Parallel Operation (Optional) - INFOSEC UPS SYSTEM E4 Pro One Series User Manual

NOTE 2: All parameter settings will be saved only when UPS shuts down normally with external battery
connection. (Normal UPS shutdown means turning off input breaker in bypass/no output mode).

3-5. Parallel Operation (Optional)

3-5-1. Parallel system initial startup
First of all, please make sure all of the UPSs are parallel models and have the same configuration.
1) Turn on each UPS to AC mode respectively (Refer to section 3-4-1). Then, measure the output
voltage of each UPS to check if the voltage difference between actual output and setting value is
less than 1.5V (typical 1V) with multimeter. If the difference is more than 1.5V, please calibrate the
voltage by configuring inverter voltage adjustment in LCD setting. Please contact your local
distributor or service center for help.
2) Calibrate the output voltage measurement by configuring output voltage calibration in LCD setting
to make sure the error between real output voltage and detected value of UPS is less than 1V.
3) Turn off each UPS (Refer to section 3-4-7.). Then, follow the wiring procedure in section 2-4.
4) Remove the cover of parallel share current cable port on the UPS, connect each UPS one by one
with the parallel cable and share current cable, and then screw the cover back.
3-5-2. Turn on the parallel system in AC mode
1) Turn on the input breaker of each UPS. After all UPSs enter to bypass mode, measure the voltage
between output L1 of each UPS with multimeter. If the voltage difference is less than 1V, that
means all connections are correct. Otherwise, please check if the wirings are connected correctly.
2) Turn on the output breaker of each UPS. Before turning on each UPS in turns, check if PARXXX is
displayed in each UPS sequentially. If no "PARXXX" exists in any UPS, please check if the parallel
cables are connected correctly.
3) Turn on each UPS in turns. After a while, the UPSs will enter to AC mode synchronously and then,
the parallel system is completed.
3-5-3. Turn on the parallel system in Battery mode
1) Turn on the battery breaker (if an external backup module is connected) and output breaker of
each UPS
NOTE: It's not allowed to share one battery pack in parallel system. Each UPS should be connected to
its battery pack.
2) Turn on any UPS. A few seconds later, the UPS will enter to battery mode.
3) Press the "ON" button to set up the power supply for another UPS, check if PARXXX is displayed. If
not, please check if the parallel cables are connected correctly. Then Turn on another UPS. A few
seconds later, the UPS will enter to battery mode and add to the parallel system.
4) If you have the third UPS, follow the same procedure of 3). Then, the parallel system is complete.
3-5-4. Add one new unit into the parallel system
1) You can not add one new unit into the parallel system when whole system is running. You must cut
off the load and shutdown the system.
2) Make sure all of the UPS are the parallel models, and follow the wiring refer to section 2-3.
3) Install the new parallel system refers to the previous section.
3-5-5. Remove one unit from the parallel system (optional)
1) Press the "OFF" key twice and each time should last for more than 0.5s. Then, the UPS will enter
into bypass mode without output.
2) Turn off the output breaker of this unit, and then turn off the input breaker of this unit.
3) After it shuts down, you can remove the parallel cable and share current cable. Then, remove the
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