66 CEM3 User Manual
Feedback Modes and Module Types
FDX modules may be set to one of the following module types:
To configure the module type see
Menu Structure
on
page 11
.
Roasting Short Protection
FDX3000 features a unique method for providing additional safety in the event of a roasting short. 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, a roasting short 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 a roasting short is detected by 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 utility 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
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