SMARTZONE UPS INSTALLATION MANUAL
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All 3-phase UPS units may optionally be configured into a Parallel Mode system. The
following Figure shows the high-level power and control connection diagrams of the
Parallel Mode UPS system. A Parallel Mode system allows two to four UPS units of the
same SKU to be connected in parallel.
Note:
Initial release of the product only allows
two UPS units to be connected in parallel. The parallel mode allows the group of UPS
units to behave as one large UPS system.
Note:
There are critical restrictions for
connecting these units in parallel.
Figure 72: Parallel System Power/Control Connections
To ensure that all UPS units in the system are equally utilized and comply with relevant
wiring rules, follow the requirements below:
•
All UPS units in the system must be same SKU.
•
All UPS units in the system must be connected to the same Input Mains source.
•
All UPS units in the system must be connected to the same Input Bypass source.
•
All UPS units in the system must be connected to a common output bus.
•
The length and specification of all UPS power cables (mains input, bypass input
and the output cables) must be the same type and same length. This helps to
facilitate load sharing between the UPS units when operating in all working modes.
•
The UPS units should be physically located near each other to minimize the load
sharing effects due to environmental conditions.
Parallel Mode Wiring
Following the power and control wiring as indicated in Figure 72.
1. Connect the UPS Parallel System to the input source:
a.
Before wiring together, make sure each UPS input breaker is in the “OFF”
