Operation
Liebert
®
NXL
™
30
2.15.1 Startup—Single Module System
This section lists typical step-by-step instructions. The touchscreen will list all steps required for the
process, based on the unit’s condition and other factors.
If the installation includes a Maintenance Bypass, power may already be supplied to the critical load
equipment through the Maintenance Bypass. If there is no power to the critical load, apply power
through the UPS bypass line per the following procedure.
During startup, power is supplied to the critical load through the UPS (internal) bypass line while the
UPS system is being energized. Depending on the reason for the UPS system shutdown, power may
be present in the bypass line. To determine this, check the Monitor/Mimic Display screen after control
power is available.
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
(
and
) is in the open position.
•
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.
•
Bypass Circuit Breaker (BFB)
—This circuit breaker (
and
) should be open.
•
Output Circuit Breaker (CB2)
—This motorized circuit breaker (
and
should be open.
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). This breaker is external to the UPS; it may be in the
Maintenance Bypass Cabinet. The display touchscreen should start.
b. Close the Rectifier Feed Breaker (RFB). This breaker is external to the UPS; it may be in the
Maintenance Bypass Cabinet.
3. Start the module:
a. Press the “Start-Up” then “Manual Start” menu buttons (see
). The message “Close
BFB” will appear in the multipurpose window.
). The message “Press OK to issue BPSS On
Command” will appear.
!
WARNING
Risk of electrical shock. Can cause equipment damage, personal injury and death.
The following procedure provides power to the critical load distribution system. Verify that
the critical load distribution is ready to accept power. Make sure that personnel and
equipment are ready for the critical load distribution system to be energized.
NOTE
If the system was shut down in response to an “Emergency Off”, there may be alarm messages
on the touchscreen that describe system conditions before (or at the time of) the shutdown.
Some or all of the alarm conditions may have been resolved. To clear these alarm messages,
turn Off control power (see
,
and
). Wait at least 10 minutes for the control power
circuitry to completely de-energize. After 10 minutes, turn control power back On.
!
WARNING
Risk of electrical shock and high short circuit current. Can cause equipment damage, personal
injury and death.
If the UPS has been shut down for maintenance, verify that all of the UPS system doors are
closed and latched. All test equipment must be removed from the system. All electrical
connections must be secure.
NOTE
If power to the critical load is already supplied through this breaker, keep this breaker closed.
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 ...
Page 111: ......
