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Last modified by Alexander Mott on 2024/01/05 18:55
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edited by Alexander Mott
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Title
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1 -Phase Dimming Troubleshooting
1 +Phase Dimming Troubleshooting (WIP)
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1 -SHOWRUNNER™ Setup Guide.Troubleshooting Guide.Hardware and Installation.WebHome
1 +SHOWRUNNER™ Setup Guide.Troubleshooting Guide.WebHome
Content
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1 +{{box title="**Contents**"}}
2 +{{toc/}}
3 +{{/box}}
4 +
1 1  (% class="row" %)
2 2  (((
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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 -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>>SHOWRUNNER™ Setup Guide.Troubleshooting Guide.Troubleshooting.Phase Dimming Troubleshooting.WebHome||anchor="HRealWorldPhaseDimmingData"]] below for an illustration.
13 +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.
8 8  
9 9  In the event that phase dimming fixtures are exhibiting unexpected dimming behavior, an easy place to begin troubleshooting is at the lighting control module.
10 10  
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15 15  1. Identify the module and output that should be dimming the fixtures
16 16  1. Disconnect the switch leg to the fixture
17 17  1. Connect a multimeter to the switch leg output of the module
18 -1. Measure the V AC output at various brightness levels
19 -1*. If the system has been partially or fully commissioned, it may be possible to use the ShowRunnerCLC™ UI to adjust the brightness
24 +1. Measure the AC output at various brightness levels
25 +1*. If the system has been partially or fully commissioned, it may be possible to use the showrunner™ UI to adjust the brightness
20 20  1*. Alternatively, some modules have physical buttons that can be used to adjust their brightness:
21 21  1**. Press the button to toggle the output on or off. A small LED light on the module will indicate current output on/off status.
22 22  1**. Once the output is on, press and hold the button to cycle dim the output (first press and hold will lower the output, subsequent press and holds will toggle between raising and lowering the output)
23 -1. The measured V AC should decrease with lower brightness levels, but does not necessarily have a linear relationship to the brightness (e.g., output at 20% brightness will be a lower voltage than at 100% brightness, but will not necessarily be 20% of the voltage).
29 +1. The AC
24 24  1*. Chief Integrations has recorded actual AC outputs for a few different 120V Crestron modules, available at the bottom of this article.
25 25  
32 +Below is a table of how to interpret troubleshooting results:
33 +
34 +|(% style="width:209px" %)**Result**|(% style="width:321px" %)**Interpretation**|(% style="width:453px" %)**Next Steps**
35 +|(% style="width:209px" %) |(% style="width:321px" %) |(% style="width:453px" %)(((
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40 +)))|(% style="width:453px" %)(((
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45 +
26 26  = Verifying Fixture Wiring and Compatibility =
27 27  
28 28  == Troubleshooting Phase Dimming Wiring ==
29 29  
30 -There are a number of wiring and hardware issues that may result in fixtures not behaving as expected. If fixtures are flickering rapidly as they are dimmed, then fixture compatibility with the dimming module should be verified. Check for incorrect wiring in the field by powering off the circuit for the fixtures, disconnecting the wiring from the module to the fixtures, and then powering the circuit back up. If the wires going to the fixtures still have voltage on them, then they are receiving power from some other source besides the module, which will result in dimming and control issues.
50 +There are a number of wiring and hardware issues that may result in fixtures not behaving as expected. Described below are some techniques that can help determine issues with wiring or hardware, however due to the wide variety of available fixtures and drivers it is not comprehensive.
31 31  
52 +|(% style="width:273px" %)**Result**|(% style="width:317px" %)**Interpretation**|(% style="width:393px" %)**Next Steps**
53 +|(% style="width:273px" %) |(% style="width:317px" %) |(% style="width:393px" %)
54 +|(% style="width:273px" %) |(% style="width:317px" %) |(% style="width:393px" %)
55 +
32 32  == Determine Fixture Compatibility ==
33 33  
34 34  (% class="wikigeneratedid" %)
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43 43  (% class="wikigeneratedid" %)
44 44  Verify that the type of phase dimming required (forward or reverse) matches the type of phase dimming being output by the module. Many Crestron modules are universal phase dimming which should auto-detect the required dimming, but sometimes it will detect the incorrect dimming and must be forced to the correct mode. Consult the installation guide for each module to determine how to check and force the dimming mode.
