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

Eaton 93PR 500 kW UPS
User's and Installation Guide 60
6.4. UPS Control Instructions
6.4.1. 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 switch, output switch, bypass switch are closed the UPS system, and close the
front door.
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 supplied
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.
6.4.2. UPS Shutdown
A single UPS in the system can be shut down only if it is redundant. In practice that means a UPS is not
allowed to be shut down if doing so would lead to an overload condition in the remaining UPSs in the system.
To shut down a single UPS:
1. Press the
Controls
button in the main menu. The System controls screen is displayed.
2. On the
System controls
screen, press UPS controls.
3. On the
UPS control
screen, select Shut down UPS.