Emerson Liebert NXL series Operation And Maintenance Manual page 90

Liebert NXL UPS
Event Message Event Definition
Output Fault
This summary event occurs when the
detected system output exceeds
acceptable limits in either voltage or
frequency.
If the UPS was on Inverter at the time
of the event, the UPS transfers to
bypass provided the bypass voltage is
available.
If the UPS was on bypass at the time of
the event, the UPS shuts down rather
than allowing unacceptable voltage to
reach the load.
Rectifier Fault
This summary event indicates a
potentially serious condition in the
Rectifier circuit. The controls respond to
this by turning off the Rectifier, opening
the input filter contactor, and placing
the UPS on battery operation. This fault
is non-latching. When the underlying
condition is no longer present, this fault
and any control activity tied directly to
this fault reverts to normal.
Page 90
Operation and Maintenance Manual 250-300-400-800kVA
Recommended Action
Press "SILENCE" to silence the audible
alarm.
Check the Active Event Window and
investigate other events to further
analyze.
Press "RESET" to attempt to reset any
latched events.
Check the One-Line Display to determine
the system status (on UPS, Bypass, or
Off).
Check the input and bypass (dual input
only) and observe the One-Line colour.
Green indicates good power present,
orange means power is present but
outside nominal range, and gray means
power is not present.
If the load is off and the input voltage is
ok, attempt to restart the UPS by
pressing "Startup," "Manual Start," and
follow the prompts.
If the Input Meter indicates input or
bypass is not available, investigate and
resolve the power problem.
If the load is on bypass and all alarms are
reset, press "Transfer," "UPS," to attempt
to transfer back to Inverter.
If the issue cannot be resolved, contact
your factory-authorized service provider.
Observe the One-Line Display and the
Active Event Window for current UPS
condition - On Battery?
Observe the colour of the Bypass Line on
the One-Line Display. If green, bypass is
available. This is significant, because if
the batteries fail, the UPS transfers
safely to the bypass line. If the UPS is on
battery, and the bypass line on the One-
Line Display is not green, contact your
factory-authorized service provider
immediately and prepare to shut down as
the UPS turns off once the batteries are
depleted. Press "SILENCE" to silence the
audible alarm.
Press "RESET" to attempt to clear the
fault condition. If the Rectifier Fault
clears, press "Startup," "Manual Start,"
"Rectifier" to attempt to restart the
Rectifier. If this is successful, observe
normal operation of the Rectifier,
indicated on the One-Line Display by a
green outline around the Rectifier box,
and normal DC Bus voltage on the DC
Bus Meter. If the Rectifier starts
normally, attempt to close the input filter
contactor by pressing "Startup," "Device
Control", "Close Trap".
If the UPS is not on battery, but
transferred to bypass, contact your
factory-authorized service provider. If the
Rectifier Fault was cleared by pressing
"RESET", but the fault returns as soon as
a Rectifier restart is attempted, contact
your factory-authorized service provider.