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Communication Interfaces
No. Event Description
1 None No set-up.
2 Load On Inverter The UPS works in online mode.
3 Load On Bypass The UPS works in bypass mode.
4 Load On Battery
When the main AC source fails, the batteries supply
power to the critical loads.
5 Battery Low
When the UPS runs in battery mode, battery voltage
is lower than the setup limit (default: 220Vdc).
6 Bypass Input Abnormal
The bypass voltage, frequency or phase sequence
is abnormal.
7 Battery Test Fail
During the battery test, the battery voltage is out of
the setup limit.
8 Internal Comm. Fail
The #n power module’s internal communication is
abnormal.
9 External Parallel Comm. Fail In parallel mode, parallel communication is abnormal.
10 Output Overload
The UPS is overloaded or the UPS shuts down to let
the bypass supply power to the critical loads.
11 EPO Activated
The EPO button is pressed to urgently power off the
UPS.
12 Load On Manual Bypass
The Manual Bypass Breaker or Switch (Q3) is turned
on and the UPS transfers to manual bypass mode.
13 Battery Over Temperature
The external battery cabinet’s temperature is too
high.
14 Output Voltage Abnormal The output voltage is too high or too low.
15 Battery Need Replacement The battery replacement date is due.
16 Bypass Over Temperature The bypass static switch temperature is too high.
17 Bypass Static Switch Fault The bypass static switch has an open/ short issue.
18 UPS Over Temperature The UPS temperature is too high.
19 Battery Breaker Shunt Trip
When the EPO button is pressed or low battery
shutdown occurs, the UPS will send a signal to the
connected external shunt trip device to cut off the
battery power.
20 Backfeed Protection
When the UPS’s bypass SCR has an open/ short
issue, the UPS will send a signal to the connected
external shunt trip device to cut off the backfeed
voltage.
21 General Alarm
When any UPS alarm occurs, the UPS will send an
I/O signal.
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