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Last modified by Alexander Mott on 2024/01/05 18:55
From version 28.1
edited by Alexander Mott
on 2022/09/19 18:45
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To version 15.1
edited by Alexander Mott
on 2022/04/15 20:14
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1 +{{box title="**Contents**"}}
2 +{{toc/}}
3 +{{/box}}
4 +
1 1  (% class="row" %)
2 2  (((
3 3  (% class="col-xs-12 col-sm-8" %)
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9 += Overview =
10 +
5 5  Phase dimming is one of the most common dimming methods for LED fixtures. The term "phase dimming" actually encompasses several dimming technologies which all operate on the same basic principal of chopping up the AC voltage being delivered to the fixtures or drivers.
6 6  
7 7  Phase dimming can be broadly divided into two categories: forward phase dimming and reverse phase dimming. Forward phase dimming operates by cutting off the front (leading edge) of the AC sine wave, while reverse phase dimming cuts off the back (trailing edge) of the AC sine wave. See the [[real world data>>WebHome||anchor="HRealWorldPhaseDimmingData"]] below for an illustration.
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78 78  
79 79  Phase dimming DIN-1DIMU4 modules are installed inside DIN panels, which are typically located inside an electrical room or an MDF/IDF closet.
80 80  
81 -Each DIN-1DIMU4 module has four dimming outputs which all share a common line input. Each output has an LED to indicate current output status (on or off) and a button that can be used to toggle the output. Press this button once to turn the load on or off, and then press and hold this button to raise or lower the output. While dimming, the output percentage is indicated on the LCD screen on the module. Above the toggle button and load indicator LED, each output also has LEDs to indicate current phase dimming mode. Available phase dimming modes are: forced forward, forced reverse, auto-detect, and non-dim (switched). When in auto-detect mode, the "Auto" LED will be lit alongside either the "FWD" or "REV" LED to indicate which type of dimming has been detected. Below the phase mode LEDs is a recessed button which can be pressed to cycle between available phase dimming modes.
87 +Each DIN-1DIMU4 module has four outputs which all share a common line input. Each output has corresponding LEDs to indicate current output status and current phase dimming mode. Each output also has a corresponding button which can be used to toggle each channel independently, and holding the button will cycle dim the phase dimming output for that channel.
82 82  
83 83  See //[[Figure 3>>WebHome||anchor="HFigure3"]]// for details.
84 84  
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86 86  
87 87  Below is a table of actual phase dimming readings at various percentage brightness for some Crestron lighting controllers. Measurements were taken from 120V modules using a true-RMS meter (note that the oscilloscope graph appears high because it is reading the peak voltage).
88 88  
89 -|=(% style="width: 99px;" %)Percentage Brightness|=(% style="width: 764px;" %)CLX-2DIMU8 Oscilloscope Output|=(% style="width: 119px;" %)CLX-2DIMU8 Reading (Reverse Phase)|=(% style="width: 119px;" %)CLX-2DIMU8 Reading (Forward Phase)|=(% style="width: 119px;" %)GL-EXP-DIMU-CN Reading (Reverse Phase)
90 -|(% style="width:99px" %)100%|(% style="width:764px" %)[[image:1649956710772-275.png]]|(% style="width:119px" %)(((
91 -119.7 V AC
92 -)))|(% style="width:119px" %)119.7 V AC|(% style="width:119px" %)120.4 V AC
93 -|(% style="width:99px" %)80%|(% style="width:764px" %)[[image:1649956722651-285.png]]|(% style="width:119px" %)112.7 V AC|(% style="width:119px" %)110.5 V AC|(% style="width:119px" %)113.8 V AC
94 -|(% style="width:99px" %)60%|(% style="width:764px" %)[[image:1649956734539-236.png]]|(% style="width:119px" %)98.5 V AC|(% style="width:119px" %)95.4 V AC|(% style="width:119px" %)99.1 V AC
