20 - 80 kVA parallel UPS system
User’s and Installation Manual
1018390
Revision C
24
Figure 16.
A parallel 4 x UPS configuration with the SPM tie cabinet
Local regulations and installation environment shall be considered when selecting power
cables and fuses/breakers. The recommendations of this manual can be used as a guideline
for the electrical wiring and installation.
Slow gG fuses or C-type breakers should be used for short-circuit protection of the power
cables. The electrical installation shall be dimensioned according to local safety regulations,
appropriate mains voltage and the rated current of the load.
Notice!
Pay attention to the correct phase order when connecting the UPS output and system bypass
cables to the SPM tie cabinet. Phases L1, L2 and L3 must be in the same order when transferring
the load to the system bypass. The correct phase rotation is not enough to prevent UPS
hardware damages. Make also sure that the neutral cable is properly connected in all terminals.
SPM9305/9340-130-2, SPM9305-80-4 and SPM9305-60-4 tie cabinets
The SPM tie cabinet provides the UPS connection terminals for the shared load bus. It also
enables the make-before-break transfer of the load to the system bypass. This can be used
for service or test purposes.
The available SPM tie cabinets have the following maximum power ratings:
X2 and X4 input terminals have a five-wire connection (L1, L2, L3, N, and PE). Power cables
with copper conductors should be used to fit the terminals. The wiring shall be done according
to the wiring diagram. The terminals and cable routing is shown it the figure below.
Auxiliary contact information of the system bypass switch enables a safe transfer of the load.
Pay attention that the signal cable of the bypass switch aux. contact is wired correctly to the
UPS modules: the polarity of the signal must be the same for all parallel connected UPS
modules because the signal sensing is done against the ground.
Notice!
UPS modules should get a minimum of 10 ms leading closed-contact signal when the system
bypass switch is turned from UPS to BYPASS position.
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