Service manual

14
Functional Description
DCB, DCFCB and DCFCTB Models
TB3
1
12 VDC from Converter
2
12 VDC from Converter
TB4
1
48 VDC
TB5
F1
10 Amp fuse for 120 VAC Neutral
F2
10 Amp fuse for 120 VAC Line
1
FUSED AC Neutral
2
FUSED AC Neutral
3
Ground
4
FUSED AC Line
5
FUSED AC Line
Radio Transceiver
When a radio option is purchased, the transceiver is factory installed, programmed
and aligned to work with Federal Signal’s DCFCTB. The 12 V transceiver is
powered by the 48 V to 12V DC-to-DC converter. The converter is powered by the
four 12 V batteries that continue to run the controller in case of a power failure.
Consult the radio’s operating manual for further operating details.
Communications/Controller Board
The Communications/Controller board is located on the backplane of the control
cabinet. This board controls all functions of the DCFCB and DCFCTB. The board
consists of seven main sections:
 Transceiver Interface
 Digital Inputs
 Relay Outputs
 Speaker Output
 Land Line and Local Pushbuttons
 Power Inputs and Power Supply
 Encoder and Decoder Sections