Eaton 93PR 500 kW UPS
User's and Installation Guide
56
6.2.4. System Events
incoming utility power. In Battery or Bypass Modes, the UPS may issue alarms to let you know exactly what
event caused the change from Double Conversion Mode. System events on the UPS can be indicated by
horns, lights, messages, or all three.
Select
Logs
from the main menu screen to look at any currently active events.
• System Event Horn
- The system event horn beeps to alert an operator that an event needing attention
is taking place.
• System Event Indicators
- The status indicators on the UPS control panel and the event horn let you
know when the UPS system is operating in any mode other than Double Conversion Mode. Only the
Normal indicator is visible during normal UPS system operation. The other indicators illuminate to
indicate alarms or events. When an alarm occurs, first check these indicators to see what type of event
has taken place.
• System Event Messages
- When a system event occurs, a message appears in the status bar of the
display. This message is also written to the Active Events log. Some notices and alarms may be
accompanied by an audible horn. To silence the horn, press any button once.
6.3. System Control Instructions
6.3.1. Starting the UPS System in Double Conversion Mode
.
The UPS system can consist of a single UPS or several parallel UPSs.
To start the UPS system:
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. Repeat steps 1-5 for
each individual UPS in the system.
6. Press the
Controls
button in the main menu. The System Controls screen appears.
7. On the System 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. Observe the following messages appear sequentially on the System Controls screen:
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 and the
static switch turns off. 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.
10. The UPS system is now operating in Double Conversion Mode and the NORMAL status indicator is
illuminated in all UPSs in the system.
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