Table of Contents
Advertisement
NOTE
Table 3. Bypass Switch Positions
Switch Position
3 3 . . 7 7
N N o o B B r r e e a a k k T T r r a a n n s s f f e e r r f f r r o o m m U U P P S S M M o o d d e e t t o o S S e e r r v v i i c c e e M M o o d d e e
Failure to understand the correct bypass sequence and position may cause the critical load to be dropped.
Damage to the power modules or the Bypass switch can occur.
•
If the UPS remains in Bypass Mode and incoming AC power is lost, the load is automatically dropped. The
UPS must be in Normal Mode to provide battery backup power.
•
In the UPS or LINE position, AC input power is still connected to the input terminals inside the UPS.
•
If the UPS is in the standby mode and the bypass switch is in the LINE or UPS positions pressing
the red bypass switch interlock button will energize the UPS output.
•
Do not attempt to push the red interlock button or attempt to move the bypass switch handle if the
UPS is operating on battery power.
•
If you have any questions or problems with the bypass operation, call the Help Desk (see , "
11.2 Service and Support
To turn the BPM to SERVICE:
1.
Press and hold the red button and turn the switch to LINE (see
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.
In the UPS or LINE position, AC input power is still connected to the input terminals
inside the UPS.
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.
" ).
Pressing the red button sends the UPS into Bypass Mode. This allows the UPS output
to synchronize with utility for safe, uninterrupted transfer.
4–20kVA Users Guide P-164000669 4–20kVA Users Guide P-164000669—Rev 10
No Break Transfer from UPS Mode to Service Mode
Description
Figure 27
).
29
Advertisement
Table of Contents
