ETC CEM3 v1.5.1 - Manual (Page 64)

58 CEM3 User Manual
Advanced Features in FDX
FDX3000 supports all module types available in the FDX series of racks, including the
DP90 and DP90S series of modules.
Advanced Features in an FDX rack allows modules which provide Voltage or Current
feedback data to be monitored and to report errors both at the local UI and at ETC's console
products and feedback software.
Feedback Modes and Module Types
FDX modules may be set to one of the following module types:
To configure the module type see Dimmer Property Definitions, page 19 .
Roasting Short Protection
FDX3000 features a unique method for providing additional safety in the event of a roasting
short situation. A roasting short can occur when a dimmer is at a low level and driven into
a short circuit load with a long cable.
Because the dimmer is at a low level, the roasting short does not draw enough current to
trip the circuit breaker, however it is still a dangerous condition as currents can flow at a
high enough amperage to cause heat or, in extreme circumstances, fire.
The FDX3000 rack has the capability to detect this condition. When it is detected with a
module set to V/I mode the dimmer is automatically driven to full, allowing the high current
of the short circuit to trip the circuit breaker.
This facility is automatically enabled on any modules set to V/I mode.
Module
Type
Purpose Error Messages
NoV-NoI
Module provides no
monitoring
No AF Error messages will be produced
NoV-I
Module monitors current,
not voltage “No Load” messages will be produced if the
channel is turned
V-Nol
Module monitors voltage,
not current “Breaker Trip” messages will be produced if the
channel is turned on with the breaker turned off.
V-I
Module monitors both
voltage and current
Both “Breaker Trip” and “No Load” messages
may be produced and the roasting short
protecting feature will be enabled.
FDX 3000
Rack
LIVE
NEUTRAL
Short Circuit
Load