Sunburst SB2400 Dimmer Rack and Receiver. Version 1.02 P/N F371

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1 Sunburst SB2400 Dimmer Rack and Receiver 86(50$18$/ Version 1.02 P/N F371 Copyright 2004 Lehigh Electric Products Co. Revised January 2006

2 TECHNICAL INQUIRY The dimming system consists of electrical and electronic components that could cause electrical shock if tampered with. Only individuals experienced with electrical and electronic equipment should remove the panels or attempt to service this system. All questions regarding this equipment should be referred to: Lehigh Electric Products Company 6265 Hamilton Boulevard Allentown, Pa Phone: Fax: Website: WARRANTY SUBJECT TO THE TERMS OF THIS PARAGRAPH, THE SUPPLIER WARRANTS ITS TITLE TO THE PRODUCTS SOLD BY IT AND WARRANTS TO THE PURCHASER THAT ITS PRODUCTS ARE FREE OF DEFECTS IN WORKMANSHIP OR MATERIAL AND ARE IN CONFORMITY WITH APPLICABLE SPECIFICATIONS AND DESCRIPTIONS OF THE SUPPLIER. NO CLAIM SHALL BE MAINTAINED HEREUNDER UNLESS THE FACTS GIVING RISE TO IT ARE DISCOVERED WITHIN 16 MONTHS FROM THE DATE OF SHIPMENT FROM THE FACTORY, OR 12 MONTHS AFTER INITIAL ENERGIZATION OF SAID EQUIPMENT, WITH THE ONE EXPIRING FIRST GIVEN PRECEDENCE, AND WRITTEN NOTICE THEREOF GIVEN TO THE SUPPLIER WITHIN 30 DAYS OF DISCOVERY. THE SOLE AND EXCLUSIVE LIABILITY OF THE SUPPLIER, FOR BREACH OF WARRANTY SHALL BE, AT ITS OPTION, TO REPLACE OR REPAIR THE PRODUCT OR PART CONCERNED F.O.B. ITS FACTORY OR SUCH PLACE AS IT MAY DESIGNATE. THE WARRANTIES STATED IN THIS PARAGRAPH ARE EXCLUSIVE OF ALL OTHER WARRANTIES, WRITTEN OR ORAL, STATUTORY, EXPRESSED OR IMPLIED, NONE OF WHICH SHALL APPLY TO THE SALE OF THE SUPPLIERS PRODUCTS HEREUNDER

3 7$%/(2)&217(176 RACK OVERVIEW...1 INSTALLATION...1 Mounting...1 Wiring...1 Input Power...1 Load & Neutral Wire Dimmed Fluorescent (optional)...2 Low Voltage Fluorescent (optional)...2 Control Wiring...2 COOLING...2 DIMMERS...3 Dimmer Performance...3 Firing Cards...3 Phase Loss Sensor (optional)...3 Over-current Protection...3 CONTROL POWER...3 RECEIVER OVERVIEW...4 PROGRAMMING AREA...5 SETTING THE INPUT TYPE...6 PROGRAMMING...6 Modes...6 Patching and Precedence Rules...6 Load Type...7 Maximum Output Level...7 Test/Control Mode...7 DMX-Fail...8 Clear Memory...8 Ramp Test...8 Focus Check...9 LINK STATUS...9 OVERTEMP...9 BYPASS...9 MAINTENANCE...10 TROUBLESHOOTING...10 No Lights Are ON...10 Lights Will Not Go OFF...10 i

4 ADDENDUM ANALOG (SINGLE-SET) CONTROLS...13 Overview...13 Operation...13 Patching...14 Bypass...14 Overtemp...14 ii

5 5DFN2YHUYLHZ The Sunburst 2400 (SB2400) features 6, 9 or 12 universal dimmers rated at 2400 watts. The SB2400 is easy to install with main lugs that easily accept top or bottom feed and an expanded wiring trough area for contractor load and control wiring. The SB2400 is a modular, welded steel cabinet with a textured black powder coat finish and a removable front panel. The SB2400, with dimensions of 17 wide x 39 high x 4 deep, is a wall mounted design for surface or recessed (with an optional oversized cover) mounting. A diagram of the rack is shown on page 11.,QVWDOODWLRQ Mounting Keyhole mounting holes have been provided in the back of the rack for wall mounting. The holes are sized to accept ¼ lag bolts. See page 11 for mounting hole dimensions. Wiring Input Power The main phase lugs (contractor power feed connection) are located on the left-hand side of the rack (Figure 1), and are accessible by removing the front panel. The main phase lugs are sized for a #2awg copper wire max. An optional #2awg copper wire max. sub-feed to a second rack is available. It is recommended that the main power conduit be brought through the top of the rack; however, the bottom left-hand side may be used if necessary. Figure 1 1

