Operation
Liebert
®
NXL
™
36
Startup—1+N System Without External Maintenance Bypass
1. Before applying power to the UPS modules, determine the position of the following circuit
breakers and switches:
•
Input Circuit Breaker (CB1)
—Verify that this breaker on the front of the UPS cabinet is in the
open position (see
for the location).
•
Module Battery Disconnect (MBD)
—Verify that this external breaker is open or tripped. If
DC source cabinets are used, verify that breakers on all the cabinets are open.
•
Output Circuit Breaker (CB2)
—This motorized circuit breaker should be open (see
and
for the location).
•
Bypass Circuit Breaker (BFB)
—This circuit breaker should be open (see
and
for
the location).
•
Module Output Breaker (MOB)
Optional—This circuit breaker should be open. This breaker is
external to UPS, possibly in the paralleling gear.
2. Provide power to the UPS controls of all UPS modules starting up to permit the display
touchscreen and system logic to function properly.
a. Close the Bypass Input Breaker (BIB). These breakers are external to each UPS, possibly in
the Maintenance Bypass Cabinet. The display touchscreens should start.
b. Close the Rectifier Feed Breaker (RFB). These breakers are external to each UPS, possibly in
the Maintenance Bypass Cabinet.
3. On the first module, press “Start-up,” then “Manual Start,” then the “All Modules” menu buttons
). The message “Caution: Starting into an unknown load with less than required
number of modules may result in an Overload” will appear.
4. Press “OK.” The message “Close this Module’s BFB & MOB Breaker” will appear.
5. Close the BFB Breaker and the MOB Breaker connected to this unit. This message will appear:
“Close enough other Modules BFBs & MOBs to support the total system load, then press OK.”
6. Close the BFB breakers and MOB breakers of all the UPS units in the system that are to be
brought online.
7. Press “OK.” This message will appear: “Press OK to turn on all available Bypass Static Switches.”
8. Press “OK.” This will turn On the Bypass Static Switch of the modules with BFB breaker and
MOB breaker closed in
. The message “Press OK to start this module’s UPS” will appear.
9. Press “OK.” The message “Close CB1” will appear.
10. Close CB1 (see
and
). The message “Press OK to Issue Rectifier On Command” will
appear.
11. Press “OK.” This will start the UPS’ rectifier. The message “Press OK to Issue Inverter On
Command” will appear.
12. 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.
13. Press “OK.”
14. Close all Battery/DC breakers associated with this module. 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
individually from the startup command (see
This message will appear: “Go to other modules and select ‘This Module’ from start-up menu and
start-up that module’s UPS.”
15. At each module, press “Start-up” then “Manual Start,” then “This Module” menu buttons (see
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.
Содержание Liebert NXL 250 kVA
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Страница 51: ...Operation 43 Liebert NXL Figure 42 1 N UPS Transfer to Inverter menu commands ...
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Страница 110: ...UPS Alarm and Status Messages Liebert NXL 102 NOTES ...
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