OnLine Power Battery Backup System - Manual (Page 27)

OLP
Three Phase UPS Systems
1. SYSTEM OVERVIEW
1-23
E. Bypass LED: This LED will light 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 light when the reserve breaker is closed, and there is
AC power supply present at the reserve terminal.
G. Rectifier LED: This LED will light when the rectifier is operating normally,
meaning the rectifier Mains are within the range specified, the rotation sequence
of three phases is correct, the rectifier breaker is closed, and no high DC voltage
is on the bus.
H. Back-up LED: This LED will light when the UPS is in back-up mode. This is
also as the indicator for battery test result. If the battery test does not pass, this
LED will flash even if the UPS is not in back-up mode, to prompt the user to
change the batteries.
I. Inverter LED: This LED will light when the inverter is switched on, indicating
whether the inverter is running or not.
J. Inverter SS LED: This LED will light when the inverter static switch is turned on
and the reserve static switch is turned off, i.e., the load is supplied from the
inverter. Usually this LED will light 7 seconds after the inverter is switched on.
K. Reserve SS LED: This LED will light when the reserve static switch is turned on
and the inverter static switch is turned off, i.e., 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 be lit simultaneously.
L. Output LED: This LED will light when there is AC power present at the output
terminal. This is an important indication to the user at to whether AC is available
at the output or not.