Service manual

13
Functional Description
DCB, DCFCB and DCFCTB Models
Control Cabinet Functional Descriptions
The DC Control cabinet has the following main parts:
 Motor Contactors
 Battery Chargers
 Power Distribution and fusing at the din rail
 Radio Transceiver (not included with DCB models)
 FCM Communications/Controller Board (not included with DCB models)
Motor Contactors
Two 200 Amp rated motor contactors are used for switching the 48 VDC power to
the siren motor via K2, and the rotator motor via K1. The contactors are controlled by
the relay outputs on the DCB, DCFCB and DCFCTB.
A third optional contactor, K3, is used to switch between the rectified 48 VDC
provided by the 2001TRB option and the 48 VDC provided by the four (4) batteries
in the battery cabinet. The switching occurs automatically when the 2001TRB power
is lost.
The wiring to the siren and rotator motor is protected by a 200 Amp fuse.
Battery Chargers
Four chargers are used to independently charge each of the batteries in the battery
box. The chargers are connected in series, as are the batteries to provide the 48VDC
to the siren and rotator motors. Each charger has a built-in 7.5 Amp fuse, and charger
wires are fused with 10 Amp fuses within the battery cabinets.
Power Distribution and Fusing at the Din Rail
The din rail is used to distribute and fuse various voltages. The following is a
description of the terminals at the din rails:
Terminal
Description
TB1
1
+12 VDC, from Charger 1
2
+24 VDC, from Charger 2
3
+36 VDC, from Charger 3
4
+48 VDC, from Charger 4
TB2
1
Ground
2
Ground
3
Ground