Troubleshooting
HP UPS R12000 XR Models Maintenance and Service Guide
5-7
HP CONFIDENTIAL
Codename: Sierra Part Number: 221273-001 Last Saved On: 7/31/02 8:59 AM
Table 5-1: Main Module (MM) and Electronics Modules (M1-M4) Active Alarms
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LCD Display
Possible Cause
Actions to Take
x
Alarms
Level 4 Overload –
Phase A
The UPS detects that the current load
has exceeded 120% of the maximum
capacity available, which means that it
is operating in Nonredundant mode.
The UPS transfers to Bypass mode
within one second and remains in that
mode due to the excessive overload
condition.
•
Reduce the load level to clear the
alarm. If the alarm persists after
load reduction, refer to the LCD
panel to determine which
electronics module is reporting
overload.
•
During overload, switch to Manual
Bypass mode. Replace the faulty
module.
x
Alarms
Loss of
Redundancy
The UPS detects that the current load
level has exceeded the maximum safe
load level limits that would provide
redundant protection to the electronics
modules.
The system continues to operate, but is
no longer in Redundant mode. The
load could be at risk if an electronics
module fails.
If you still want redundant operation,
reduce the load until the alarm clears.
x
Alarms
Loss of Sync-Bus
The UPS detects that its electronics
modules are having trouble
synchronizing with the input utility
source.
The most likely cause is a poor utility
source supplying the UPS.
•
Switch to Manual Bypass mode,
and restart the system.
•
Verify that the input source is
stable.
x
Alarms
Low Battery
Shutdown
While on battery, the UPS detects that
the battery voltage level has dropped
below the lowest preset threshold
value. The UPS shuts down.
This normal alarm condition occurs at
the end of a battery discharge cycle.
The threshold represents the lowest
allowable battery discharge level for the
batteries before they can no longer
safely support the load. After valid
utility returns and a minimum charge
level has been restored to the batteries,
the UPS assumes the load and begins
a complete battery recharge cycle.
This is a normal operation.
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