Liebert 100-1000A Manuel D’Utilisation

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Specifications
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15.2.4 Access
The Liebert STS2 is designed so all repairs and maintenance can be done from the front or top of the 
unit. All components that may need repair or replacement during routine field maintenance are 
safely accessed with the units in bypass without removing power from the unit. These components 
include:
• All electronic PCB assemblies
• Power supply assemblies
• All fuses
• All circuit breaker plug-in modules
• Fans
• SCRs
All power connections are designed to maintain proper connection torque over the lifetime of the unit 
without any maintenance. The integrity of the connections can be checked via infrared scanning 
safely from the front or top of the unit.
All other components including power cables and connections, circuit breaker bases, etc. are 
replaceable from the front or top of the unit only, but this requires all power to be removed from the 
unit for safety. Although routine re-torquing of the power connections is not required, if maintenance 
of these connections is needed, complete removal of power is required from the unit for safety reasons.
15.2.5 Circuit Breakers
The Liebert STS2 is equipped with five molded-case, plug-in, non-automatic circuit breakers. The 
breakers are UL-listed for use up to 600 VAC and CE-marked. The plug-in feature of the breaker 
includes an interlock, which prevents the breaker from being unplugged without being in the OFF 
(open) position. 
Mechanical interlocks are provided on the breakers to prevent improper maintenance bypassing of 
the solid-state switch. A bypass breaker cannot be closed unless the solid-state switch is connected to 
the same input source and only one bypass breaker can be closed at a time. All breakers are equipped 
with N.O. and N.C. auxiliary switches for monitoring of the breaker positions. The two input breakers 
for the solid-state switching devices also are equipped with 48 VDC shunt trips to allow for control by 
15.2.6 Cable Entrance
Removable conduit termination plates are provided in the top and bottom of the Liebert STS2 for 
termination of the two source input conduits or raceways and/or the output conduits or raceways. 
15.2.7 Doors
A removable key lock hinged front door provides access to the circuit breakers.
15.2.8 Color Graphical Display or LED Display
The display is located in the front of the unit. Front panel display is either an LCD touch screen 
display for monitoring and configuring the unit, or an LED panel to monitor the unit’s status. 
See Figure 30 for a drawing of the touch screen display. See Figure 62 for the layout of the LED 
display. 
!
WARNING
Lethal voltages exist inside the unit during normal operation. Only qualified service 
personnel should perform maintenance on the static switch.
The unit is supplied by more than one power source. The unit contains hazardous voltages if 
any of the input sources is ON, even when the unit is in bypass. To isolate the unit, turn OFF 
and lock out ALL input power sources.
Verify that all input power sources are de-energized and locked out before making connections 
inside unit.