Christie Projector Mirage M Series User Manual
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Section 3: Operation Mirage M Series User Manual3-23020-100575-02 Rev. 1 (11-2010) Table 3.3 - Regions and Video Standards: Summary NOTE: Generally, use “Auto” for all instances except: a poor quality input signal or a black-and-white video signal. In order to detect and display such signals, select the relevant standard from the list. • INPUT VIDEO BLACK This control compensates for incoming elevated black levels present in certain video signals, and ensures that blacks in the display are neither crushed (i.e., where dark greys appear black) nor excessively elevated (i.e., where blacks appear dark grey). By default, the projector automatically determines the best setting according to the type of incoming video signal: •0 IRE – Used for DVD output with “enhanced black”, SECAM, most PAL standards, and Japanese NTSC. •7.5 IRE – Used for most NTSC video signals. For some types of video, you can override the setting. The control is disabled for other types of video (and all graphics sources). Generally, if black appears crushed when brightness = 50, choose “0 IRE”. If black appears excessively elevated, use “7.5 IRE”. • COLOR This slide bar adjusts the color saturation level. Lower settings produce less saturated colors, for example a setting of “0” produces a black and white image. If the color level is too high, colors will be overpowering and unrealistic. •TINT Adjusts the red/green color hue for true color reproduction of video and HDTV signals. For best results, adjust tint while displaying an external test pattern—it is recommended that tint remain at its default setting. •FILTER The proper filter setting is automatically set for virtually all signals, and rarely needs to be changed. Override only if standard pixel tracking and phase adjustments do not adequately clear up a “noisy” video signal, or if a graphics signal appears overly “soft”. Both instances indicate that “Filter” may be set to the wrong option. •SAMPLING MODE Sets the color sampling mode for a digital signal to either YCbCr 4:4:4, RGB or YCbCr 4:2:2. The proper sampling mode is determined automatically by the projector; you can override this setting. •FILM MODE DETECT Enable or disable film motion detection. Only available for interlaced or segmented frame sources. •CHROMA/LUMA DELAY Affects any incoming composite or S-video signal, delaying the luma signal (intensity) in relation to the chroma (color). In the image, increasing the luma delay will move luma (seen as a shadow where colors overlap) to the right slightly, with colors remaining in place. Decreasing this delay will move the shadow slightly to the left. If necessary for your current source, adjust so that no shadows occur with adjacent colors. STANDARDWHERE USED (Subject to Change) PAL Most of Europe, China, Australia, some of S. America, some of Africa NTSC N. America and Japan SECAM France, Eastern Europe, most of Africa NTSC 4.43 A tape-only standard for partially-translated hybrid signals PAL-M Brazil PAL-NC Argentina, Chile, other Latin American countries PAL 60
3-24Mirage M Series User Manual020-100575-02 Rev. 1 (11-2010) Section 3: Operation • ADAPTIVE CONTRAST Dynamically expands the contrast of the output image producing vibrant images with seamless response to scene changes and fades. The slide bar adjusts the amount of adaptive contrast to apply, with a setting of “0” producing no change. • SPLIT SCREEN This control allows a snap shot of the main image to be presented on the right side or lower part of the screen, to allow evaluation of advanced image processing features. All resizing controls are honoured on both images. However, image processing controls (such as, Detail, Sharpness, Noise Reduction and Adaptive Contrast) only happen on the left side or top image. Changing inputs, channels or test patterns will disable this control. PIP operation must be disabled prior to enabling this control. NOTE: Split screen cannot be used in conjunction with either PIP or Tiling. Both PIP and Tiling must be disabled prior to enabling Split Screen control. • RGB QUANTIZATION RANGE This control defines the RGB quantization levels for digital DVI and HDMI inputs using the RGB colorspace. Typically, graphics sources use the full range of levels for the given bit depth (i.e. 8-bit, 10-bit, 12-bit) and consumer electronics (CE) products typically use a limited range of data within the given bit depth. This control must be set to limited to correct the levels for those CE products that use the limited space. This adjusts what is considered black and white levels in the image. As an example for 8 bit space, full range RGB uses levels 0 (black) to 255(white). Split Screen cannot be used in conjunction with either PIP or Tiling. Both PIP and Tiling must be disabled prior to enabling the Split Screen control. INPUT LEVELS - S UBMENU NOTES: 1) Because the projector automatically optimizes input levels for all but the most unusual of sources, it is recommended that only experienced users use the Input Levels submenu. 