6 System power feed requirements vary from project to project, please consult the as-built drawings for your specific input power feed requirements. The SB2400 is configured to handle the following system power feeds: a) 120/208V, 3 phase, 4-wire b) 277/480V, 3 phase, 4-wire c) 120/240V, 1 phase, 3-wire (will create an imbalance in the phases). Load & Neutral The output (load) of each dimmer is wired to a DIN connector, which is located in the area next to the dimmer circuit breakers. This is where the contractor will connect the appropriate load wire to the dimmer (Figure 1). The DIN connectors will be labeled 1, 2, # (# = max. # of dimmers). Each DIN connector is capable of accepting #8awg copper wire max. Note: Do not change the factory wiring from the circuit breaker to the dimmers. Each group of dimmers on a dimmer control card uses a different phase leg and changing any of the dimmer input wiring to a different phase will damage the dimmer control cards and void the warranty. Each circuit should have a separate neutral wire run from the rack s neutral bus (located on the left-hand side of the rack) to the neutral of the load. The main neutral lug is sized for a #2/0awg copper wire max. and the load neutral lugs are sized for #4-#14awg copper wire max. 3-Wire Dimmed Fluorescent (optional) Dimmed fluorescent circuits require three wires (load (variable), constant and neutral) per circuit, instead of the normal two. The extra constant wire is used to maintain a voltage on the dimming ballast. The contractor will connect the constant to a separate DIN connector, which will be labeled C1, C2, C# (# = max. # of constants). If the variable and constant wires are switched at the ballast, the fluorescent fixtures will not operate properly. Consult factory for ballast compatibility. Low Voltage Fluorescent (optional) Low voltage (0-10 VDC) fluorescent ballast requires four wires: load (12awg) and neutral (12awg) ballast (18awg) and common (18awg). The contractor will connect the ballast and common signals to separate DIN connectors. The low voltage DIN connectors will be smaller and a different color than the normal load (variable) connectors. Control Wiring All control wiring should be terminated at the pc board located in the bottom right hand corner of the rack. Consult the as-built drawings for the specific board type and wiring details for your project. Note: Before energizing the system, check that all wires are securely fastened to their terminals since some may have worked loose during shipment. &RROLQJ Two 105cfm thermostatically controlled fans and air intake louvers are supplied on the front of the rack. DO NOT BLOCK INTAKE LOUVERS OR FAN EXHAUST AREA, as this will cause excessive heat build-up in the rack which may damage the dimmers or controls. Since the fans are thermostatically controlled, they may turn off during periods when the dimmers are not in use or are running at low output levels. The maximum room ambient temperature should not exceed 40 C (104 F). 2

7 'LPPHUV The SB2400 features 6, 9 or 12 universal dimmers rated at 2400 (2.4K) watts. The universal dimmer will control the following: Incandescent Quartz Low voltage Neon/cold cathode Fluorescent (2-wire forward phase control dimmable ballast only) Non-dim (On/Off lighting load) Optional dimmers can be provided to control the following: Low voltage (0-10 VDC) fluorescent Dimmable fluorescent (3-wire) Dimmer Performance The SB2400 dimmers offer the following performance: Temperature range: 0 to 40 C ambient Line voltage range from 90 to 140 volts Square law-dimming curve Voltage regulation to within 3.5 volts of the input voltage Dimmer efficiency exceeding 95% Symmetrical alternating current output, eliminating any DC component to the load Toroidal chokes limit the current rise time to a minimum of 350 micro-seconds as measured from 10% to 90% of the output waveform at maximum level. Firing Cards The SB2400 dimmers are controlled by firing cards, which contain the circuitry to regulate the output of the dimmer based on the input setting (from console or control station). Each dimmer s firing card controls up to four (4) dimmers which operate on the same input power phase (A, B, or C phase). See page 12 for a firing card diagram. Note: Do not attempt to change the input wiring to any of the dimmers or use the control wires from one firing card to operate a dimmer controlled by another card. Due to the different power phases feeding each firing card, controlling a dimmer from a card on a different power phase will damage the card or other circuitry. Phase Loss Sensor (optional) Phase loss circuitry on the firing card monitors the input power feed and sends a signal to the emergency power source upon the loss of any phase. Over-current Protection Each dimmer has an associated 20A, 1 pole fully magnetic, switch duty rated circuit breaker which serves as a power disconnect and over-current protection. The breaker is UL listed under UL489 as a branch circuit protector with a minimum 10,000 AIC rating. The individual dimmer circuit breakers are mounted on the front left of the rack. A dimmer will not operate unless its circuit breaker is ON. Each breaker identifies the dimmer that it controls (1,2,3 etc). &RQWURO3RZHU There is a control power fuse located at the bottom of the rack (accessible through front panel) which provides 120V to the control system power supply and fans. If the fuse is blown the dimmers will not work. A small flat blade screwdriver is needed to replace the fuse. Replace the fuse only with a UL Listed, 5x20mm, 2 AMP, 250V fuse. 3

