TOSHIBA
5.0 Operating the UPS
5.1 | Operation Modes |
|
|
|
| 5.1.3 | *Isolation only | UPS | |
|
|
| ||
|
| Bypass circuit | for 1500 plus | receptacles |
|
| series (600VA) | (rear panel) | |
|
|
| ||
Power |
|
|
|
|
input plug | Fuse | UPS |
|
|
|
|
|
| |
|
| main |
|
|
|
| circuit |
|
|
Input |
| Output |
| |
|
|
| ||
| Transformer |
| Transformer | |
|
|
|
| |
+
UPS batteries | = power flow |
-
Power flow in
If the UPS unit is severely 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 changeover 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's 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. During circuit- bypass mode the
5.2System Protection Features
The schematic shown below depicts the electrical locations of the protection devices on the UPS.
| Input | Overcurrent |
|
|
|
|
| Abnormal |
|
|
|
| |
|
|
|
|
|
| |
|
|
|
|
|
| *Isolation only |
|
|
|
|
|
| for 1500 plus |
|
|
|
|
|
| series (600VA) |
| Fuse | Rectifier/ |
|
|
| |
Input |
| Inverter |
| Output | ||
| Charger/ |
| ||||
|
| Chopper |
|
| Output | |
|
|
|
|
|
| |
|
| Input |
|
|
| Output |
|
| Transformer |
|
|
| Transformer |
|
|
|
| + |
|
|
|
|
|
| Batteries |
|
|
|
| Low Battery | Overheating | Current Limit | Overvoltage/ | |
|
| Level | Overload | Undervoltage | ||
|
|
|
| |||
5 - 2