2) Before beginning, check that overall contrast and brightness settings are near 50 and that color temperature is properly set up on an internal greyscale test pattern. 3) Refer to 3.1.1 Remote Keypad Commands, “AUTO”. Good RGB or input levels—that is, the drives and black levels for each of the three colors, red, green and blue—ensure that images from analog sources other than decoded video have maximum contrast without crushing black or white. By default (and in an “Auto Setup”), the projector automatically determines the best input levels by monitoring image content and adjusting the controls appropriately—further adjustment is typically not required to obtain proper blacks or whites. NOTE: This automatic adjustment requires at least 6-12 consecutive white pixels in the image. Without these pixels, input levels may produce skewed colors, particularly in non-video images. FIGURE 3-26 INPUT LEVELS
Section 3: Operation Mirage M Series User Manual3-25020-100575-02 Rev. 1 (11-2010) For a source exhibiting overly high black levels (typically caused by a noisy source causing black level spikes) use the Input Levels menu (shown above). These adjustments, serve as a calibration process compensating for differences in sources and cabling, to perfect the source image input levels and eliminate the “overshoot” and “undershoot”. NOTES: 1) Input Levels are of limited use with digital signals, but do offer some ability to tweak poorly mastered source materials. 2) Input levels apply for the current source only, but for any color temperature used. 3) Assuming that color temperature has been set up based on the internal test patterns, you can then set up input levels for a given source so that it matches the color temperature of the internal test patterns. •AUTO INPUT LEVEL Use only if you are an experienced user and you have an unusual source that you feel needs further color temperature and/or input level adjustment. This compensates for incoming out-of-range drives (white) and black levels (black) that would cause “crushing” of light and dark colors in the image. After entering a checkmark, wait for the six slide bar values to stabilize, then delete the checkmark and exit. The Auto Input Level is automatically turned off upon exit from the Input Levels Menu. •BLACK LEVELS AND DRIVES To check your image levels and adjust these controls: 1. Ensure overall “Contrast” and “Brightness” settings are both set to near 50. NOTE: Not required for “Auto” adjustment. C ONTRAST = 50 (approx.) B RIGHT = 50 (approx.) 2. Check the color temperature setup using an internal greyscale test pattern, making sure to obtain a neutral greyscale. NOTE: Not required for “Auto” adjustment. 3. Confirm that you are using input on an Analog BNC card or a Dual Link DVI card. Input Levels are not applicable for sources going through the decoder. A greyscale is recommended. 4. If black levels are too high (and/or whites are too low, which is rare), you likely have a noisy source that is producing skewed input levels. Enable “Auto” in the Input Levels menu. Wait for all six values to stabilize. Alternatively, do not use “Auto”—reduce black levels manually instead. Judge by eye and change one or more of the six levels as necessary to obtain proper blacks and whites. You may want to see only a certain color while adjusting—use the Auto Color Enable option (described below). 5. Delete the “Auto” checkmark and leave the Input Levels menu. IMPORTANT: Do not use Input Levels to adjust color temperature. This will distort contrast and brightness functions as well as color temperature. •AUTO COLOR ENABLE When a checkmark is present, selecting a specific black level or drive to adjust will automatically enable the corresponding color in the display. Delete the checkmark to see all colors, or to enable a different specific color through the Color Enable control. •CLAMP LOCATION Brightens the image produced from certain high-resolution high-frequency graphic sources. The projector automatically selects the best clamp location for most sources. Use the normal Back Porch location if the image is either sufficiently bright or overly bright. Select Sync Tip if the image appears unusually dim, if there are horizontal streaks across the image, or if there is significant color drift. This moves the clamping pulse from the normal back porch location (which is likely too short) to the tip of the horizontal sync pulse. Tri Level is typically needed for an HDTV source.
