Liebert UPS System user manual United Power Mode, Parallel Operation mode, Dual Input Mode

Chapter 1 Introduction

6. United Power Mode

When the utility is not available and the capacity of the generator set is inadequate to support the load, the battery will power the load together with the generator automatically. The operating time under this mode should not exceed the autonomy time of the batteries, as shown in Figure 1-10

Note :

This mode can only be set by qualified personnel only.

Bypass

Mains ~ --~ output

Figure 1-10

7. Parallel Operation mode

When several UPS units (maximum four units) are in parallel operation mode, they will share the load automatically amongst themselves. If one unit fails, this unit will be shut down automatically and the remaining units will share the load equally. If overload occurs, the UPS will transfer to bypass operation mode. Parallel operation mode also has normal mode, battery mode, bypass mode, maintenance mode and united power mode.

8. Dual Input Mode

The main circuit and the bypass can use the same or different sources. The input methods are shown in Figure 1-11 and Figure 1-12.

Mains

~ -

- ~

output

Fig 1-11

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