66..33 SSyysstteemm ccoonnttrrooll iinnssttrruuccttiioonnss
66..33..11 SSttaarrtt tthhee UUPPSS iinn OOnnlliinnee mmooddee ((ddeeffaauulltt mmooddee))
The UPS system can consist of a single UPS unit or several UPS units connected in parallel.
To start the UPS system:
1. Make sure that the rectifier input switch, the output switch, and the bypass switch are closed, and that
the maintenance bypass switch is open.
2. Close the external input distribution switch.
3. Close the external bypass distribution switch.
4. Observe the logic power supply indicated on the UPS control panel, and repeat steps 1-3 for each
UPS in the system.
5. Make sure that there are no active alarms in the system.
6. Select the Control icon on the menu, and press OK to start the system.
7. Select System on the control page.
8. Tap on the Start icon on the system page, and press OK to start the system
9. Press the Start icon on the System Control page.
• If automatic bypass is enabled, the power is supplied to the critical load through the bypass
immediately, the UPS runs in Bypass mode until the inverter is turned on, and the UPS transfers to
Online mode.
• If automatic bypass is disabled, the system turns on the rectifier first, and then turns on the inverter
when the rectifier turns normal. When the rectifier is normally turned on, the battery relay is turned
off automatically.
It takes approximately 20 seconds for the UPS system to transfer to Online mode.
As a result, the UPS operates in Online mode, and all UPS status indicator lights in the system indicate
Online mode.
66..33..22 SSttaarrtt tthhee UUPPSS iinn BByyppaassss mmooddee
If the UPS inverter output is unavailable and the critical load needs a power supply, complete the following
steps.
CAUTION
When the UPS is in Bypass mode, the critical load is not protected if any bypass
interruption or exception occurs.
1. Make sure that the rectifier input switch, the output switch, and the bypass switch are closed, and that
the maintenance bypass switch is open (if the UPS is equipped with such a switch).
2. Close the front door.
3. Close the external input distribution switch.
4. Close the external bypass distribution switch.
5. Observe the logic power supply indicated on the UPS control panel, and repeat steps 1–3 for each
UPS in the system.
6. Select Control on the menu, and enter the password to access the control page.
7. Select System on the control page.
EATON 93T USER’S AND INSTALLATION GUIDE 614-40270
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December 2023 www.eaton.eu 7788
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