3-26Mirage M Series User Manual020-100575-02 Rev. 1 (11-2010) Section 3: Operation •INPUT PEAK DETECTOR A tool to assist with defining individual input levels, enabling you to accurately set the Input Levels for any particular source with the appropriate image. Enabling the Peak Detector activates a special operating mode for detecting only pixels that are considered black or white—all other levels are displayed as a mid-level grey. When used with a smooth greyscale pattern in which black and white are known to be at opposite edges of the image, you can watch these isolated areas while adjusting individual black levels and input drives until both black and white edges are just visible and distinguished from neighboring pixels. Images from this source will then display correct blacks and whites without crushing. See Figure 3-27 Adjusting Input Levels Using the Peak Detector (RED EXAMPLE SHOWN). 1. Display a 16 level greyscale test pattern from the desired external source, and enter a checkmark in the Input Peak Detector check box. NOTE: The Input Peak Detector will initially render the greyscale as a uniform grey field before adjustment or extreme crushing. 2. Display one primary color. NOTE: Select Auto Color Enable to ensure the correct color is displayed for each setting. 3. For the current color, adjust its corresponding Black level slide bar just until a single band of black appears at one edge of the screen. This band represents the first band of the greyscale pattern, which should be 100% black. 4. With the same color still active, adjust its corresponding Input Drive slide bar just until a single band of color appears at the opposite edge of the screen. This band represents the last band of the greyscale pattern, which should be 100% white (or the current color, if a certain color is enabled). 5. Check the black band and adjust the black level slide bar if necessary. NOTE: Adjusting the black levels affects the gain. Only adjust when necessary. 6. Repeat Steps 3-5 with the two remaining primary colors. When each primary color shows one optimized black band and white (or colored) band, the input levels for this source are correctly set. Upon exiting the Input Levels menu, the Peak Detector check box will clear. FIGURE 3-27 ADJUSTING INPUT LEVELS USING THE PEAK DETECTOR (RED EXAMPLE SHOWN)
Section 3: Operation Mirage M Series User Manual3-27020-100575-02 Rev. 1 (11-2010) •COLOR ENABLE Select which color or colors you want to see in the display, useful while working with color temperature white levels or input levels. NOTES: 1) Input levels apply for the current source only, but for any color temperature used. 2) If color temperature is set up based on the internal test patterns, you can set up input levels for a given source so that it matches the color temperature of the internal test patterns. ADVANCED IMAGE SETTINGS - S UBMENU Use the Advanced Image Settings submenu to make the adjustments necessary for lesser-used but more specialized applications on your projector. GAMMA SETTINGS - S UBMENU The system offers two types of gamma correction. Gamma correction can be applied to a specific source to correct for luma encoding. This is a channel setting and reapplied every time the same signal is detected. This is the Gamma control. On the other hand the system also provides a global Gamma Correction control. The global control offers an offset applied to all channels. This offset is used to compensate for changes in ambient conditions such as ambient light in the room and projected material. • GAMMA CORRECTION - Applies a global offset to all gamma settings for each channel. It affects the shape of the curve by performing a linear transform toward a gamma curve of 1.0 while the control is increasing and likewise a linear transform toward a gamma of 3.0 as the control is decreasing. The control should only be adjusted to compensate for ambient conditions. To correct a particular source only, use the Gamma control. •GAMMA - Select the base gamma table for a given source. Select from one of the standard tables, a custom gamma function, or select an arbitrary gamma table that has been downloaded to the projector. NOTE: A separate PC utility is needed to do this. The 2.22 curve is a power curve typically used to encode graphics and video sources, see Figure 3-28 Gamma Curve. The standard curve (auto setup default) is a modified 2.22 curve with a small linear section in the black that enhances the detail in darker areas of the projected content. Typically standard or 2.22 is used for