Manual Operations-All Systems; Startup-Single Module System - Vertiv Liebert NXL Series Operation And Maintenance Manual

2.15 M O
ANUAL PERATIONS
The Liebert NXL UPS is designed to function while unattended by an operator. The system control logic
automatically handles many important functions, as explained in 2.16 - Automatic Operations. Other
procedures must be performed manually.
Manual procedures available to the operator include startup, load transfers and shutdowns. These procedures
are performed by using the touchscreen and some manually operated circuit breakers and switches.
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.
• Startup—including initial startup, recovering from input power failure, recovering from DC source shutdown and recovering
from shutdowns for emergencies or maintenance.
• Load Transfers—including transfers from UPS to bypass and retransfers from bypass to the UPS system.
• Maintenance Bypass Load Transfers—including transfers from internal bypass to maintenance bypass and transfers from
maintenance bypass to internal bypass.
• Shutdowns—including module shutdowns for maintenance and emergency shutdowns.
NOTE
The following procedure assumes that the UPS installation inspection and initial startup have been performed
by Liebert Services. A Vertiv-authorized representative must perform the initial system startup to ensure proper
system operation.
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.
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.
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.
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 Figures 2, 6 and 7). 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.
Vertiv | Liebert ® ™
NXL
—A S
LL YSTEMS
250-1100kVA, 60Hz, Three Phase, SMS & MMS UPS Operation and Maintenance Manual
Operation
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