OPTI-UPS DS160KD33 - Manual (Page 27)

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EMERGENT STOP - beep continuously
The buzzer will also beep once every time the inverter is switched on or off to
acknowledge the user his key is valid and accepted.
E. Bypass LED: This LED will lit when the maintenance bypass breaker is closed.
When the maintenance bypass breaker is closed, the inverter cannot be switched
on and will stop immediately even when inverter is already running.
F. Reserve LED: This LED will lit when the reserve breaker is closed, and there is
AC power supply present at the reserve terminal.
G. Rectifier LED: This LED will lit when the rectifier is operating normally, it
means the rectifier Mains is within the range specified, the rotation sequence of
three phases are correct, rectifier breaker is closed and no high DC voltage in the
bus.
H. Back-up LED: This LED will lit when the UPS is in back-up mode. This is also
as the indicator for battery test result. If the battery test do not pass, this LED will
flash even the UPS is not in back-up mode to prompt the user to change the
battery.
I. Inverter LED: This LED will lit when the inverter is switched on, therefore this
LED indicates whether the inverter is running or not.
J. Inverter SS LED: This LED will lit when the inverter static switch is turned on
and the reserve static switch is turned off. That is, the load is supplied from the
inverter. Usually this LED will lit 7sec. after the inverter is switched on.
K. Reserve SS LED: This LED will lit when the reserve static switch is turned on
and the inverter static switch is turned off. That is, the load is supplied from the
reserve. Since the reserve static switch and inverter static switch will never both
turn on simultaneously, the Inverter SS LED and the Reserve SS LED should
never both lit simultaneously.
L. Output LED: This LED will lit when there is AC power present at the output
terminal. This is an important indication to the user that whether AC is available
at the output or not.