19
Installation and Maintenance Manual
Federal Signal
www.fedsig.com
Connecting Power to the CommCenter System
Connecting Power to the CommCenter System
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.
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
Set switch SW1 on the motherboard to the 240 V position. See Figure 2 on page 13.
For 24 Vdc Operation
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 the 24 Vdc power supply to the terminal TB2-8
(+24 Vdc) and "–" terminal of the 24 Vdc power supply to the terminal TB2-7 (-24 Vdc) of
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. See Figure 10 on page 18.
