ETC CEM3 v1.5.1 - Manual (Page 61)

D
FDX 3000 Dimmer Racks 55
Appendix D
FDX 3000 Dimmer Racks
CEM3 may be used as a control module in ETC's FDX3000 dimming system, providing
networking facilities, dual redundant control modules, and precision 16-bit dimming. This
appendix details information needed to work with CEM3 in an FDX3000 system, as well as
outlining the hardware of your FDX3000 rack.
Hardware
Front Panel
The FDX3000 carrier contains two CEM3 modules in a dual redundant configuration.
PSU Indicators
The PSU indicators show the status of the two internal power supplies which supply the
15VDC required by FDX dimmer modules.
The two indicators should be lit at all times. If either is not lit, this could indicate a failure of
the internal power supply. If you see this condition, contact ETC Technical Services (see
page 3 ).
Redundant Tracking Switch
The redundant tracking switch allows you to test the ability to switch from the upper (A)
processor to the lower (B) processor. If it is set to the (A) or (B) position, the A or B
processor will preferentially have control. In normal operation, the switch should be set to
the center “Auto” position. This will ensure that A has control unless communication is lost
to A, or certain hardware failures occur on A but not B (for example if A does not see DMX
but B does).
PSU
Indicators
Redundant
Tracking
switch