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Magnum XS 450 Power System –48 VDC User’s Manual Page 14
Merlin Gerin 28 Circuit Breaker Module Installation
WARNING: Hazardous energy levels are present on bare conductors in
the -48Vdc distribution connection area of the plant. Accidental shorting of
distribution conductors can cause arcing and high currents that can cause
serious burns or other physical harm. It is recommended that:
• Remove any jewelry, rings or watches while working on this
equipment.
• Use insulated wrenches, screwdrivers, cutters, pliers and other
tools.
The Merlin Gerin 28 Circuit Breaker Module requires two adjacent open module positions.
The wiring support bracket is mounted directly above the Merlin Gerin 28 Circuit Breaker
module. Position the wiring support bracket in the top open position. Use M5 hardware to
secure the front lip of the wiring support bracket above the to the power system frame.
Connect the two alarm cables to the controller backplane.
Figure 3.5-1 28 Circuit Breaker Module
Position the circuit breaker module below the wiring support bracket. Insert the module in
the power system such that the holes in the module dc bus line up with the holes in the
power system dc bus. Use M8 hardware to secure the buses together. Use M5 hardware to
secure the front lip to the power system frame. Use M6 hardware to secure the rear of the
module to the power system frame.
Connect the LVD power wiring to the power bus observing proper polarity. Connect the LVD
control cable to the customer interface card.
The alarm signal of each individual circuit breaker [see Installing circuit breaker wiring
(both types of circuit breaker modules)
for specific alarm cable wiring instructions] is
connected to a terminal block on the CB Interface Board (mounted directly above the circuit
breaker module). Each alarm wire is placed in the terminal block position with the number
corresponding to the position of the circuit breaker in the system. The CB Interface Board is
connected to the controller via a 50-conductor cable that plugs into the J3 connector on the
CB Interface Board. The 50-conductor cable splits into (2) DB-25 connectors that plug into
connectors PL1A and PL1B on the controller backplane.