Toshiba 1400 Plus Series, Operation Manual, Page: 19 / 31

TOSHIBA
5.0 Operating the UPS
5.2 System Protection Features (Cont'd)
The following table lists explanations for the protection features for the 500, 600,
750, 800, 1000, 1200, 1500, and 2000 VA UPS units.
5 - 5
Setting level Chopper OC: 140% 120% of rated 85% of rated 150% for 1 90 deg. C or
DC OC: 200% of the voltage (avg.) voltage min. of rated 194 deg. F
main transistor's output current
rating (instantaneous)
Cause Transistor fault (short Control Excessive load Overload; Fan failure;
circuit; load inrush malfunction connected to short circuit at high ambient
current; control UPS output; load temperature
malfunction control
malfunction
Operation Transfer to bypass; Transfer to Transfer to Transfer to Transfer to
mode after stop chopper, INV bypass; stop bypass; stop bypass; stop bypass; stop
fault chopper, INV chopper, INV chopper, INV chopper, INV
Audible alarm None None None Yes None
Visible alarm Fault light Fault light Fault light Fault light Fault light
Item Overcurrent Over- Under- Overload Overheat
voltage voltage
(OC) (OV) (UV) (OL) (OH)
UPS Protection Features
5.3 Front Panel Indicator LED Functions
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 overcurrent, overvoltage, overload, or
overheating problem is detected. Operation of the unit's inverter is inhibited until
the fault is corrected and the system is reset. Refer to Section 5.2 "System
Protection Features" for details.
The UPS unit's batteries provide about 10 minutes of back-up time for the 500
through 1200 VA capacity units and about 8 minutes of back-up time for the
1500 through 2000 VA capacity units. These times are valid when the unit is
operating under full load. When the units are operating at half load, the batteries
can power the load equipment about 3 times longer. The exact length of these
times will depend on the UPS model used, condition of the batteries, amount of
load, temperature and other variables. See battery backup time in the standard
specifications Sections 4.1 and 4.2.
5.4 Battery Backup Time