User Manual NS1500/2200/3000-1T
17
Rev. 11/2005
Problem
Possible Cause
Action Code
After AC connected
to UPS, alarm
sounds short and
fast beeps and UPS
shut down
AC abnormal
Check utility power
1001
AC noise or environment noise
Check utility power or battery
wires
1101
After starting the
UPS, alarm sounds
short beeps
continuously, then
the UPS shuts down
UPS PSDR PCB abnormal
Call for service center
1102
Internal overheating
Check the ventilation
1201
Five short beep
continuously
Fan failure
Call for service to replace the fan
1202
Four short beep
continuously
PFC over load protect in action
due to low AC input
check input AC power or release
some load
1301
AC input is abnormal due to
input voltage and UPS goes into
DC mode
Disconnect input AC power and
check
1401
LINE LED not lit after
connection to utility
power and BOOST,
INV LED lit with three
short beep
continuously
Input switch not turn on
Turn on the input switch
1402
