East EA990 Super, User Manual

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User Manual 200 kVA-1200 kVA UPS 5 Operation
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5.9 Operation of Parallel UPS System
5.9.1 Start Up Parallel System
CAUTION

Before installation and wiring on site, make sure all switches on the UPS are disconnected.

Before starting the equipment, check whether installation and wiring of the system are perfect,
whether all the screws are locked, whether the wiring is correct.

After the parallel system is turned on normally, do not operate the "Control" menu bar of UPS
without the permission of the relevant authorized engineer.

Do not operate the emergency shutdown EPO button in a non-emergency situation after the
system is started normally.

When the single unit of the parallel system is maintained, confirm that the capacitor voltage of
the failed UPS is below the safe voltage before operation.
Step 1 : Establish the parallel system
For establishment of the parallel system of the UPS needing parallel operation, please refer to "Section 3.3
Installation of Parallel UPS" for installation mode. Connect the power cables and the control cables. If the battery
packs are independent, they can be connected separately.
Step 2 : Confirm the wiring.
Use the multimeter to confirm again that the cables are connected in accordance with the requirements, and
confirm that the wiring is correct.
Step 3: Confirm parallel signal
After the connection is confirmed, close the mains input switches of all UPS. If the communication line for
parallel operation is not connected, "Parallel line abnormal" fault will be reported. Therefore, make sure to
confirm that there is no "Parallel line abnormal" fault in each UPS.
Step 4 : Confirm software version
confirm the program versions of all UPSs: access the About interface of the system menu, and click the About
interface to confirm display version, monitor version, rectifier version and inverter version to ensure that the
program version of all UPSs is consistent.
Fig. 5-11 About interface
Step 5 : Confirm the parameters
Check whether the advanced parameters, input parameters, output parameters, bypass parameters and battery
parameters of all UPS are consistent (the setting of the battery pack is consistent when it is set to shared, and it is
set to independent, the battery is specifically set according to the equipment configuration). Refer to the function
introduction of "4.2.6 Settings" for setting each parameter.