Chapter 12 – Additional Equipment Liebert Hipulse E User Manual
Single or '1+N' UPS System
Page 12-10 (07/04)
12.8 Input isolation transformer (IT)
Input Isolation Transformers are required in case of having a galvanic isolation between Input/Bypass Mains and UPS
Output. They are normally a Delta/ZigZag (Ì/Z) double wound transformer and they are available for every range of
UPS (80-800 kVA). They are housed in an optional cabinet in which the non automatic circuit breaker with fuses are
also installed. Input isolation transformers are designed to power both rectifier and bypass mains, depending on their
size.
The transformers have 0° phase shift to also allow connection in the bypass line.
The IT cabinet can be positioned alongside the main UPS equipment.
All cabinets are secured and bonded together using the holes provided in the cabinet side struts. Each cabinet is
supplied without side covers, as the cover from the basic UPS is then used. If the cabinet is to be located away from the
UPS, connection cables and side panels will be necessary.
All IT models are cooled with the aid of internal removable fans.
The components of the Input isolation transformer are matched to the UPS capacity, resulting in different part numbers
for each system as follows:
Model P/N Dimensions (WxDxH)
mm.
Weight (kg.) Switches Fuses (A)
300 kVA UPS 5312125N-E 1250 3p – 630A 630 Gr.3
400 kVA UPS 5312126O-E 1450 3p – 1250A 900 Gr.4
1210 x 856 x 1900
Note: Side panels not included.
When the IT is fitted next the UPS is provided with the power connection cables. If for any raison the IT cannot be
fitted next the UPS, please order the optional side panels.
12.9 Degree of protection for the UPS enclosure
The degree of protection for the UPS enclosure satisfies IP 20 standard even in door-opened condition. An option for
IP21/30/31 is also available.
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