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4. Operation
4.5 Parallel UPS Operation
4.5.1 Parallel System Initial Startup
Note: This procedure should be performed only by qualified service personnel.
Before initial startup, ensure all UPS systems have the same configuration and can be connected in parallel.
1) Turn on each UPS to On-line Mode (refer to section 4.4.1). Using a multimeter, measure the inverter output voltage of each phase for
each UPS to confirm that the inverter voltage difference between actual output and setting value is less than 1.5V (typically 1V). If the
difference is greater than 1.5V, calibrate the voltage by configuring the inverter voltage adjustment (refer to Program Codes 15, 16 and
17, in section 4.7) in the LCD setting. If the voltage difference after calibration remains greater than 1.5V, contact Tripp Lite Technical
Support for further assistance.
2) Calibrate the output voltage measurement by configuring the output voltage calibration (refer to Program Codes 18, 19, and 20, in
section 4.7) in the LCD panel to ensure the difference between the real output voltage and the detected value of the UPS is less than
1V.
3) Turn off each UPS (refer to section 4.4.7), then follow the wiring procedure in section 3.4.
4) Remove the metal cover to access the parallel communication ports on the UPS. Connect each UPS one at a time (maximum of three
units for parallel installation) with the parallel cable and shared current cable. Follow the parallel communication cable configuration in
the figure below, then reinstall the metal cover.
4.5.2 Turning On a Parallel System in On-line Mode
1) Confirm the Maintenance Bypass Switch of each UPS is in the "UPS" position.
2) Turn on the battery breaker (external battery cabinet) of each UPS.
3) Turn on the UPS Input Breaker/Switch of each UPS (for dual input models turn on both the UPS Input Breaker/Switch and the Input 2
Breaker/Switch).
4) When all UPS systems enter Bypass Mode, measure the output voltage between two UPS systems for the same phase to ensure the
phase sequence is correct. If these two voltage differences are near zero, then all connections are correct. If not, check to see if the
wirings are connected correctly.
5) Turn on each UPS one at a time. Press the Power ON/OFF button for 2 seconds until a beep is heard, then release to start the inverter
on each UPS.
6) The UPS systems will then enter On-line Mode synchronously. The parallel system is completed.
30K and 40K Parallel System UPS Wiring
Current Sharing Cable
60K and 80K Parallel System UPS Wiring
32
Parallel Cable
Current Sharing Cable
Parallel Cable
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