2.14.7 Eco Mode; Manual Operations-All Systems; Figure 36 Eco Mode Power Flow - Emerson Liebert NXL 250 kVA Operation And Maintenance Manual

2.14.7 ECO Mode

When ECO Mode is active, the critical load is supported by the bypass source. The rectifier is On and
providing power to the DC source for charging. The inverter is on standby, available to provide power
to the critical load if a fault occurs on the bypass line. See Figure 26.

Figure 36 ECO Mode power flow

Bypass
Input
DC Source
2.15 Manual Operations—All Systems
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 Liebert-authorized representative must perform the
initial system startup to ensure proper system operation.
BFB
CB1
MBD
DC Bus
29
Operation
Module
Output
CB2
Liebert
® ™
NXL