all sources. Alternatively, if neither default is ideal, apply a simple gamma curve by defining a custom power function and slope. Select Gamma Function from the drop down list to enable the Gamma Function and Gamma Slope controls. For more complex non-standard gamma curves, a user-defined curve created externally and downloaded to the projector can be used (requires separate PC-based Arbitrary Gamma software application to create the table and the Web UI to download it). NOTE: If any of these special user curves have been installed, their names will appear in the Gamma Table pull-down list. •GAMMA FUNCTION - Defines the base gamma power curve used when the base gamma table value is set to Gamma Function. This value, combined with gamma slope setting determines the base gamma table to be used as the custom base table. The curve is generally a power curve with a small linear segment at the bottom defined by the slope. •GAMMA SLOPE - This control defines a slope to be used for the base custom gamma table for a small section at the bottom of the curve. This slope can be used to bring in or out the low level blacks in the image. This slope combined with the gamma function, define the custom gamma table. FIGURE 3-28 GAMMA CURVE
3-28Mirage M Series User Manual020-100575-02 Rev. 1 (11-2010) Section 3: Operation DETAIL SETTINGS - SUBMENU Adjusts the sharpness of the image. Setting detail above the halfway point can introduce ‘noise’ in the image. Lower settings can improve a noisy signal. • DETAIL - Adjust the sharpness of the image. Setting detail above the halfway-point can introduce noise in the image. Lower settings can improve a noisy signal. This command does not take effect unless the minimum change required in the Detail Threshold control is reached. • TEXTURE ENHANCEMENT - Applies texture detail enhancement based on adaptive horizontal, vertical, and diagonal large edge and small edge enhancement processes. •DETAIL THRESHOLD - Selects a filter sensitivity to noise. A higher value may improve noisy sources especially for higher settings of detail. •DETAIL OVERSHOOT - Minimizes ringing on the enhanced edges detail and texture effects. •SPLIT SCREEN - Allows a snap shot of the main image to be presented on the right side of the screen to allow evaluation of advanced image processing features. All resizing controls are honoured on both images; however, image processing controls only happen on the left side image. Changing inputs, channels or test patterns will disable this control. NOTE: PIP and Tiling operation must be disabled prior to enabling this control. NOISE REDUCTION SETTINGS - S UBMENU •NOISE REDUCTION - Selects a filter sensitivity to noise. A higher value may improve noisy sources, but it will soften the image. • BLOCK ARTIFACT REDUCTION - Locates and reduces block edges produced by discrete cosine transform (DCT) based compression processing. • MOSQUITO NOISE REDUCTION - Reduces mosquito artifacts around sharp edges in DCT based compression by dynamically adapting to image content. • SPLIT SCREEN - Provides a snap shot of the main image to be presented on the right side of your screen to allow evaluation of advanced image processing features. All resizing controls and input card features; such as color/tint etc, are honoured on both images. However; image processing controls such as the detail- texture, noise reduction and adaptive contrast features, only occur to the left side image. Changing inputs, channels or test patterns will disable this control. NOTE: PIP operation must be disabled prior to enabling this control. • FULL SCREEN EYE-MOTION FILTER - Select this control to apply the Eye-Motion Filter to the entire screen, rather than applying just to the edge blending. • EYE-MOTION FILTER - Allows you to adjust this filter to reduce saccadic eye-motion artifacts, sometimes noticeable in edge blending regions. Too much filtering may result in loss of detail. NOTE: For best results, adjust this setting while positioned at the nominal screen viewing distance. COLOR SETTINGS - S UBMENU • SELECT COLOR ADJUSTMENT - Select the output color adjustment most suited to this input signal. The options include the following: Max Drives - All color adjustments are turned off allowing the projector to run at maximum brightness. Color Temperature - Allows you to specify a color temperature between 3200 and 9300 based on the setting of the color temperature slidebar. Expressed in degrees Kelvin [3200K, 5400K, etc.]. Lower numbers appear reddish white and higher numbers appear bluish.
