Basic Navigation 13
Setup Dimmer
Set Firing Mode
The Set Firing Mode menu allows you to set a dimmer or a range of dimmers to a specific firing mode.
Available modes include Normal, Off, Switched, Fluorescent, Reverse Phase, and DD (Dimmer
Doubled).
Dimmer firing modes:
• Off: turns the dimmer off.
• Normal: operates as a standard incandescent dimmer.
• Switched: dimmers output unregulated AC voltage when the control level is above the threshold
level.
• DD (Dimmer Doubled) (60Hz systems only): dimmer operates as two controllable circuits. See
Dimmer Doubling (60Hz systems only)
on
page 5
.
Set Curve
The Set Curve menu allows you to set a dimmer or a range of dimmers to a specific curve. A dimmer
curve is a mathematical function that maps control levels to RMS output voltage. Curves are scaled
from the minimum voltage to the maximum voltage (settings that are not available to the User login).
The CEM+ supports the following curves: Square, Mod Square, Linear, Mod Linear, Sensor 2.0. See
Dimmer Curves
on
page 73
, for more information.
Scale & Preheat [Power]
The Scale & Preheat menu allows you to set Voltage Regulation, Dynamic Preheat, DC Output Prevent
and Inrush Settings for a dimmer or range of dimmers.
• Max Scale Voltage: set a dimmer or a range of dimmers to a maximum output voltage that is the
top (100% control) of the scaled output of that dimmer.
• Min Scale Voltage: set a dimmer or a range of dimmers to a minimum output voltage that is the
bottom (1% control) of the scaled output of that dimmer. The dimmer will switch on to an RMS
output voltage of Min Scale Voltage when the control level reaches the value set for threshold.
• Set Threshold: set a dimmer or a range of dimmers to a specific control level at which it begins
to respond. Below that level, the dimmer will remain off.
• Dynamic Preheat: this setting allows quick blackouts on dimmers that are set to preheat.
• Voltage Regulation: when enabled, the dimmer will regulate to the desired output voltage. When
disabled, the dimmer will be set to a constant firing time based on the control level. This setting
defaults “on”. The ability to disable regulation is sometimes useful when dimming non-tungsten
loads.
• Inrush Protection: this setting protects against large voltage increases in a single AC cycle. This
protection is useful for high-wattage loads that may cause nuisance tripping of circuit breakers
and to limit peak currents in wiring and switch gear. This protection is particularly useful on RCD/
GFCI protected circuits.
• DC Output Prevent: this setting offers protection on selected dimmers for loads that are sensitive
to DC buildup, which can occur under certain conditions when positive and negative half-cycles
become uneven.
• Scale Load: This setting adjusts the choke correction curve based on the specified percent load of
the maximum for that dimmer type. Scale Load can be set from 1% to 100% and should reflect
the approximate percent load on a given dimmer to precisely match all dimmed load. The default
setting is 35% which is based on a single Source Four 750 W fixture on a D20 dimmer with a max
scale voltage of 115 VAC.
Note:
Changing the dimmer firing mode will force the default settings for curve, minimum
voltage, maximum voltage, threshold and regulation. Whenever a dimmer mode
is set the defaults for that mode will be applied to the other dimmer properties.
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