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Installing Cables for a Single UPS
This section describes how to install cables for one UPS and two lithium batteries. The actual situation may vary.
Installing Power Cables
- Switch off the upstream AC circuit breaker for the UPS.
- Remove the AC input, AC output, and battery input terminal covers from the UPS.
- 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.
- 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): 76 mm x 465 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-.
- When installing a lithium battery power cable, ensure that the protruding part of the OT terminal on the cable faces outwards.
- Do not connect two or more cables to the positive or negative power port of the lithium batteries in parallel.
Figure 3-5 Installing battery power cables
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Figure 3-6 Installing the battery PE cable
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(1) Ground bar |
Figure 3-7 Installing battery cables (rack-mounted, front view)
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(1) Busbar |
Figure 3-8 Installing battery cables (rack-mounted, rear view)
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Figure 3-9 Busbar mounting hole dimensions (unit: mm)
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