Redundant Tracking Systems; Redundant Tracking Switch; Automatic Control - ETC Sensor3 CEM3 User Manual

Appendix C

Redundant Tracking Systems

CEM3 features the ability to support dual redundant controllers in ESR24, ESR36 and ESR48 rack types,
as well as in the FDX3000 rack.
Redundant controllers provide extra security in the event of system failure, allowing a secondary
processor to immediately take control of the rack.
Redundant
Tracking Switch
Controller A
Controller B

Redundant Tracking Switch

The redundant tracking switch determines which controller runs the output to the dimmers. It has
three positions.
• When the switch is set to A (upper position), the upper controller has control of the dimmers.
• When the switch is set to B (lower position), the lower controller has control of the dimmers.
• When the switch is set to Auto (center position), control is automatically allocated based on the
health of the system (see below for details).

Automatic Control

Typically, in a redundant tracking system, the switch should be left in the auto position. When the
switch is set to auto, the A processor will have control by default. Control will switch to B when any of
the following events occur.
60
Power DMX A DMX A Network Panic
Reset
Power DMX A DMX A Network Panic
Reset
Redundant tracking in a Sensor ESR Rack
Redundant tracking in an FDX3000 Rack
abc def
ghi jkl mno
Test
Enter
About Back pqrs tuv wxyz
Last Next
#nav
Setup Enter
A B
abc def
Test ghi jkl mno
Enter
pqrs tuv wxyz
About Back
Last Next
Setup #nav Enter
A B
Controller A
at
and
thru
at
Controller B
and
thru
Redundant
Tracking Switch
CEM3 User Manual