3.5 Installing Cables for a Single UPS
Installing Power Cables
1. Switch off the upstream AC circuit breaker for the UPS.
2. Remove the AC input, AC output, and battery input terminal covers from the
UPS.
3. Install AC output power cables, AC input power cables, and then battery input
cables in sequence.
Figure 3-4 AC input, AC output, and battery input wiring diagram
Installing Battery Cables
After lithium batteries are connected in parallel, connect signal cables to the BMS
ports on the UPS. Install a build-out resistor at the COM-OUT port on the last
lithium battery.
NO TE
● The UPS2000-G-3KRTLL needs to connect to external lithium batteries. Each UPS
supports a maximum of eight batteries connected in parallel. This document uses two
lithium batteries connected in parallel as an example.
● The maximum discharge current of a 50 Ah lithium battery is 4 kW.
● The maximum discharge current of a 100 Ah or 150 Ah lithium battery is 4.3 kW.
● When lithium batteries are connected, it is recommended that a DC circuit breaker (63 A
80 V DC circuit breaker for the 3 kVA UPS) be installed between the lithium batteries
and the UPS.
● Before connecting cables to the UPS, ensure that the battery circuit breakers are OFF to
prevent operations with power applied.
● If the UPS shares a battery string, the PE bar and battery busbar are configured.
● If the busbar terminals are insufficient, you can cascade busbars.
● Busbar dimensions (H x W x D): 84 mm x 475 mm x 70 mm
● In the wiring diagram, the busbar RTN+ connects to the battery BTA+, and the busbar –
48 V connects to the battery BAT-.
UPS2000-G-3KRTLL
User Manual
3 Installation
Issue 01 (2020-10-26)
Copyright © Huawei Technologies Co., Ltd.
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