Eaton 93PR Series - UPS Control Instructions; Starting a Single UPS

25-75 kW
User's and Installation Guide 66
6.5 UPS Control Instructions
6.5.1 Starting a Single UPS
Ensure that load level does not exceed single UPS capacity.
To start the UPS
1. Unfasten the front door latch and swing the door open.
2. Verify that rectifier input switches, bypass input switch, neutral switch are closed if included inside the UPS
system, and verify that battery breaker is closed.
3. Close the UPS input feeder circuit breaker.
4. Close the UPS bypass input feeder circuit breaker.
5. Observe the UPS control panel display becoming active, indicating logic power.
6. Press the
Controls
button in the main menu. Press the
UPS controls
button.
7. On the UPS Controls screen, the system status should indicate SHUTDOWN.
8. Press the
Go online
button on the System Controls screen. If Auto Bypass is enabled (factory default), the
critical load is immediately supplied by the bypass source, in Bypass Mode, until the inverter turns on and the
UPS transfers to Double Conversion Mode. The status indicator on the UPS control panel indicates the UPS
is in Bypass Mode. If auto bypass is not enabled, the UPS output remains off until the UPS system transfers
to Double Conversion Mode.
9. Press the
Go online
button on the UPS control screen.
10. Observe the following messages appear sequentially on the UPS status line:
STARTING
ONLINE
The rectifier and inverter turn on. The DC voltage continues to ramp up to full voltage. Once the DC link
reaches full voltage, and the battery breaker is closed, the UPS output relay K3 closes. Power is now suplied
to the Critical load in Double Conversion Mode. It takes approximately 20 seconds for the UPS system to
achieve Double Conversion Mode.
11. The UPS system is now operating in Double Conversion Mode and the NORMAL status indicator is
illuminated.