Circuit Bypass Mode - Toshiba 1400 Series Operation Manual

TOSHIBA
5.0 Operating the UPS
5.1 Operation Modes (Cont'd)
5.1.3 Circuit-bypass Mode
Power
input
plug
Fuse
5-15P
Power flow in circuit-bypass mode for 500, 600, 750, 800, 1000, and 1200 VA
Models
Power
input
Circuit
plug
breaker
5-20P
UPS batteries
Power flow in circuit-bypass mode for 1500 and 2000 VA Models
If the UPS unit is overloaded or develops an internal fault, the power flow is
automatically switched from the unit's main circuit to the bypass circuit mode.
Power flow through the bypass is shown in the above illustrations. This change-
over occurs automatically in approximately 4 milliseconds. The switching period
is not long enough to cause interruptions to occur in most UPS equipment loads.
After repairing the cause of the inverter shutdown, the energy flow must be
transferred manually from the UPS's bypass circuit back to the inverter circuit.
This is done by toggling the ON/OFF switch (on the unit's front panel) first to
OFF and then back to ON. This action resets (clears) the fault.
Bypass circuit
UPS
main
circuit
+
UPS batteries
_
Bypass circuit
UPS
main
circuit
+
_
5 - 3
receptacles
(rear panel)
Output Xfmr
(Plus Series)
5-15R
= power flow
Fuse
Output Xfmr
(Plus Series)
= power flow
UPS
UPS
receptacles
(rear panel)
5-15R