8 5HFHLYHU2YHUYLHZ The Sunburst 12-channel receiver provides the following features: Control input choices: a single Collage, a single DMX-512, DMX-512 and Collage, dual Collage. Dimmer to input channel patching with control precedence setting when two inputs are active. Dimmer load settings for incandescent, fluorescent, and non-dim lighting. Maximum output level setting for each dimmer. Diagnostic testing - focus check and ramp testing. Bypass mode to bring all dimmers to full output activated by a switch or an input from a fire alarm or other emergency input. Consult the as-built drawings for the model that is installed in your rack. Receiver Layout Link A LED Link B LED Overtemp LED 4 Fire Alarm Bypass Input Bypass Switch A DMX Link A Input Collage Link B Input Collage Link A Input Programming Area 4

9 3URJUDPPLQJ$UHD The programming area of the receiver consists of push-buttons, LEDs and a 3-character display. All programming and control of the receiver is done using this interface. Link A LED Link B LED Overtemp LED Rotary Switch A Display Dimmer LEDs LEFT/RIGHT Buttons Mode LEDs UP/DOWN Buttons STORE Button MODE Button Programming Controls and Indicators: Rotary switch sets the input type of the receiver (consult as-built drawings). MODE button selects a programming mode. Mode LEDs shows which programming mode is selected. UP/DOWN buttons selects a dimmer. Dimmer LEDs shows which dimmer is selected. LEFT/RIGHT buttons cycles choices through the display. The programmed choice is displayed with a decimal point after the right-most character. When held down for more than 1 second, display choices cycle rapidly. STORE button saves a programming change, selects a choice in the display, or ends a test. Status Indicators: Link A LED ON when data is being received from link A. Link B LED ON when data is being received from link B. Overtemp LED ON when the temperature in the rack exceeds 77 C. 5

10 6HWWLQJWKH,QSXW7\SH The receiver may have one or two inputs on links labeled A and B. The position of the rotary switch indicates the input type of the receiver. To set the switch position, use a small screwdriver to position the arrow to point to a number on the switch. If the switch position is changed, the receiver must be powered up. Switch positions 4 through F are not used. The receiver will not operate correctly if the switch position is wrong. A Switch Position Input Type On Link 0 Single DMX A 1 Single Collage A 2 DMX/Collage A-DMX, B-Collage 3 Dual Collage A-Collage, B-Collage Note: Each of the above (4) board types requires a unique PCB assembly. You cannot simply rotate the switch and expect to change the board type. 3URJUDPPLQJ Modes All programming of the receiver is based on the mode selection. There are up to 6 modes depending on the input type. The mode LEDs indicate which mode is in effect. When none of the mode LEDs are on, programming mode is turned off and only the MODE button is active. If no buttons are pressed and no test is running, programming mode is automatically turned off after 2 minutes. Programming modes PATCH A, PATCH B, SET RULE, LOAD TYPE, and MAX LEVEL are per dimmer. While in one of these modes, the display is showing a setting for the dimmer whose corresponding LED is on. The programmed setting for the dimmer is shown with a decimal point after the right-most character. Other setting choices are shown without a decimal point. The STORE button sets the dimmer to the choice shown in the display. Patching and Precedence Rules Individual dimmers are patched to inputs on Links A and B. All patching is done from the dimmer to the input channels -- a dimmer is selected and then an input channel is patched to the dimmer. An input channel may be patched to more than one dimmer. For example, input channel 1 may be patched to dimmers 1, 2, and 3. Mode PATCH A is used when there is only one input. Mode PATCH B is used for a second input. When there are two links, precedence rules determine which link has control of the dimmer. Each dimmer has a rule setting that applies to the channels patched to the dimmer. Rules A only and B only mean that the dimmer will be controlled by the channel on that input link. Rule highest takes precedence means that the dimmer will be controlled by the channel with the highest value. Rule B if not A means that the dimmer will be controlled by the channel on link B if link A is not active. Otherwise, link A will control the dimmer. For example, on a dmx/collage receiver, rule B if not A gives control to DMX only when DMX is present. How to Patch a Dimmer: Press the MODE button until the PATCH A or PATCH B LED is on. The display will show the input channel patched to the selected dimmer. Press the UP/DOWN buttons to select another dimmer. Press the LEFT/RIGHT buttons to select an input channel to patch to: 0 = no patch 1-36 = for Collage inputs = for DMX inputs 6

