Emerson 250-400kVA - Manual (Page 66)

UPS Alarm and Status Messages
60
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.
Observe the One-Line Display and the Active Event
Window for current UPS condition - On Battery?
Observe the color 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.
Redundant Fan
Fail
This alarm indicates a fan has failed
Press “SILENCE” to silence the audible alarm.
Contact your factory-authorized service provider.
Regen Active
Regeneration Mode is a service mode that is
normally controlled by the service technician.
Regeneration Mode Status or Alarm messages
are generally intended for the service person.
This status message informs the user the UPS is
in Regeneration Mode.
This status message is self-clearing. When the
condition is no longer present, the alarm and any
control activity tied to the alarm reverts to normal.
Under normal circumstances, none.
If this message is active, and there is no clear
reason why the UPS is in Regeneration Mode,
contact your factory-authorized service provider.
Regen Failure
Regeneration Mode was initiated and terminated
because of an abnormal condition.
Once Regeneration Mode is active, any condition,
for example an Inverter Overload, other than the
user manually stopping Regeneration Mode,
causes this message to appear.
Regeneration Mode is a service mode that is
normally controlled by the service technician.
Regeneration Mode Status or Alarm messages
are generally intended for the service person.
This status message informs the user the UPS is
in Regeneration Mode.
This status message is self-clearing. When the
condition is no longer present, the alarm and any
control activity tied to the alarm reverts to normal.
Press “SILENCE” to silence the audible alarm.
Press “RESET” to attempt to clear the alarm.
If Regeneration Mode was not manually initiated by
service, or if this alarm will not reset, contact your
factory-authorized service provider.
Table 7 Liebert NXL alarm and status messages (continued)
Event Message Event Definition Recommended Action