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Installation and Maintenance Manual
Connecting Power to the CommCenter System
Operating power is connected to the 300MB through the three-position, field-wiring terminal block located
at the back of the unit. Two knockout openings are provided. One knockout should be removed and provided
with a bushing through which the power lines can be routed into the field wiring compartment.
For 120 Vac Operation
The 300MB is factory-set for 120 Vac operation.
For 240 Vac Operation
See Figure 2 on page 11. Set switch SW1 on the motherboard to the
For 24 Vdc Operation
See Figure 10 on page 15. Terminals TB1-15 and TB1-16 receive a 24 Vdc input. If using 24 Vdc either
as a primary or auxiliary source of power, remove the labeled jumper from terminals TB2-7 and TB2-8 of
terminal block TB2, before using these positions. Connect the " + " terminal of 24 Vdc power supply to the
terminal TB2-8 (+24 Vdc) and "
the TB2 terminal block located in the back of the 300MB. Install a Class II power supply, such as a Federal
Signal PS600, and its associated wiring.
16
QUALIFIED INSTALLERS ONLY — This device is to be installed by a trained
electrician who is thoroughly familiar with the National Electric Code and will
follow the NEC guidelines as well as local codes.
SHOCK HAZARD — Do not perform any installation or maintenance on this
system when power is on. Because the 300MB does not have a power switch,
ensure that the power is disconnected before proceeding. Failure to heed this
warning may cause serious injury or death.
CROSSTALK/INTERFERENCE HAZARD — Mixing power lines with signal lines
can cause cross talk, interference, or hum in the signal lines, which interferes
with the emergency warning capability of this equipment. Do not install power
lines in the same conduit as signal lines.
" terminal of the 24 Vdc power supply to the terminal TB2-7 (-24 Vdc) of
–
Model 300MB-SD CommCenter Series D1
position.
240 V
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