11 Press the STORE button to save the change. How to Set a Precedence Rule Press the MODE button until the SET RULE LED is on. The display will show the precedence rule for the selected dimmer. Press the UP/DOWN buttons to select another dimmer. Press the LEFT/RIGHT buttons to select a precedence rule: A = A only b = B only HP = highest takes precedence b-a = B if not A Press the STORE button to save the change. Load Type A load type is set for each dimmer according to the lighting. A load type of incandescent is used for standard (incandescent, quartz, low-voltage, and neon/cold cathode) lighting. Fluorescent is used for all fluorescent lighting with phase control dimmable ballasts. Non-dim is used for non-dimmed (switched) loads. A non-dim dimmer will be at full output when the input value is 50% or greater and off when the input value is less than 50%. How to Set a Load Type: Press the MODE button until the LOAD TYPE LED is on. The display will show the load type for the selected dimmer. Press the UP/DOWN buttons to select another dimmer. Press the LEFT/RIGHT buttons to select a load type: FL = fluorescent nd = non-dim in = incandescent Press the STORE button to save the change. Maximum Output Level Each dimmer has a maximum output level defined as a percentage. A setting of 100% allows for full output. The dimmer output will not exceed the maximum setting regardless of the input. For example, if a dimmer s maximum level is set for 90%, an input value of full will cause the dimmer to output at 90%, not full. Maximum level settings do not apply to dimmers of load type non dim. Those dimmers will always have a maximum output level of 100% which cannot be changed. How to Set a Maximum Output Level: Press the MODE button until the MAX LEVEL LED is on. The display will show the maximum output level for the selected dimmer. Press the UP/DOWN buttons to select another dimmer. Press the LEFT/RIGHT buttons to select a maximum level: = percent of full output Press the STORE button to save the change. Test/Control Mode TEST/CONTROL mode is for system-wide control and testing. With the exception of Focus Check, the dimmer LEDs and UP/DOWN buttons are not used. The STORE button has additional meanings. It is used to select a choice in the display and to end a test. Each TEST/CONTROL option has its own choices, displayed after the option is selected. TEST/CONTROL Option df = DMX-Fail clr = Clear Memory Option choices FUL = full, OFF = off do = clear memory, no = don t 7

12 r = Ramp Test FC = Focus Check do = begin ramp test, no = don t do = begin focus check test, no = don t DMX-Fail This setting determines the dimmer output when the DMX link is not active. It may be set to either full or off. The currently programmed choice will be displayed with a decimal point after the right-most character. This option is only present if an input type is DMX. How to Set DMX-Fail: Press the MODE button until the TEST/CONTROL LED is on. The display will show a TEST/CONTROL option. Press the LEFT/RIGHT buttons until df is displayed. Press the STORE button. The display will show a choice for the option. Press the LEFT/RIGHT buttons until the desired choice (FUL or OFF) is displayed. Press the STORE button to save the change. Clear Memory Clearing memory will set all programmed values to the defaults as shown below. Be careful using this option as you will loose any preset information. Setting Defaults - After Clearing Memory Patch A Dimmer 1 = 1,, Dimmer 12 = 12 Patch B Dimmer 1 = 1,, Dimmer 12 = 12 Precedence Rules for dual Collage All Dimmers = highest takes precedence Precedence Rules for DMX/Collage All Dimmers = B if not A Load Type All Dimmers = incandescent Maximum Level All Dimmers = 100% DMX-Fail Off How to Clear Memory: Press the MODE button until the TEST/CONTROL LED is on. The display will show a TEST/CONTROL option. Press the LEFT/RIGHT buttons until clr is displayed. Press the STORE button. The display will show no. (Press STORE now to exit without clearing memory.) Press the LEFT/RIGHT buttons until do is displayed. Press the STORE button to clear memory. Ramp Test During ramp testing all dimmers are faded up to full at a constant rate. The display shows r to indicate that the ramp test is running continuously. The UP/DOWN and LEFT/RIGHT buttons are inactive during ramp test. Maximum level settings are ignored. When ramp testing ends, the input links resume control of the dimmers. How to Begin a Ramp Test: Press the MODE button until the TEST/CONTROL LED is on. The display will show a TEST/CONTROL option. Press the LEFT/RIGHT buttons until r is displayed. Press the STORE button. The display will show no. (Press STORE now to exit without beginning a ramp test.) Press the LEFT/RIGHT buttons until the do choice is displayed. Press the STORE button to begin the ramp test. How to End a Ramp Test: Press the STORE button. Or, press the MODE button to change programming modes. 8

