Chapter 2 Single UPS Installation And Commissioning 9
Liebert
®
ITA 16kVA And 20kVA UPS User Manual
When the UPS uses an external battery, you must install a battery protective device (such as fuse or circuit breaker)
in areas near the battery, and use the shortest wiring distance for the connection between the protective device and
the battery.
Storage environment
When the UPS does not need to be installed immediately, the UPS must be stored indoors to be protected from the
excessive moisture or overtemperature environment. The battery requires dry and low temperature, well-ventilated
environment for storage, and the most suitable storage temperature is 20°C ~ 25°C.
Warning: battery hazards
During the battery storage, the battery must be periodically charged according to the battery instructions. When charging the
battery, you can connect the UPS to the mains temporarily to charge and activate the battery.
2.2.3 Installation Tools
Prepare installation tools according to Table 2-1. The tools must be insulated and ESD-proof processed prior to use.
Table 2-1 Installation tools list
Installation tool
Specification
Application
Cross screwdriver
EJ5100mm
Remove the screws of the top protective cover of the UPS, or open
the chassis
Slotted screwdriver
EJ375mm
Connect I/O cables
Wire-pressure plier
YT-12
Press wires for I/O terminal block
Diagonal plier
MTC3C
Make I/O cables
2.3 External Protective Devices
The circuit breaker or other protective devices must be installed at the external AC input end of the UPS. This section
provides the general guidance for qualified installation engineer. The qualified installation engineer should learn about
the local wiring regulations and other related information.
2.3.1 Rectifier And Bypass Input
Overcurrent
The appropriate overcurrent protective device should be installed on the mains input power distribution, and the
current capacity of power cable and the system overload requirements should be taken into account in installation
(see Table 2-2). It is recommended to use the thermomagnetic circuit breaker which satisfies with IEC60947-2
tripping curve C (normal) when the current value reaches 125% of the current value listed in Table 2-2.
Split-bypass
When the system uses split-bypass, separate protective devices should be installed for the mains and bypass at the
mains input power distribution.
Main/Bypass backfeed protection
When using the main/bypass backfeed protection function, you need to install a protective device with auxiliary
contact function at the user’s gross mains input air breaker (including the main input and bypass input), and this
auxiliary contact signal should be connected to the dry contact port of the system. The recommended model for the
air breaker is S1N125 R125 TM FFC 4P + 1A + 1B + YO (220Vac).
Note
1. The same neutral line must be used for the rectifier and bypass input power.
2. For IT power grid system, the quadrupole protective device must be installed at the UPS external I/O power distribution.
Earth leakage current
The residual current detector (RCD) for the UPS upstream input power distribution should be:
