Vertiv | Liebert EXS 80kVA UPS | User Manual
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Parallel System and LBS System
6.4.7. Procedures for Completely Powering Down UPS
Complete UPS shutdown and load power-off should follow this procedure. All power switches, isolating switches
and breakers are disconnected, and then UPS no longer supplies power to the load.
Caution
The following procedures will cut off the load power, making the load completely power off.
1. Press the remote EPO button of each UPS for 2 secs (if any) or unplug the EPO terminal of each UPS to stop
the operation of all the rectifiers, inverters, bypasses, and batteries.
2. If the UPS is equipped with internal batteries, ensure that they have been isolated from the UPS (see
) before carrying out maintenance work on it. If the UPS is equipped with an external battery, set the
corresponding external battery switch to off.
3.
Disconnect the main input switch Q1, bypass input switch Q2, output switch Q5 of each UPS. At present, all
the internal power supply is closed and the LCD no longer displays.
Warning
The battery terminals still have hazardous voltage after the UPS complete shutdown.
6.4.8. Procedures for Complete UPS Shutdown While Maintaining Power to Load
The following procedures are applicable for completely powering down the UPS and keeping the power supply
to the load. Refer to the procedures in
6.4.4 Maintenance Bypass Procedures
6.5. LBS System
6.5.1. Overview
An LBS system consists of two independent UPS systems, each containing one or more parallel
UPS modules.
The LBS system is highly reliable and is applicable for multiple-input loads. For single-input load, an STS can be
installed to feed power to the load.
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