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Table 5-1: Main Module and Electronics Modules M1-M4 Active Alarms continued
LCD Display Possible Cause Suggested Action
x Alarms
Fuse Failure
The UPS detects that one or more of
the internal module fuses has failed.
Contact Technical Support for
assistance.
x Alarms
Heatsink Over
Temperature
An electronics module detects a
heatsink over temperature condition.
The detecting module immediately
shuts down to protect its heat sensitive
components.
Check the ventilation grills for
blockage. If the grills are blocked,
remove blockage, switch to
Maintenance Bypass mode, and restart
the system. Verify that the ambient
temperature is less than 40°C (104°F).
If the grills are not blocked and the
problem persists, contact Technical
Support for assistance.
x Alarms
Input AC Over
Voltage
The UPS detects that the input utility
voltage is above the maximum
operating range of about 277 v
(288 v -hysteresis).
If this occurs in a running system, the
system will immediately transition to
Battery mode until valid utility returns. If
this occurs before a system has
entered an online state, its startup
sequence will not complete, and the
system will shut down until valid utility
returns.
If the condition persists, contact an
electrician.
x Alarms
Input AC Under
Voltage
The UPS detects that the input utility
voltage is below the minimum operating
range of about 172 v
(160 v + hysteresis).
If this occurs in a running system, the
system will immediately transition to
Battery mode until valid utility returns. If
this occurs before a system has
entered an online state, its startup
sequence will not complete, and the
system will shut down until valid utility
returns.
If the condition persists, contact an
electrician.
x Alarms
Input Under Or
Over Frequency
The UPS detects that the input
frequency has a greater deviation than
± 5 Hz from the nominal window of
operation.
If this occurs in a running system, the
system will regulate output frequency to
its nominal 50 or 60 Hz. If this occurs
before a system has entered an online
state, its startup sequence will not
complete, and the system will shut
down until valid utility returns.
If the condition persists, contact an
electrician.
continued
5-4 HP Uninterruptible Power System R12000 XR Models User Guide
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