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1. Operation when an Alarm Event Occurs
・Do not immediately press the
this could interrupt power to the load.
On the UPS Unit where the alarm event occurred, turn the
that all front panel LEDs are off before pressing the
time, the load should be in a state that will not result in a problem if the power is cut). UPS
system output is shut off normally by this procedure. Afterwards, the
other UPS Units can be turned OFF to completely shut down the UPS system.
・If the
INV.ON/STAND BY button is pressed by mistake after an alarm event occurs, the
UPS system does not shut down, but switches to the bypass circuit to continue supplying the
load. However, from this state, it cannot switch back to the inverter output. In this case, turn
the
UNIT SW on each UPS Unit OFF to shut down the UPS system completely, then
restart it.
2. Alarm at Startup
・ If an alarm occurs when starting, before pressing the
commercial power may be supplied through the bypass circuit. Do not attempt to change any
wiring at the output side while the
3. Minor Faults in SANGUARD IV Lite
・If an increase in the load causes transition from N+1 to N operation, the F.T. LED turns
OFF at the UPS system side, while "Minor Fault" is displayed in SANGUARD IV Lite. Be
aware that this is not an actual fault.
4. Displaying Battery Test Results in SANGUARD IV Lite
・When battery test results are normal, "Normal" is displayed in SANGUARD IV Lite.
Otherwise, "Undetermined" is displayed, which indicates either a battery abnormality or
interruption of the test.
Other Precautions
INV.ON/STAND BY button when an alarm event occurs, as
UNIT SW is ON.
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Appendix
UNIT SW OFF, and verify
INV.ON/STAND BY
UNIT SW on any
INV.ON/STAND BY
button (at this
switch,
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