2. Verify on the Home page of the display that the UPS is in Bypass Mode.
3. Put the Maintenance Bypass Switch in OFF position. The load is still supplied in Bypass mode.
4. Mount back the Maintenance Bypass metallic cover.
5. Go to CONTROL page and select UPS on/off icon. The screen will show Turn on UPS?. Select Yes.
6. In a few seconds, the UPS will turn On and enter into Line mode.
3.5 Parallel Operation
1. Parallel system initial startup
Make sure that all the running UPSs are parallel models and have the same configuration.
a. Turn on each UPS in AC mode respectively. Then, measure the inverter output voltage of each phase for
each UPS with a multi-meter. Calibrate the inverter output voltage by configuring inverter voltage
adjustment (Refer to SETTINGÚAdvanceÚMaintainerÚVOL CALIÚInverter CALI screen) in LCD
menu until the inverter output voltage difference of each UPS is within 1V or less.
b. Turn off each UPS. Then, follow the wiring procedure in UPS Installation for Parallel System on page22 .
c. 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 replace the cover.
NOTE: The parallel connection can be realized by connecting the parallel cables in daisy chain or in a closed loop
configuration (for higher reliability).
2. Turn on the parallel system in AC mode according to the correct output configuration:
In case of 3-In 3-Out configuration:
a. Turn ON the line input breaker and bypass input breaker of each UPS. After all UPS enters into bypass
mode, measure the Input voltage and bypass voltage between two UPSs for the same phase to make sure
the phase sequence is correct. If these two voltage differences are near to zero, that means all connections
are met. Otherwise, check if the wirings are connected correctly.
b. Go to INFO Sub menu (page 2) and verify that the UPS have automatically set PAR state as Parallel and
PAR ID with a different number among the different UPS.
c. Turn ON the output breaker of each UPS.
d. Turn ON each UPS from the control page of its own display.
e. After that all the UPS have received the Turn ON command, they will Turn ON simultaneously.
In case of 3-In 1-Out configuration (single phase output):
a. Measure the input voltage and bypass voltage between two UPS for the same phase to make sure the
phase sequence is correct. If these two voltage differences are near to zero, that means all connections are
met.
b. Turn on the output input breaker and bypass input breaker of each UPS in this order.
c. Go to INFO sub menu (page 2) and verify that the UPS have automatically set PAR state as Parallel and
PAR ID with a different number among the different UPS.
d. Turn ON the line input breaker of each UPS.
e. Turn ON each UPS from the control page of its own display.
f. After that all the UPS have received the Turn ON command, they will Turn ON simultaneously.
3 Operations Proprietary and Confidential ©2024 Vertiv Group Corp. 73
Vertiv™ Liebert® MTP Online UPS User Manual 20-40-80kVA
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