Vertiv Liebert ITA2-08KRT208, Руководство пользователя, Страница: 22 / 74

Vertiv | Liebert
®
ITA2
™
User Manual | 16
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 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 power distribution network, but insensitive to the transient current pulse, as shown in
Figure 10 .
Figure 10 RCCB symbols
When using the earth RCD in a split-bypass system or parallel system, the RCD should be
installed at the upstream input power distribution end to prevent false alarms.
The earth leakage current fed by the RFI filter in the UPS ranges from 3.5mA to 100mA. Vertiv
recommends verifying the sensitivity of each differential device of the upstream input power
distribution and downstream power distribution (to load).
2.4.2 Battery Input
Battery cabinets provided by Vertiv have a built-in overcurrent protective device.
2.4.3 UPS Output
A protective device must be installed for the UPS output power distribution.
2.5 Mechanical Installation
The Liebert ITA2 may be installed in a tower or rack configuration. If the installation includes
batteries or a Maintenance Bypass Cabinet review the user manuals for those components
before beginning to install the Liebert ITA2 UPS. The MBC and battery cabinets should be
installed before the UPS is installed.
2.5.1 Tower Installation
1. Assemble a pair of support bases and a support base extension, as shown in Figure 11 .
2. Put the assembly on a flat installation surface.