UPS IST7 Series (60K-200K)
User Manual
5 Use and Operation
97
Step 2
Connect the parallel wires, switch on the mains switch and bypass switch of all UPSs(keep the output
switch of all UPSs on off status). If the input power is normal, the rectifier will start automatically, and
the touch screens begin to start.
Step 3
Connect the battery to the parallel system.
Step 4
If the monitor page of each UPS has no alarm, switch on the battery switch of each UPS(if there are
many groups of batteries, it needs to switch off the switch of each battery group, and then switch off
the total switch between UPS and battery groups). Measure the voltage of battery switch by
multimeter(if there are many groups of batteries, measure the voltage of battery switch of each battery
group, and then measure the voltage of total switch). Ensure that the battery connection is normal (the
"Battery circuit abnormal" alarm on the main page of touch screen disappears within 2min).
Step 5
Check if the system alarms are all disappeared. If there is any fault alarm, please stop the startup
operation and inform serviceman to solve the problem till all faults are removed.
Step 6
Start the inverter of each UPS. Ensure that each UPS stay in bypass power supply mode and the system
has no alarm, start the inverter of each UPS manually, and all UPSs turn to inverter mode.
Step 7
Measure the output voltage and output frequency of each UPS. After each UPS turns to inverter
mode(view the system running status in the touch screen to check if the system is in the inverter power
supply mode.), check if the output voltage and output frequency of UPS are normal through the real-
time data in the touch screen, measure the front-end output voltage of output switch in output
distribution cabinet or external output distribution switch to ensure that the inverter output voltage is
normal(output voltage = output voltage setting
±
2V), and ensure that the inverter output frequency is
normal(output frequency = output frequency setting
±
0.1Hz). Record the measured output voltage
effective value of each UPS).
Step 8
Compare the output voltage of each UPS. After measuring the output voltage and frequency of each
UPS, compares the output voltage of each UPS, ensure that the phase voltage effective value difference
of any two UPSs is less than 5V, and then the parallel operation can be done. If it does not meet the
requirement, the UPS with big voltage difference cannot be connected in parallel system, and it is
necessary to debug again.
Step 9
Shut down the inverter of each UPS. Ensure that there is no alarm of each UPS, shut down each UPS
manually. All UPSs turn to the bypass mode.
Step 10
Check the phase sequence of bypass.
Switch on the output switch of UPS 1(ensure that the total switch of load is switched off, or once
switching on the output switch of UPS 1, it will supply power for load), keep output switches of other
UPSs off, set the multimeter to AC position, one pen connects with the output switch front-end phase-
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