures (Completely shutting down the UPS and loads)
Follow the steps below when completely shutting down the UPS and disconnecting the loads.
Disconnect all the power switches and breakers. The loads are no longer powered by UPS.
Disconnect all the UPS loads.
Shut down the UPS after pressing
+
for more than 0.5s. UPS enters the bypass
mode afterwards.
After disconnecting the mains, bypass and output switches as well as the external battery
switch, the display screen goes off.
Make sure that the maintenance switch has been disconnected.
The external mains distribution switch and the external output switch must be disconnected
for the complete power failure of UPS. Stick the warning labels on the UPS as well.
4.3.6 Emergency power off (EPO)
After inserting the short circuit jumper of the EPO port on the rear panel, UPS enters the EPO mode.
EPO switches are used for turning off the UPS in case of emergency (such as fires, floods, etc.). The
system will turn off the rectifier and inverter, and will immediately cut off the load power supply
(including inverter and bypass output). Furthermore, the battery will stop charging or discharging.
If the UPS mains input still exists, it indicates that the circuit controlled by the UPS is still electrified,
while the UPS input is shut down. If it is necessary to cut off the UPS mains power supply,
disconnect the UPS external mains input switch.
UPS must be completely powered off, which means to manually disconnect all the input switches
(including battery switches), and thus UPS can exit the EPO mode.
Caution:
When conducting EPO operations, the UPS system will cut off the load power supply
(output cutoff). This function shall only be used after confirming the UPS output cutoff.
4.3.7 Parallel UPS operation
4.3.7.1 Startup parallel UPS
Confirm all the power lines. Make sure that the parallel cables are properly connected.
Close the UPS1 mains and bypass switches. Press the UPS1 shutdown key combination
for shutdown. Confirm the UPS1 bypass output. Make sure that there is no automatic
startup.
Turn off other UPS in the parallel system successively by referring to the previous step.
Check whether the fault/alarm interface on the display screen is normal. If it is abnormal,
please refer to the fault/alarm list for abnormality elimination.
Close the UPS1 output switch. Press the startup key combination to turn on the UPS1.
After switching to the inverter output, make sure that UPS2, UPS3…UPSN are in standby
mode.
Turn on the UPS2, UPS3…UPSN successively by referring to the previous step.
After switching all the UPS in the parallel system to inverter output, close the battery
switches of UPS2, UPS3…UPSN successively.
Refer to the Step 3when adding a single unit to the parallel system.
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