Vertiv Liebert EXM - 6.4 Liebert EXM Operating Modes

Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 56
6.4 Liebert® EXM™ Operating Modes
The UPS is designed to operate as an on-line, double-conversion, reverse-transfer system in the
following modes:
•Normal Mode
• Battery Mode
•Auto-Restart Mode
•ECO Mode
• Bypass Mode
• Module Redundancy Mode
• Maintenance Mode (Manual Bypass)
• Sleep Mode
• Paralleling Mode
• Output Voltage Adjustment
• Generator Mode
Normal Mode
Operating in normal mode, the Liebert
®
EXM
™
’s rectifier derives power from a utility AC source and
supplies regulated DC power to the inverter, which regenerates precise AC power to supply the
connected equipment. The rectifier also uses the utility source power to charge the batteries.
Module Redundancy Mode
When the Liebert
®
EXM
™
is in module redundancy mode, the load percentage is calculated using
the available power module capacity or nameplate rating capacity, whichever capacity is lower.
Module redundancy mode can be set at the factory or by the user. A maximum of one module can
be set for redundancy. Availability of this feature depends on module capacity of the frame. Refer
to the UPS control manual, SL-26200, for instructions on setting this feature. The manual is
available at Vertiv’s
™
Web site, www.vertivco.com
Example 1
• Four 50kVA power modules installed
• Nameplate rating capacity = 150 kVA
• One power module in redundant mode
• Configured capacity = 150kVA
•Load = 150kVA
Load percentage will be calculated based on nameplate rating capacity = 150kVA capacity. In the event of
a single power module fault, the system will signal a Loss of Redundancy Alarm and a Power Hardware
Mismatch and continue in double-conversion mode and provide up to 150kVA capacity.
NOTE
1. The user controls and indicators referred to in these procedures are detailed in the UPS control panel
manual, SL-26200, available at Vertiv’s
™
Web site, www.vertivco.com
2. The audible alarm may sound at various points during these procedures. It can be canceled at any time
by pressing the menu button (under any login), pressing Alarms and then pressing Alarms.
NOTE
This unit refers to some modes and conditions that are set or adjusted using proprietary service
software. To take advantage of all the available features for the Liebert
®
EXM
™
, the unit must be
commissioned by a Vertiv
™
-authorized engineer.