7. Alarm for abnormal input voltage
A) During Start-up, the Line LED will flash if the input voltage drops below 185V or above 261V. Pressing the “|”
button will not switch the UPS from Bypass Mode to Inverter Mode.
(B) During operation, the UPS will switch from Inverter Mode to Battery Mode if the input voltage drops below 170V or
above 276V.
(C) In Battery Mode, the UPS does not change mode even if the line power recovers when voltage is below 170V or
above 276V. If voltage is between 185V and 261V, the UPS will switch back to Line Mode.
Fig. 3.7-1 Bypass Mode Fig. 3.7-2 Battery Mode
8. Battery Mode over-voltage alarm
When the battery voltage exceeds 300V, the alarm will sound continuously and show the display below:
Fig. 3.8-1 Bypass Mode Fig. 3.8-2 Inverter Mode
NOTE: In Battery Mode, the batteries are discharging, hence no alarm sounds.
9. Bypass STS short alarm
The system will detect if the bypass STS gets shorted when the line breaker is turned on. If the STS short is detected,
the display shows as below and the alarm sounds continuously.
Fig 3.9 Bypass Short Alarm
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