Operation

Modes

In an installation that does not include a maintenance bypass panel, the UPS has three operation modes: normal operation, battery operation and static bypass operation. If the installation includes a PDU, a PDU-XR, or an external maintenance bypass panel, the mode maintenance bypass operation also becomes available.

Normal Operation

During normal operation, the UPS converts the utility/mains supply to conditioned power for the connected load.

Battery Operation

During battery operation, the UPS provides conditioned power to the connected load from its batteries for a finite period. The UPS transfers to battery operation if the utility/mains power supply fails or is outside pre-defined limits.

Static Bypass Operation

Static bypass operation is a feature that keeps the load supplied directly from the utility/mains supply during different scenarios on the UPS or downstream from the UPS. In static bypass operation, the utility/mains is supplying power to the connected load directly, bypassing all internal UPS functions.

Maintenance Bypass Operation (Optional)

The UPS can be connected to a PDU, a PDU-XR, or an optional external maintenance bypass panel that enables the user to bypass the UPS completely for maintenance purposes that might even include replacement of the entire UPS. The connected load will then be fed directly from the utility/mains supply, and there will in this case be no filtering of the supply or battery backup of the load.

Operation Procedures

Breakers/Switches in the System

Q1 UPS input

Q2 UPS output

Q3 Maintenance Bypass

Q5 Static Bypass input (only in dual utility/mains systems)

Note: If the system does not contain a PDU or PDU-XR, the Q1, Q2, and Q3 switches and the Q5 breaker should be located in an optional external maintenance bypass panel. See the documentation included with the maintenance bypass panel for additional information.

990–3015E-001

Symmetra™ PX48, 96, and 160 kW 400 V 100 kW 208 V Operation

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