AESYS KC640, Maintenance Manual

Page: 15 / 84

ASMM2010 Page 15
Version 1.0 • April 2011
Chapter 2
—
System Overview
Introduction to the Standard Sign System
The full color Light Emitting Diode (LED) Standard Sign System is a high performance product with
optimized visibility characteristics. It is designed to display destination, public relations information, and
general messages that can be controlled manually by the KC640 on-board Central Control Unit (CCU).
Each bus is equipped with a CCU and a number of signs. In typical applications, these signs include a
front sign, dash sign, route side sign, and a side sign that are controlled by manually entering code
numbers on the CCU. The system is built using solid-state components to ensure long life and low
maintenance. Figure 2 shows the Standard Sign System General System Diagram. The system is usually
composed of the following components in each installation (per bus):
 KC640 Central Control Unit with microprocessor (This is the central element that manages all
system components.)
 Display panels (signs) mentioned above
 Data/Power circuit wiring harness, and
 Power supply wiring harnesses.
Depending upon the unique design configuration of a bus, the Standard Sign System can have a different
number of signs. Therefore, Figure 2 is representative of a general system only. All components in the
system operate on 12 V DC
OR 24 V DC. Any power fluctuations within 10 percent will not normally have
an effect on the system. However, wider fluctuations must NOT continue for extended time periods,
because this may result in blowing an internal fuse or possibly component failure.
Figure 2
— Standard Sign System General System Diagram
ASMM2010-003.CDR
CCU to display panel data circuit wiring harness
Power supply wiring harnesses
Emergency/Panic
Alarm Switch