Emerson Liebert NXL 250 kVA, Operation And Maintenance Manual

Page: 101 / 112

UPS Alarm and Status Messages
93 Liebert
®
NXL
™
Main
Control
Fault
The UPS has transferred to Bypass due to a loss
of communications with the Main Controller.
All Transfers, Startup, Shutdown, and Metering
screens are locked out.
The Controls attempt to reestablish
communications but will not return the load to
inverter automatically
Press “SILENCE” to silence the audible alarm.
Contact your factory-authorized service provider.
If communications are reestablished, the One-Line
Display will be restored; however, Liebert does not
recommend attempting to return the load to
inverter until a service visit has been made and
action taken to determine why the fault occurred.
Action will involve resetting the UPS controls by
removing and then reapplying control power.
Therefore, it will be necessary to utilize
maintenance bypass by closing the optional
external Maintenance Bypass Breaker (MBB).
Emerson recommends that the user or operator
speak with an authorized service associate from
Emerson before attempting this operation.
Maintenance
Bypass Breaker
(MBB) Open
The maintenance bypass breaker indicates that
it is in the open position
Maintenance
Isolation Breaker
(MIB) Open
The maintenance isolation breaker indicates that
it is in the open position.
Man
Rexfer
Inhibit
This summary event means the conditions
required to perform a manual transfer to Inverter
(online) are not met (Inverter must be in sync
with bypass).
This status message is self-clearing. When the
condition is no longer present, the message and
any control activity tied to the status event
reverts to normal.
The condition clears from the Active Event Window
when manual re-transfers are enabled.
A possible reason for this condition is an unstable
generator. If the generator frequency is not stable,
or not at 60 Hz, the Inverter may have difficulty
maintaining or acquiring synchronization with the
bypass source.
To check the synchronization of the Inverter to
bypass, click “Transfer” and observe the
synchroscope. A non-sync condition is indicated by
a varying phase angle error, rather than a stable
“0” degree indication.
If the unit is not on generator, and the bypass
voltage otherwise appears normal, contact your
factory-authorized service provider.
Parametric Data (Note 1)
Bit Reason
0x0001 Transfer to UPS Inhibited Internally (SCR
Open, SCR Shorted, MBB & MIB Both Closed)
0x0002 Inverter not Ready (Inverter Walking In or
Inverter not Qualified or Bypass not Synchronized)
0x0004 Pulse Parallel Active
0x0008 Bypass to Output Phase Error
0x0010 Critical Bus not Qualified
0x0020 Not Enough Inverters Available to Support
the Load
0x0040 Phase Error Exceeds Manual Transfer
Limit Setting
0x0100 Kirk Key Inserted
0x0200 BPSS Board has Failed
0x0400 MBB & MIB Both Closed
0x0800 Bypass Sync Error
0x1000 Inverter not Qualified
0x2000 Inverter in Walkin
0x4000 Loss of Sync Pulse
0x8000 Critical Bus in Overload
Table 10 Liebert NXL alarm and status messages (continued)
Event Message Event Definition Recommended Action