Vertiv Liebert EXM - Maintenance Mode; Output Voltage Adjustment; Generator Mode

Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 58
preferred source. If the bypass voltage or frequency becomes outside preset limits, the UPS load
is transferred back to the inverter.
Maintenance Mode
For maintenance or repair, the Liebert
®
EXM
™
may be operated in maintenance mode. To place the
Liebert
®
EXM
™
in maintenance mode, follow the instructions in 6.6 - Switching the UPS from
Normal Operation to Maintenance Bypass.
Output Voltage Adjustment
This feature allows a Liebert
®
Customer Engineer to adjust the Liebert
®
EXM
™
’s output voltage
over a range of -5% to +5% of nominal. The output voltage adjustment can be used to
compensate for any drop in line voltage that may occur when the UPS is a significant distance
from the protected load. In addition, it can be used to optimize the UPS output voltage for loads
that operate more efficiently at a voltage different from the nominal Liebert
®
EXM
™
output voltage.
Generator Mode
The Liebert
®
EXM
™
UPS can be set up for operation in Generator Mode by a Vertiv
™
Services
engineer. The setup requires connecting J26 Pin 2 to Pin 4.
WARNING
Risk of arc flash and electric shock. Can cause equipment damage, injury and death
The UPS input and output must be protected with external overcurrent protection devices.
In maintenance mode, the input and output busbars remain energized and present an
electric shock hazard.
AVERTISSEMENT
Risque d’arc ou de décharge électrique pouvant entraîner des dommages matériels, des
blessures et même la mort.
L’entrée et la sortie du système ASC doivent être protégées par des dispositifs de
protection de surintensité externes. En mode d’entretien, les barres omnibus d’entrée et de
sortie demeurent sous tension et présentent un risque de décharge électrique.