Circuit-Bypass Mode - Toshiba Black Gold TB Series Operation Manual

5.0 Operating the UPS
5.1 Operation Modes (Contd.)
5.1.3

Circuit-bypass Mode

MCCB1
Input
Power
Input
Xfmr
Power flow in circuit-bypass mode for the 2000VA 120V BLACK GOLD TB
Model
MCCB1
Input
Power
Input
Xfmr
(230V)
Power flow in circuit-bypass mode for the 2000VA 230V BLACK GOLD TB
Model
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.
The energy flow must be transferred manually from the UPS bypass
circuit back to the inverter circuit after first correcting the fault. Toggle the
STOP/RUN switch (on the unit's front panel) first to STOP and then back to RUN.
This procedure resets the UPS and transfers back to inverter. On the front panel,
the LED labeled "FAULT" should be off. The "INVERTER" LED and "AC LINE"
LED should be on (See Section 5.4 Front Panel Layout).
TOSHIBA
Bypass circuit
CHP INV
+
-
Batteries
Bypass circuit
CHP INV
+
-
Batteries
MCCB
2
3
4
Power
Flow
MCCB
2
3
Output
Xfmr
4
(230V)
Power
Flow
15