Chapter 1 Installation Of UPS Module 7
NXr UPS Module And Parallel System 30kVA ~ 200kVA User Manual
2. Non-linear loads (switch mode power supplies) affect the design of the output and bypass neutral cables. The current
circulating in the neutral cable may exceed that of the nominal phase current by up to 70%.
3. Values shown for 30 x 6-cell 12V blocks per battery string. Each string may contain from 30 to 40 x 6-cell 12V blocks. Inverse
proportional values apply with more blocks per battery string. E.g. The max discharge current from a 40 x 6-cell 12V battery applied
to a 30kVA NXr is 105A x (30/40) = 78A
1. Protective earth cable: Follow the most direct route possible to connect the earth cable to the cabinet. The earth
cable shall be sized in accordance with the AC supply fault rating, cable lengths and type of protection. E.g. typical
cross sectional area (CSA) is 70mm
2
(150kVA) according to AS/IEC60950-1 Table 2D.
2. When sizing the battery cables, a maximum volt drop of 4Vdc is permissible at the current ratings given in Table
1-1. The load equipment is generally connected to a distribution board containing individually protected busbars
rather than connected directly to the UPS output. The output cables from paralleled units to the parallel distribution
bus should be of the same length to optimise the sharing of current. Do not form coils, so as to minimize the
formation of electromagnetic interference.
3. For terminal location, refer to Figure 1-4 ~ Figure 1-6.
Warning
Failure to follow adequate earthing procedures may result in electromagnetic interference or in hazards involving electric shock
and fire.
1.6.2 Distance From Floor To Connection Point On The Equipment
Table 1-1 Distance from floor to connection point on the equipmen
UPS connection point
Minimum distance (mm)
30kVA (NXr 30K-B)
30kVA (NXr 30K) ~ 160kVA
200kVA
Rectifier AC input supply
780
284
284
Bypass AC input supply
685
284
284
UPS AC output
530
369
251
Battery power
375
369
320
Auxiliary cable: to monitoring board (U2)
1104
1104
1304
1.6.3 Cable Connection
Important
The operations described in this section must be performed by authorised personnel. If you have any questions, please contact
the local customer service center of Emerson immediately.
Warning
1. Before cable connection, ensure that you are aware of the location and state of the breaker that connects the UPS input to the
mains distribution panel. Check that this breaker is off, and post any necessary warning sign to prevent inadvertent operation of
the breaker.
2. The power cables should be routed through cable tunnel or metallic cable trough to avoid being damaged under mechanical
stress and reduce electromagnetic interference to the environment.
Once the equipment has been finally positioned and secured, refer to Figure 1-3 to connect the power cables as
described in the following procedures:
Summary of Contents for Liebert NXr
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