Liebert EXL S1 Normal and safe operation
User Manual 10H52226UM60 - Rev. 1 - 01/2017
76
5.3.1. Components
The UPS consists of the following components:
• Rectifier - Provides regulated DC voltage to inverter and booster/charger.
• Inverter - Provides controlled AC output voltage to the critical load
• Battery converter - Charges the battery when line power is present. Supplies the inverter from the
battery when line power is not present.
• Static Bypass Switch
• Maintenance Bypass - Disconnects the Power Module during servicing, without interrupting the
supply to the load
Figure 43 - Liebert EXL S1 block diagram
5.4. Maintenance Bypass Switch (not available for 600/800/1000/1200kVA)
Liebert EXL
S1 is equipped with a Maintenance Bypass Switch (QS3) that allows the user to perform
maintenance on the UPS without interrupting the supply to the load.
Transfer to and from Maintenance must be done in accordance with the procedures 3 and 4 described
in para 5.7. on page 80.
• QS1 = OPEN
• QS2 = OPEN
• QS3 = CLOSED
•QS4 = OPEN
(
see Fig. 19-Fig. 22)
War
ning
During parallel operation, switching of the load on the built-in Service Bypass must be
performed by an external device (see chap. 7. on page 86).
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