45 45  
46 -(% class="wikigeneratedid" %)
47 -It is also possible that there is a compatibility issue between the LED driver and the fixture. There are two types of LED driver: constant current and constant voltage. Constant current drivers dim the LED fixtures by varying the voltage output to reduce power while keeping current constant. Constant voltage drivers dim the LED fixtures by rapidly pulsing a constant voltage output. If the incorrect type of driver is used to power the fixtures (e.g. a constant current driver used for fixtures which require constant voltage), then the fixtures will not dim correctly. Verify that the drivers used are compatible with the fixtures.
48 -
49 49  = Specific Crestron Modules =
50 50  
51 51  The below sub-sections cover specific dimming procedures for various phase dimming controllers produced by Crestron.
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58 58  
59 59  On the front of 0-10V CLX modules are eight LEDs corresponding to each of the eight outputs. Above these LEDs are two buttons which can be used to toggle each output individually, view the current dimming mode, and switch the dimming mode for each output. There is no way to dim individual outputs from the module; the system must be at least partially commissioned with a functioning processor in order to verify dimming functionality.
60 60  
61 -See //[[Figure 1>>SHOWRUNNER™ Setup Guide.Troubleshooting Guide.Troubleshooting.Phase Dimming Troubleshooting.WebHome||anchor="HFigure1"]]// for details.
82 +See //[[Figure 1>>WebHome||anchor="HFigure1"]]// for details.
62 62  
63 63  == GL-EXP-DIMU-CN ==
64 64  
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72 72  
73 73  The ON/OFF button sits proud of the module cover, so care must be taken when replacing the cover to avoid damaging the button.
74 74  
75 -See //[[Figure 2>>SHOWRUNNER™ Setup Guide.Troubleshooting Guide.Troubleshooting.Phase Dimming Troubleshooting.WebHome||anchor="HFigure2"]]// for details.
96 +See //[[Figure 2>>WebHome||anchor="HFigure2"]]// for details.
76 76  
77 77  == DIN-1DIMU4 ==
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.
102 +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 -See //[[Figure 3>>SHOWRUNNER™ Setup Guide.Troubleshooting Guide.Troubleshooting.Phase Dimming Troubleshooting.WebHome||anchor="HFigure3"]]// for details.
104 +See //[[Figure 3>>WebHome||anchor="HFigure3"]]// for details.
84 84  
85 85  = Real World Phase Dimming Data =
86 86  
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).
108 +Below is a table of actual phase dimming readings at various percentage brightness for some Crestron lighting controllers. Measurements were taken from 120V modules operating in forward phase mode.
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
110 +|=Percentage Brightness|=CLX-2DIMU8 Oscilloscope Output|=(% style="width: 86px;" %)CLX-2DIMU8 Reading|=(% style="width: 83px;" %)DIN-1DIMU4 Reading
111 +|100%|[[image:1649956710772-275.png]]|(% style="width:86px" %) |(% style="width:83px" %)
112 +|80%|[[image:1649956722651-285.png]]|(% style="width:86px" %) |(% style="width:83px" %)
113 +|60%|[[image:1649956734539-236.png]]|(% style="width:86px" %) |(% style="width:83px" %)
114 +|50%|[[image:1649956742753-637.png]]|(% style="width:86px" %) |(% style="width:83px" %)
115 +|40%|[[image:1649956753212-813.png]]|(% style="width:86px" %) |(% style="width:83px" %)
116 +|20%|[[image:1649956765039-459.png]]|(% style="width:86px" %) |(% style="width:83px" %)
117 +|0%|[[image:1649956845393-707.png]]|(% style="width:86px" %) |(% style="width:83px" %)
99 99  
100 100  
101 101  )))
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103 103  
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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]]//
127 +[[[[image:zumlink.png]]>>attach:zumlink.png]]
128 +//Figure 1: ZUMLINK-JBOX-16A-LV 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]]//
133 +[[[[image:clx.png]]>>attach:clx.png]]
134 +//Figure 2: CLX-2DIMFLV8 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]]//
139 +[[[[image:glpac.png]]>>attach:glpac.png]]
140 +//Figure 3: GLPAC-DIMFLV8 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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