Liebert BDC
™
Liebert
®
APM
™
58
6.3
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.
6.4
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.
6.5
Cable Installation
6.5.1 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
). Remove
these and keep the screws and plates for reinstallation.
Figure 44 Liebert BDC—access plate removed
6.5.2 Power Cable Installation
when selecting cables.
!
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.
NOTE
Transient and steady state earth leakage currents may occur when starting the equipment.
This should be taken into account when selecting ground current detection devices because
these will carry the earth leakage currents of both the UPS equipment and the load.