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Troubleshooting
36
11.1.2 Audible Alarm
An audible alarm will sound in conjunction with the visual indicators to indicate a change in UPS 
operating status. The audible alarm will sound as described in Table 5.
11.2 Troubleshooting
In the event of an issue with the UPS, refer to Table 6 to determine the cause and solution. If the 
fault persists, contact Emerson Channel Support.
Table 5
Audible alarm description
Condition
Alarm
Battery discharge
Half-second beep every 10 seconds
Low battery
Two half-second beeps every 5 seconds
UPS fault, load on bypass
1-second beep every 4 seconds
UPS fault, no power to load
Continuous
Overload
Half-second beep every half second
Battery replacement
2-second beep every 60 seconds
Battery loss
Continuous
Wiring problem
(loss of proper grounding for UPS)
Continuous
Bypass reminder
1-second beep every 2 minutes
Table 6
Troubleshooting table
Problem
Cause
Solution
UPS fails to start when the 
On/Alarm Silence/Manual 
Battery Test button is pressed
UPS is short-circuited or 
overloaded
Ensure UPS is Off. Disconnect all loads and ensure 
nothing is lodged in output receptacles. Ensure loads 
are not defective or shorted internally.
Battery indicator is illuminated
UPS is not plugged in
UPS is operating from battery mode. Ensure UPS is 
securely plugged into the wall receptacle.
UPS input protection fuse has 
blown/opened
UPS is operating from battery mode. Save data and 
close applications. Replace UPS input fuse, then restart 
UPS.
Utility power is out of tolerance
UPS is operating from battery mode. Save data and 
close applications. Ensure utility supply voltage is within 
acceptable limits for UPS.
UPS has reduced battery 
backup time
Batteries are not fully charged
Keep UPS plugged in continuously at least 24 hours to 
recharge batteries.
UPS is overloaded
Check load level indicator and reduce the load on the 
UPS.
Batteries may not be able to 
hold a full charge due to age
Replace batteries. Contact your local dealer, Emerson 
representative or Emerson Channel Support for 
replacement battery kit.
Fault and Bypass indicators 
and all LED segments of 
battery level indicator are 
illuminated
UPS is overloaded or load is 
faulty
Check load level indicator and remove non-essential 
loads. Recalculate the load and reduce number of loads 
connected to UPS. Check load for faults.
Fault and Bypass indicators 
and diagnostic A indicator are 
illuminated
UPS has been shut down due 
to temperature condition; load 
is on bypass power
Ensure UPS is not overloaded, ventilation holes are not 
blocked and room ambient temperature is not 
excessive. Wait 30 minutes to allow UPS to cool, then 
restart UPS. If UPS cannot restart, contact your local 
dealer, Emerson representative or Emerson Channel 
Support.
Fault and Bypass indicators 
and diagnostic B indicator are 
illuminated
UPS internal DC bus 
overvoltage
UPS requires service. Contact your local dealer, 
Emerson representative or Emerson Channel Support.