13 Focus Check During focus check, dimmers can be selected, one at a time, and the output values can be raised or lowered in 1% increments. When the focus check is begun, the display shows F. 0 to indicate that focus check is running and the dimmer output percentage is 0. Press the LEFT/RIGHT buttons to increase or decrease the output percentage at the selected dimmer. Use the UP/DOWN keys to select another dimmer and send the displayed output percentage to that dimmer. Maximum level settings are ignored. When focus check ends, the input links resume control of the dimmers. How to Begin a Focus Check: Press the MODE button until the TEST/CONTROL LED is on. The display will show a TEST/CONTROL option. Press the LEFT/RIGHT buttons until FC is displayed. Press the STORE button. The display will show no. (Press STORE to exit without beginning a focus check.) Press the LEFT/RIGHT buttons until the do choice is displayed. Press the STORE button to begin the focus check. This display will show F. 0 meaning nothing is being output. Press the LEFT/RIGHT buttons to increase/decrease the output percentage. Press the UP/DOWN buttons to select another dimmer. How to End a Focus Check: Press the STORE button. Or, press the MODE button to change programming modes. /LQN6WDWXV LEDs labeled Link A and Link B indicate the status of the links. When the LED is on, the receiver is getting valid data from that link. The LED is not affected by an overtemp condition, bypass activation, ramp test, or focus check. It will always reflect the state of the link, whether or not that link has control of the dimmers. When a link is not active, the LED is off and the dimmer output is either full or off. For a Collage link, all dimmers are set to full. For a DMX link, the dimmers are set according to the programmed DMX-Fail setting. Full output is limited by the maximum level setting of a dimmer. If there are two links and only one is active, the active one will have control of the dimmers. 2YHUWHPS The overtemp LED is normally off. An overtemp condition occurs when the temperature in the rack exceeds 77 C. When this happens, the overtemp LED is turned on and all dimmers are set to 25% of full. All dimmers of load type non-dim will be turned off. The overtemp condition overrides all other dimmer control. When the overtemp condition has been corrected and the thermal cutout has been replaced, the receiver will return to normal operation. Maximum level settings do not apply when overtemp is active. %\SDVV The bypass function allows for all dimmers to be set at full output for testing/installation and in the event of a fire alarm or other emergency. When bypass is activated, all other dimmer controls (except overtemp) are bypassed to force full output at the dimmers. When bypass is turned off, inputs from links A and B resume control of the dimmers. There are two controls for bypass. The Bypass Switch is activated by putting the switch in the ON position. The Fire Alarm Bypass Input may be connected to an external device such as a fire alarm. Maximum level settings do not apply when bypass is active. 9

