Operating Instructions; Introduction; Power Switches - Liebert Hinet 10kVA User Manual

Hinet UPS User Manual

5 Operating Instructions

5.1

Introduction

This chapter describes the switches used by the Operator and the second part contains detailed operating instruction. The
UPS can be considered to be in one of following operating conditions:
?? Normal operation - The load is powered by the UPS. The inverter and the battery charger are ON
?? On Maintenance Bypass - UPS shut down but the load connected directly to the unprotected mains via the
Maintenance Bypass Supply line.
?? Power off - All power switches open and the UPS is isolated from the mains supply - no power is feeding the
load.
?? On battery – UPS is running on battery.
?? On Bypass - The load power is supplied by the bypass line. The battery charger remains ON during this phase
but the inverter is turned off.
5.2

Power Switches

The UPS can be insulated by means of power switches, accessible after opening the front door.
Hinet's power switches panel is situated on the front panel purposely hidden from sight to prevent unintentional or
accidental operations. It comprises all the switches used to activate/ deactivate Hinet.
The location of the UPS power switches is shown in Figure 5-1.
The UPS power switches are:
?
- INPUT MAINS SWITCH: connects the UPS to the mains input supply.
?
- RESERVE SWITCH (Bypass): connects the UPS to the bypass supply.
?
– MAINTENANCE SWITCH permits supply of the load directly by the bypass line for maintenance.
The lever of this switch is normally set to the bottom position (By-pass excluded). The manual bypass switch is
protected against unintentional operations through a mechanical lock that can be additionally provided with a pad-
lock for further protection. It is utilised in all those circumstance whereby Hinet has to be excluded while still
keeping the load powered from mains.
The UPS input power terminals, output (load) terminals, and battery terminals still carry dangerous voltages
when the UPS is operating in the maintenance bypass mode. Internal access to the UPS must be restricted to
trained personnel.
?
- OUTPUT SWITCH: connects the output of the UPS to the load.
?
- BATTERY FUSES SWITCH: connects the battery to Hinet's inner circuitry.
This manual fuse-holder switch isolates the battery positive of Hinet (so facilitating maintenance operations) and also
contains four fuses whose function is to protect the battery line against short-circuits.
WARNING
Figure 5-1 Power switches panel
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