AEG IST7 User Manual page 86

5 Use and Operation
Connect the parallel wires, close the mains breaker and bypass breaker (keep all UPS
Step 2
breakers are off) of all UPS. If input power normal, rectifier will start automatically, the touch
screen starts.Connect battery to parallel system.
Step 3 Close battery breaker of each UPS's battery cabinet (if there are many groups battery, it is
necessary to close each battery breaker and then close the total breaker between battery
groups and UPS). Measure the voltage of battery breaker (if there are many groups battery,
measure the voltage of each group battery, and then measure the voltage of total battery
breaker).Ensure that the battery connection is proper (in 2min, all the "battery circuit abnormal"
alarm on main page of the touch screen disappear).
Step 4 Start each UPS. Ensure that all UPS stay in bypass power supply mode, and with no abnormal,
switch on the external dIST7ribution switch, switch off the UPS output switch, and start the
inverter of each UPS manually, all UPS turns to inverter power supply.
Step 5 Measure the output voltage and frequency of each UPS. After each UPS turns to inverter
power supply (user can check whether the system stay in inverter power supply mode through
system running status), check whether the UPS three-phase output voltage and frequency is
normal by the real-time data in touch screen, measure the front-end three-phase output
voltage of output breaker of UPS, ensure that the inverter output voltage is normal (the three-
phase output voltage = output voltage setting ±2.0V), and ensure that the inverter frequency
is normal (the three-phase output frequency = output frequency setting ±0.1Hz). Record the
measured three-phase voltage effective value of each UPS).
Step 6 Switch off the output breaker of one UPS, and measure the voltage difference at the front and
rear of the output breaker in any other UPS, ensure that the corresponding phase voltage
effective value difference less than 5V, and then parallel the UPS. If it does not meet the
requirement, the UPS with big voltage deviation cannot put into parallel system, and it is
necessary to debug again.
Step 7 Shut down the inverter of the UPS. Ensure that there is no abnormal of each UPS, shut down
each UPS manually. All UPS turn to bypass power supply.
Step 8 Check the bypass phase sequence.
Close the output breaker of UPS1 (ensure that the total breaker of load is disconnected, or
once closing the output breaker of UPS1, it will supply power for load), maintain the output
breaker of other UPSs is disconnected, keep the multimeter in AC position, one pen connect
with the output breaker front-end phase-A of UPS2, the other pen connect with the output
breaker back-end phase-A of UPS2, measure the voltage different between front-end and
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IST Series UPS (10kVA-200kVA)
User Manual