System Operation; Start The Ups In "Online" Mode (Default Mode); Start The Ups In "Bypass" Mode - Eaton 93PR Series Installation And Operation Manual

6.3. System operation

NOTE
Please see Section
6.3.1. Start the UPS in "Online" mode (default mode
The UPS system may be composed of a single UPS unit or a plurality of UPS units connected in
parallel.
Start the UPS system:
1. Check and ensure 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 is no alarm.
6. Select the "Control" button on the menu, and press "OK" to start the system.
7. Select "System" on the control interface.
8. Click the "Start" button on the system interface, and press "OK" to start the system.
9. Press the "Start" button on the "System Control" page. If automatic bypass is enabled,
the power will be supplied to the critical load via the bypass immediately, the UPS will run
in bypass mode until the inverter is turned on, and the UPS will switch to online mode. If
automatic bypass is disabled, the system will turn on the rectifier first, and then turn on the
inverter when the rectifier turns normal. When the rectifier is normally turned on, the battery
relay will be turned off automatically. It takes about 20 seconds for the UPS system to reach
online mode.
10. At this point, the UPS is running in online mode, and all UPS status indicator lamps in the
system indicate online mode.
6.3.2.

Start the UPS in "Bypass" mode

If the UPS inverter output is unavailable and the critical load needs power supply, the following
steps shall be performed:
When the UPS is in "Bypass" mode, the critical load is not protected if any bypass
interruption or exception occurs.
1. Check and ensure that the rectifier input switch, the output switch and the bypass switch are
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4.4
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