95 -|(% style="width:99px" %)50%|(% style="width:764px" %)[[image:1649956742753-637.png]]|(% style="width:119px" %)87.2 V AC|(% style="width:119px" %)86.0 V AC|(% style="width:119px" %)90.5 V AC
96 -|(% style="width:99px" %)40%|(% style="width:764px" %)[[image:1649956753212-813.png]]|(% style="width:119px" %)75.2 V AC|(% style="width:119px" %)71.5 V AC|(% style="width:119px" %)78.1 V AC
97 -|(% style="width:99px" %)20%|(% style="width:764px" %)[[image:1649956765039-459.png]]|(% style="width:119px" %)47.5 V AC|(% style="width:119px" %)43.6 V AC|(% style="width:119px" %)52.72 V AC
98 -|(% style="width:99px" %)0%|(% style="width:764px" %)[[image:1649956845393-707.png]]|(% style="width:119px" %)0.003 V AC|(% style="width:119px" %)0.004 V AC|(% style="width:119px" %)1.209 V AC
95 +|=(% style="width: 99px;" %)Percentage Brightness|=(% style="width: 764px;" %)CLX-2DIMU8 Oscilloscope Output|=(% style="width: 119px;" %)CLX-2DIMU8 Reading (V AC)
96 +|(% style="width:99px" %)100%|(% style="width:764px" %)[[image:1649956710772-275.png]]|(% style="width:119px" %)~~118
97 +|(% style="width:99px" %)80%|(% style="width:764px" %)[[image:1649956722651-285.png]]|(% style="width:119px" %)~~112
98 +|(% style="width:99px" %)60%|(% style="width:764px" %)[[image:1649956734539-236.png]]|(% style="width:119px" %)~~97
99 +|(% style="width:99px" %)50%|(% style="width:764px" %)[[image:1649956742753-637.png]]|(% style="width:119px" %)
100 +|(% style="width:99px" %)40%|(% style="width:764px" %)[[image:1649956753212-813.png]]|(% style="width:119px" %)~~74
101 +|(% style="width:99px" %)20%|(% style="width:764px" %)[[image:1649956765039-459.png]]|(% style="width:119px" %)~~47
102 +|(% style="width:99px" %)0%|(% style="width:764px" %)[[image:1649956845393-707.png]]|(% style="width:119px" %)~~0.005
99 99  
100 100  
101 101  )))
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103 103  
104 104  (% class="col-xs-12 col-sm-4" %)
105 105  (((
106 -{{box title="**CONTENTS**"}}
107 -{{toc/}}
108 -{{/box}}
109 -
110 110  (% class="wikigeneratedid" id="HFigure1" %)
111 111  (((
112 -[[[[image:clx-2dimu8.png]]>>attach:clx-2dimu8.png]]
113 -//Figure 1: CLX-2DIMU8 Overview [[(larger)>>https://wiki.chiefintegrations.com/download/SHOWRUNNER%E2%84%A2%20Setup%20Guide/Troubleshooting%20Guide/Wiring%20and%20Hardware/Phase%20Dimming%20Troubleshooting/WebHome/clx-2dimu8.png?rev=1.1]]//
112 +[[[[image:zumlink.png]]>>attach:zumlink.png]]
113 +//Figure 1: CLX-2DIMU8 Overview [[(larger)>>https://wiki.chiefintegrations.com/download/SHOWRUNNER%E2%84%A2%20Setup%20Guide/Troubleshooting%20Guide/Wiring%20and%20Hardware/0-10V%20Dimming%20Troubleshooting/WebHome/zumlink.png?rev=1.1]]//
114 114  )))
115 115  
116 116  (% class="wikigeneratedid" id="HFigure2" %)
117 117  (((
118 -[[[[image:gl-exp-dimu-cn.png]]>>attach:gl-exp-dimu-cn.png]]
119 -//Figure 2: GL-EXP-DIMU-CN Overview [[(larger)>>https://wiki.chiefintegrations.com/download/SHOWRUNNER%E2%84%A2%20Setup%20Guide/Troubleshooting%20Guide/Wiring%20and%20Hardware/Phase%20Dimming%20Troubleshooting/WebHome/gl-exp-dimu-cn.png?rev=1.1]]//
118 +[[[[image:clx.png]]>>attach:clx.png]]
119 +//Figure 2: GL-EXP-DIMU-CN Overview [[(larger)>>https://wiki.chiefintegrations.com/download/SHOWRUNNER%E2%84%A2%20Setup%20Guide/Troubleshooting%20Guide/Wiring%20and%20Hardware/0-10V%20Dimming%20Troubleshooting/WebHome/clx.png?rev=1.1]]//
120 120  )))
121 121  
122 122  (% class="wikigeneratedid" id="HFigure3" %)
123 123  (((
124 -[[[[image:din-1dimu4.png]]>>attach:din-1dimu4.png]]
125 -//Figure 3: DIN-1DIMU4 Overview [[(larger)>>https://wiki.chiefintegrations.com/download/SHOWRUNNER%E2%84%A2%20Setup%20Guide/Troubleshooting%20Guide/Wiring%20and%20Hardware/Phase%20Dimming%20Troubleshooting/WebHome/din-1dimu4.png?rev=1.1]]//
124 +[[[[image:glpac.png]]>>attach:glpac.png]]
125 +//Figure 3: DIN-1DIMU4 Overview [[(larger)>>https://wiki.chiefintegrations.com/download/SHOWRUNNER%E2%84%A2%20Setup%20Guide/Troubleshooting%20Guide/Wiring%20and%20Hardware/0-10V%20Dimming%20Troubleshooting/WebHome/glpac.png?rev=1.2]]//
126 126  )))
127 127  )))
128 128  )))
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