Light Emitting Diode (Led) Functions; Light Emitting Diode (Led) System Status - Toshiba 4200 series Operation Manual

6.8

Light Emitting Diode (LED) Functions

The following list describes the conditions necessary for each LED lamp to be "on".
This green LED lamp is "on" when the UPS is not in an input over-voltage condition, input
under-voltage condition, or power failure state. If there is an input power failure, this lamp is
"off". If there is no power failure and the input voltage is in an over-voltage condition, the AC IN
lamp will flicker on and off rapidly (0.4 sec "on" and 0.4 sec "off"). If there is no power failure
and the input voltage is in an under-voltage condition, the AC IN lamp will be "off".
This green LED lamp is "on" when the UPS unit's inverter is operating.
This green LED lamp is "on" when the UPS is in the static bypass mode.
This green LED lamp is "on" when the UPS is in the battery-discharge mode. If the battery is
low during a battery discharge, the BATT lamp will flicker on and off slowly (1.2) sec "on" and
1.2 sec "off"). The BATT lamp will go "off" if the battery voltage reaches the shutdown level
during the battery-discharge mode.
This red LED lamp is "on" when the UPS is in a fault condition.
6.8.1

Light Emitting Diode (LED) System Status

The following chart shows the UPS system status that can be determined by
decoding the "on" and "off" condition of the LED lamps. It should be used in
conjunction with the LCD display (see Section 6.9) and the audible alarms (see
Section 6.7) for total system monitoring.
LED
Normal UPS Operation
(UPS on-line, no abnormal conditions)
AC IN
INV
BYP
BATT
FAULT
Bypass operation; UPS Fault
AC IN
INV
BYP
BATT
FAULT
Battery Back-up; (Battery Voltage Low)
AC IN
INV
BYP
BATT
FAULT
TOSHIBA
ON/OFF STATUS
ON
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON (Blinking)
OFF
25
LED
Output Shutdown
(After Emergency Power Off received (EPO))
AC IN OFF
INV OFF
BYP OFF
BATT OFF
FAULT OFF
Fatal Communication Error
(Display to Control Interface)
AC IN
INV
ALL ON OR FLICKERING
BYP
BATT
FAULT
ON/OFF STATUS
RAPIDLY