Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document.
Note: Even the most advanced machine translation cannot match the quality of professional translators.
Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Installing Cables for Parallel UPSs
- Before parallel running, ensure that all output circuit breakers for each UPS are ON. Otherwise, a UPS fault (error code #72) will occur.
- Batteries must be connected for parallel running.
This section describes how to install cables for two UPSs 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 cover from each UPS.
- Install AC output power cables, AC input power cables, and then battery input cables in sequence.Figure 3-10 AC input, AC output, and battery input wiring diagram (sharing battery strings)Figure 3-11 AC input, AC output, and battery input wiring diagram (not sharing battery strings)
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.
- UPS sharing battery stringsFigure 3-12 Installing the battery PE cable
(1) Ground bar
Figure 3-13 Installing battery cables (rack-mounted, front view)(1) Busbar
Figure 3-14 Installing battery cables (rack-mounted, rear view)
- UPS not sharing battery stringsFigure 3-15 Installing the battery PE cable
(1) Ground bar
Figure 3-16 Installing battery cables (rack-mounted, front view)(1) UPS rear view
Figure 3-17 Installing battery cables (rack-mounted, rear view)
