Chapter 5: Installation
P/N 3101890-EN • REV 006 • ISS 21JUN18 81
NAC/AUX power circuits
The PS10-4B provides four 24 V Class B NAC/AUX power circuits. The NAC/AUX terminal marking indicates
signal polarity when the circuit is active. Polarity reverses when the circuit is not active. For a list of devices you
can connect to special application circuits, see the compatibility list referenced on the control panel.
For notification appliance circuits only, adding an optional CLA-PS10 Class A Adapter card converts the four
Class B NAC/AUX power circuits on the PS10-4B power supply card to Class A. See the CLA-PS10 Class A
Adapter Card Installation Sheet (P/N 3101776-EN) for connecting field wiring and for specifications.
Class B or Class A NAC/AUX circuits configured as NAC outputs are supervised and power-limited. Route power-
limited wiring on the right side of the cabinet, as shown in Figure 21 on page 79. For proper circuit supervision,
break the wire run at each notification appliance and do not loop wires around notification appliance terminals.
Note: NAC/AUX circuits configured as auxiliary power outputs must be turned on and off using a startup
correlation. For example, a correlation is needed to turn them off during an AC power failure if they are powering
non-life safety devices and you want to preserve battery life.
VM-ELEC chassis hardware and operator layer components
WARNING: Electrocution hazard. To avoid personal injury or death from electrocution, remove all sources of
power and allow stored energy to discharge before installing or removing equipment.
Caution: Circuit boards are sensitive to electrostatic discharge (ESD). To avoid damage, follow ESD handling
procedures.
The VM-ELEC Chassis Electronics Assembly provides the mounting, internal power, and audio and data
distribution for the VM-CPU Main Board, VM-LCD User Interface, the VM-DACT or VM-SLCXB hardware layer
option card, and up to three operator layer D12LS-VM Control-Indicating modules. The main board and user
interface are preinstalled on the chassis, as are three blank filler plates. The blank filler plates are used to cover
empty card spaces when control-indicating modules are not used.
Figure 23 shows hardware and operator layer components installed on the chassis. In the figure, the hardware
layer shows the VM-CPU Main Board installed in the first three slots on the chassis and a VM-DACT or
VM-SLCXB next to it. The operator layer shows the VM-LCD User Interface, which attaches to the main board,
and three optional D12LS-VM control-indicating modules. See the VM-ELEC Chassis Electronics Assembly
Installation Sheet (P/N 3101780-EN) for connecting field wiring and for specifications.
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