Operation
35
Liebert
®
NXL
™
3. If the system has optional Bypass breakers (MBB/MIB), the message “Close MBB” will appear in
the multipurpose window.
a. Close the MBB breaker. The message “Press OK to begin startup of this module” will appear.
b. Press “OK” to continue. This will begin the startup procedure for the UPS module.
The message “Close BFB” will appear in the multipurpose window.
and
). The message “Press OK to issue BPSS On
Command” will appear.
5. Press “OK” to continue. This will energize the UPS internal bypass. The message “Close CB1” will
appear.
6. Close CB1 (see
and
). The message “Press OK to Issue Rectifier On Command” will
appear.
7. Press “OK.” This will start the UPS’ rectifier. The message “Press OK to Issue Inverter On
Command” will appear.
8. Press “OK.” The rectifier will be On and the Inverter will be on standby. The message “Press OK
to Issue MBD Enable Command” will appear.
9. Press “OK.”
10. Close all battery/DC breakers. The UPS will stay in this mode until all breakers are closed.
Skip this command if the DC sources are not ready to be started. The DC breakers can be closed
later individually from the startup command (see
).
This message will appear: “Close the MOB’s of this module and enough of the other modules, then
press ‘OK’ [x of y MOB’s closed].”
11. Close the MOB’s for the UPS’s in the system being started. The [x of y MOBs closed] will update
as the MOBs are closed (“x” is number of MOBs closed and “y” is number of MOBs in the system).
This message will appear: “Start enough other modules to support the total system load, then
press ‘OK’ [x of y inverters started].”
12. At each module, Press “Start-up,” then “Manual Start,” then “This Module” menu buttons (see
a. Perform
through
on the rest of the UPS units in the system ready to be placed on-
line.
b. The [x of y inverters started] will update as inverters are brought to standby (“x” is the
number of inverters on standby and “y” is the number of inverters in the system).
13. Go to the first UPS and press “OK.” The message “Close MIB” will appear in the multipurpose
window.
14. Close the MIB breaker. The message “Open MBB” will appear in the multipurpose window.
15. Open the MBB breaker. The message “Press OK to transfer all modules to inverters” will appear.
16. Press “OK.”
This will put the system online and the load on the UPS.
NOTE
The DC source charge current may increase quickly, but then should slowly decrease. If the
system is recovering from a DC source shutdown or an input power failure, the UPS rectifier
will be recharging the DC source. Recharge current can be more than 100A. The maximum
allowable recharge current for a unit depends on the kVA rating and the DC source recharge
current limit.
NOTE
Do not transfer the module from the transfer screen from any of these modules.
Summary of Contents for Liebert NXL 250 kVA
Page 8: ...vi ...
Page 51: ...Operation 43 Liebert NXL Figure 42 1 N UPS Transfer to Inverter menu commands ...
Page 57: ...Operation 49 Liebert NXL Figure 45 1 N UPS shutdown menu commands ...
Page 86: ...Specifications Liebert NXL 78 ...
Page 110: ...UPS Alarm and Status Messages Liebert NXL 102 NOTES ...
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