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4.2.5 AC Auxiliary Control Power Supply Connections
The AC auxiliary power supply connections to the Liebert FS are made through the auxiliary power
fused disconnect on the mounting plate above the inductor-capacitor module and to the right of the
optional VIB and DCM modules (see Figure 30). See Appendix F.0 - Auxiliary Backup AC
Power Supply for details on the purpose of the auxiliary AC power supply.
Figure 30 Service panel location
The Auxiliary Power Fused Disconnect (see Figure 31) accommodates the connection of an AC wire
(Line, Neutral, Ground) and is rated for 110/230 VAC - 50/60 Hz. Open the circuit while wiring, check
the fuses and then close it. The AC wire must be connected to the auxiliary power fused disconnect
from the top to a dedicated AC circuit rated for 400VA with branch circuit protection. This AC outlet
must be connected to a protected low-voltage (110VAC-230VAC, 400VA) source. A qualified electrical
contractor should make this connection permanent.
The AC wire is field-supplied. It must conform to all applicable local, regional, national regulations,
such as the National Electric Code for USA. An 18 AWG (0.82 mm
2
) cable is recommended for this
connection.
Tighten the connections for the 18 AWG cable (0.82 mm
2
) to 15 inch-pounds (1.6N-m).
Figure 31 Auxiliary backup power connections
!
CAUTION
The AC power supply must remain connected at all times. Precautions must be taken to
ensure that the connection is not broken. Disconnection may cause damage to the equipment.
Service Panel (cover removed);
Provides access to fused disconnect
and the optional VIB and DCM.
AC Auxiliary
Power Fused
Disconnect
Location of MCM
(cover plate
removed)