TOSHIBA
17
5.0
Operating the UPS
5.3
Operation Monitoring
5.3.1
Visual Indicator Functions
The following LED (light emitting diode) indicators are located on the front panel
(See Section 5.4 Front Panel Layout). Refer to these lamps for visual information
about the operating condition of the UPS (See Section 5.3.3 “Visual and Audible
Indicator Function Chart”).
1) AC LINE: This green LED lights when normal ac input power is being
supplied to the UPS unit.
2) INVERTER: This green LED lights when the inverter output voltage is normal.
3) FAULT: This red LED lights when an abnormal operating condition is
detected. Operation of the unit’s inverter is inhibited until the fault has been
corrected and the system reset (See Section 5.10 System Reset).
5.3.2
Audible Alarm Functions
The UPS is equipped with an audible alarm system, which activates under
various operating conditions. Sound patterns are used to indicate these
conditions (See Section 5.3.3 Visual and Audible Indicator Function Chart).
Alarms for the battery backup mode or low battery voltage will stop automatically
when AC input voltage is restored. Alarms for a fault condition will continue to
sound until the UPS has been reset (See Section 5.10 System Reset).
5.3.3
Visual and Audible Indicator Function Chart
Condition
Cause
Audible
Alarm
Pattern
Visual
Indicators
UPS
Operation
Overcurrent (OC)
Problem in chopper or
inverter circuit.
DC Bus Overvoltage (DCOV)
Vout > 115% of rated.
Output Overvoltage (OV)
Vout > 110% of rated.
Undervoltage (UV)
Vout < 85% of rated.
Overheat (OH)
Heatsink exceeds 90º C.
Overload (OL)
Output current and over-
load specifications have
been exceeded.
Battery problem
Problem in battery
circuit.
1) “Fault” LED
is ON
2) “Inverter
LED is OFF
3) “AC Line”
LED is ON
1) Auto
transfer
to
bypass
2) Chopper
stopped
3) Inverter
stopped
Normal battery backup
operation
Loss of AC power
Low battery voltage
(voltage less than 90%)
Battery voltage too low.
1) “Fault” LED
is OFF
2) “Inverter”
LED is ON
3) “AC Line”
LED is OFF
1) Chopper
running
2) Inverter
running
ON
OFF
2s
1.5s
ON
OFF
.5s
.5s
ON
OFF
1s
2s
ON
OFF
1s
.5s
ON
OFF
70s
5s