14 &DXWLRQ THE SB2400 CONTAINS HIGH VOLTAGE POWER WHICH MAY GIVE HAZARDOUS OR FATAL SHOCK. DO NOT ATTEMPT TO OPEN THE RACK WITHOUT FIRST TURNING OFF THE MAIN POWER FEEDING THE RACK. SERVICE SHOULD ONLY BE DONE BY AN EXPERIENCED ELECTRICIAN OR TECHNICIAN. 0DLQWHQDQFH The SB2400 Lighting System uses solid state components, which require minimal to no maintenance. To maintain the system in good working condition the following guidelines are recommended: The SB2400 should be located in a clean, dry area. During operation, the temperature of the room containing the SB2400 should not exceed 40 C (104 F). Allow proper ventilation around the SB2400. To avoid excessive heat build-up in the rack, do not block louvers or fan discharge area. Annual external and internal inspections of the SB2400 should be made by a qualified electrician or technician. The external inspection should check for loose, damaged, or missing panels, which should be corrected immediately. The internal inspection should check all electrical connections (at terminal strips, circuit breaker lugs and dimmer connections) for loose wires or connections. Tighten all connections. Also check for excessive buildup of dust or construction debris, and vacuum out as necessary. The power to the SB2400 should be turned off before making the internal inspections. 7URXEOHVKRRWLQJ No Lights Are ON Check that the main breaker is on. Check that the dimmer circuit breakers are on. The control power fuse may be blown, check the fuse, and replace with a UL Listed, 5x20mm, 2 AMP, 250 V fuse. Check that a control signal is being sent to the SB2400 (ie, that a level is specified on the console or control station). If the SB2400 was in overtemp then the thermal cutout in the rack needs to be replaced (contact factory for replacement). The receiver may not be patched correctly (see page 6 for patching instructions). If it appears that only the lights on a certain phase are out, then one of the firing cards fuses might be blown. With the main power feed breaker off; replace the fuse with a UL Listed, 5x20mm, 2 AMP, 250 V fuse. Lights Will Not Go OFF The dimmers triac may be blown and needs to be replaced (contact factory for a replacement). The bypass switch located on the receiver may be in the BYPASS position, move the switch to OFF. A input from a fire alarm or other such device might be active, putting the lights into bypass mode. A dimmer might be set as a non-dim, and the control signal is greater than 50% causing the light to stay on full. If there is a faint glow on the lights when the control signal is off; adjust the trim pot located on the firing card (see page 12 for location). Rotate the trim pot just until the glow disappears. Working on the rack while it is still energized should only be done by a trained electrician or technician. If you have a 3-wire fluorescent that stays on full, check the appropriate firing card and make sure that the jumper between pins 1 and pins 2 on J1-J4 is cut. Make sure that you know the correct dimmer location of the 3-wire fluorescent and cut only that jumper. De-energize power to the rack before removing the front cover. 10

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17 $GGHQGXP $QDORJ6LQJOH6HW&RQWUROV Overview The single-set slide control system provides direct manual control of the dimmers. Each station consists of at least an ON button, an OFF button (there is also an optional PANIC button available), and a slide pot for each lighting zone. Stations with more than two (2) lighting zones include a Group Master (M), which has proportional control over the slide pots on the station. Operation To operate the station, press the ON button (LED will be lit) and set the Group Master (if supplied) at 10. By raising or lowering the slide pots, the light levels for each lighting zone can be set. If the Group Master is set at 0 there will be no light output, and if it is set to 10 there will be maximum light output. Setting the Group Master at a level between 0-10 will proportionately scale the output of the slide pot. Pressing the OFF button turns the station off and the lights go out. If multiple single-set stations are present in a system the ON button acts as a take-control. Pressing the ON button at a station that does not have control will transfer control to that station and turns off the other station. Any station may be used to turn off the lights without first taking control. 13

18 3DQLF2SWLRQDO The PANIC button will bring selected dimmers up to full output regardless of the slide pot settings. These dimmers will remain at the panic level until released. The panic control may be released by either pressing the ON button, which returns control to the slide pots or by pressing the OFF button which turns the lights off. The dimmers to be panicked are selected on the 12-Channel Overtemp Board, which is located in the bottom right hand portion of the rack. To exclude a dimmer from panic, clip its associated panic diode (D13-D24) from the circuit board. A dimmer that has its diode cut will go to off when panic is activated. D13 corresponds to Dimmer 1, and D24 to Dimmer 12. De-energize the rack before removing any panic diodes. Patching A hard-wire patch is done, by moving and/or jumping the P-signals on the 12-Channel Overtemp Board. For example, if it is desired to control dimmers 1, 7 and 9 with slide pot 1, then connect P-signal 1 to input 1 and jumper input 1 to 7 and 9. Do not put more than one P-signal onto any input. Bypass The dimmer bypass function (turning all the lights to full) is done by placing a jumper wire from the V+ terminal to the PANIC terminal on the Overtemp board. Overtemp When the rack senses an overtemp condition the lights will go to 25% output level and the overtemp LED will be turned on. The lights will stay in overtemp until the thermal cutout in the rack is replaced (consult factory for replacement). 14