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UPS with Bypass Electrical Installation
The bypass switch has three positions as described in Table 3.
NOTE
Table 3. Bypass Switch Positions
Switch Position
LINE
UPS
SERVICE
Bypass Module Operation
No Break Transfer from UPS Mode to Service Mode
It is critical that the following steps are followed to ensure correct and safe operation.
To turn the BPM to SERVICE:
1.
Press and hold the red button and turn the switch to LINE (see Figure 22).
NOTE
The UPS is now in LINE mode. The critical load is fed directly from utility and the UPS remains energized from
utility power. The UPS may be left in this mode while trying to troubleshoot, gather alarms from the UPS, or
perform other preventative maintenance activities.
Depress and HOLD
red button
Figure 22. Bypass From UPS to LINE
26
Eaton 9PXM UPS (4-20 kVA) User's Guide P-164000669—Rev 05
In the UPS or LINE position, AC input power is still connected to the input terminals
inside the UPS.
Description
When the switch is in the LINE position, utility power is directly connected to the critical load and the
output of the UPS is disconnected. In this state the UPS remains powered, which is often beneficial for
troubleshooting, obtaining logs, or updating firmware.
The normal operating state of the system occurs when the BPM switch is in the UPS position. Utility
power is fed to the bypass, where power is then fed to the UPS. The UPS provides critical battery backup
and power conditioning and power is then fed back to the bypass switch and then the critical load.
Like the LINE position, the SERVICE position connects the load directly to AC input power and disconnects
UPS output; however, because SERVICE also disconnects AC input from the UPS, this is the appropriate
position for UPS maintenance or repair. In the SERVICE position, the UPS can be completely removed
from the system.
Pressing the red button sends the UPS into Internal Bypass mode. This allows the
UPS output to synchronize with utility for safe, uninterrupted transfer.
Rotate switch
to LINE position
CAUTION
LINE
MODE
UTILITY
INPUT
OUTPUT
BPM
TO
FROM
UPS
UPS
INPUT
OUTPUT
UPS
LOAD
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