Storage; External Protective Devices - Vertiv Liebert EXS Installer/User Manual

2.1.4 Storage

If you do not install the UPS immediately, you must store it indoors and protect it from excessive moisture,
heat, and other harsh conditions. Store the batteries in a dry, well-ventilated environment with a
temperature range of 68°F ~ 77°F (20°C ~ 25°C).
NOTICE
Risk of failure to properly charge batteries can damage the batteries and void the warranty.
Batteries will lose charge during storage. Batteries must be recharged as recommended by the
battery manufacturer every 3 to 6 months, depending on storage temperature:
• At 68-77°F (20-25°C): charge after 6 months in storage
• At 78-86°F (26-30°C): charge after 3 months in storage
• At 87°F or higher (31°C or higher): charge after 1 month in storage.

2.1.5 External Protective Devices

Circuit breakers or other external protective devices must be installed on the UPS input. The following
sections provide general guidance for installation by properly-trained and qualified personnel.
Rectifier and Bypass-input Protection
Overcurrent Protection—Install an appropriate overcurrent protective device should on the utility input
power distribution. Consider the current capacity of power cables and the system-overload requirements
in selection of the input protection and wiring, see Table 2.1 on page 23, and Table 2.2 on page 23.
Dual-Input System Protection—In a dual-input system, install separate protective devices for the utility
and bypass at the utility input power distribution.
Utility/Bypass Back-Feed Protection—the UPS includes back-feed protection in the event of a fault.
Earth Leakage Current—the residual current detector (RCD) for the UPS upstream input power
distribution should be:
• Sensitive to the DC unidirectional pulse (Level A) in the power distribution network
• Insensitive to the transient current pulse
• General sensitivity type, settable: 0.3A ~ 1A
The residual current circuit breaker (RCCB) must be sensitive to the DC unidirectional pulse (Level A) in
the power distribution network, but insensitive to the transient current pulse, see Figure 2.2 below.
Figure 2.2 RCCB symbols
2 Installation and Commissioning
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