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Liebert
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BDC
™
46
5.1.1 Bypass Mode
When the Liebert BDC is in Bypass mode, it provides an alternate path for power to the connected
equipment. Should the UPS need to be taken out of service for limited maintenance or repair, manual
activation of the bypass will cause an immediate transfer of the equipment from the UPS inverter to
the bypass source. In this mode, power will still be supplied to the UPS; however, the load is NOT
protected by the UPS.
5.2 Maintenance Mode
When the Liebert BDC is in Maintenance mode (MBB closed; BIB/MIB open), it provides an alternate
path for power to the connected equipment should the UPS need to be taken out of service for limited
maintenance or repair. In this mode of operation, no power is supplied to the UPS and the load is
NOT protected by the UPS.
5.3 Locating the Cabinet
This Liebert BDC may be mounted to the left of the UPS or installed as a stand-alone unit. In either
case, ensure that the unit is in a well-ventilated area and that there is clearance for access to the
switches and cable connections as required by national and local codes.
5.4 Cable Installation
5.4.1 Wiring Preparation
Be sure that the unit is not connected to any AC utility power source or UPS before installing any
wiring to this unit. This Liebert BDC should be installed by a qualified / certified electrician.
Removing the Cover Plates
Plates cover the input and output terminals on the front of the Liebert BDC (see Figure 26). Remove
these and keep the screws and plates for reinstallation.
Figure 26 Liebert BDC—access plate removed
!
WARNING
Risk of electrical shock and arc flash. Can cause property damage, injury and death.
Read this section thoroughly before attempting to install wiring to this unit. Read and
comply with all warnings and cautions in this manual.