4–20kVA Users Guide P-164000669 4–20kVA Users Guide P-164000669—Rev 09
31
NOTE
In the UPS or LINE position, AC input power is still connected to the input terminals
inside the UPS.
Table 3. Bypass Switch Positions
Switch Position
Description
LINE
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.
UPS
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.
Service
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.
33..77
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CAUTION
Failure to understand the correct bypass sequence and position may cause the critical load to be dropped. Do
not operate the bypsass switch if the UPS is in battery mode. Damage to the power modules or the bypass
switch can occur.
To turn the BPM to SERVICE:
1.
Press and hold the red button and turn the switch to LINE (see
).
NOTE
Pressing the red button sends the UPS into Internal Bypass mode. This allows the UPS
output to synchronize with utility for safe, uninterrupted transfer.
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.
Summary of Contents for 9PXM
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