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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 nite period. The UPS transfers to battery operation if the utility/mains power supply fails or
is outside pre-dened 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 ltering 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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