Maintenance Bypass Switch (Not Available For 800/1000/1200Kva) - Vertiv Liebert EXL S1 480V User Manual

Liebert EXL S1
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
5.4. Maintenance Bypass Switch
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 63.
• QS1 = OPEN
• QS2 = OPEN
• QS3 = CLOSED
• QS4 = OPEN
(see Fig. 12, Fig. 13)
Warning
During parallel operation, switching of the load on the built-in Service Bypass must be
performed by an external device (see chap. 6. on page 67).
User Manual 10H52264UM60 - Rev. 6 - 12/2021
Maintenance Bypass
Static Switch
Rectifier
Figure 26 - Liebert EXL S1 block diagram
(not available for 800/1000/1200kVA)
Inverter
Battery converter
Normal and safe operation
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