Section 3: Operation Mirage M Series User Manual3-29020-100575-02 Rev. 1 (11-2010) Standard settings are: 9300K, is close to the white of many computer monitors 6500K, is the standard for color video, in both standard and high definition forms 5400K, is a standard for graphics and black and white video 3200K, is useful if the projected image is to be filmed or shot as part of a studio set illuminated with incandescent lights For all color temperatures the color primaries; red, green, and blue are unchanged and reflect the native colors of the projector. SD Video and HD Video - Sets the output color to a specific standard value. Adjusts the colors; red, green, blue, and white. User# - Select 1 of 4 user defined sets of color adjustments; defined in the Configuration menu. IRIS - S UBMENU The Iris adjusts the aperture to allow more or less light through. This will allow for deeper blacks in dark scenes. • ENABLED The Enabled control has options Off, Manual, and Per Channel. Think of this control as a global override. The Iris is either Off (fully open), set to a manual % open position, or it is up to the channel to determine the Iris position. When Enabled is set to Per Channel, the Mode control becomes enabled. This control has the options Off, Manual, or Dynamic. If manual is selected, the Iris Position control becomes a per channel control (instead of a global control). NOTE: Dynamic mode is only available when Enabled is set to Per Channel. • IRIS POSITION Set the fixed manual Iris position as a percentage of fully open. • SENSITIVITY Adjusts how sensitive the Dynamic Iris control algorithm is to small bright objects entering and leaving an image, such as stars or candles. With a lower sensitivity value these small bright objects are more likely to be ignored, producing a more stable light level for the image, with the side effect that some detail in those bright objects will be lost. It is often best to adjust the sensitivity and white compression together to find the optimal settings. • OPEN SPEED The open speed of the Iris represents the maximum Iris change per frame. Increasing this value will allow the Dynamic Iris to travel further in a frame. Decreasing this value will allow for a more gradual change. A slower value will reduce any flicker in the image, but it will also mean that the Dynamic Iris will not react quickly to a scene that suddenly becomes much brighter; resulting in a image that will show a significant loss of detail for several frames. • CLOSE SPEED The close speed of the Iris represents the maximum Iris change per frame. Increasing this value will allow the Dynamic Iris to travel further in a frame. Decreasing this value will allow for a more gradual change. A slower value will reduce any flicker in the image, but it will also mean that the Dynamic Iris will not react quickly to a scene that suddenly becomes much darker, resulting in an image that does not have as much contrast as it could for several frames.
3-30Mirage M Series User Manual020-100575-02 Rev. 1 (11-2010) Section 3: Operation • WHITE COMPRESSION The level of white compression adjusts amount of detail in bright parts of dark scenes. It does not eliminate the detail in affected areas (as the sensitivity control does) but merely reduces it. The amount of detail reduction depends on the average level of brightness in the scene, and the setting of this control. The brighter the scene the less impact this control will have. It is often best to adjust the sensitivity and white compression together to find the optimal settings. • COPY FROM This control allows you to copy the Iris Settings from an existing profile to the current profile. 3.8 Configuration - Adjusting System Parameters and Advanced Controls Use the Configuration menu to define general operating parameters and communications with other projectors and equipment, and to access other advanced processing and image adjustments affecting overall performance. The Configuration menu provides access to diagnostics, calibration tools and the Service submenu (password- protected). The first six options in the Configuration menu are explained below: LANGUAGE Choose the available language to use in the projector’s menus. The change will take effect immediately. OUTPUT OPTIONS CARD - S UBMENU • SCREEN IMAGE ORIENTATION Select the on screen image orientation from Front, Rear, Front Inverted, and Rear Inverted. •FRAME LOCKING Select how the projector controls the output frame timing based on the input signal. When set to Framelock, output image frames are locked to the input if possible. When Locked, the output is always locked to the primary input, never the Secondary image. Free Run sets the output to close to 60Hz for all sources. NOTE: When switching to a new input with framelocking enabled, the image will appear black for a short duration while the system locks onto the new input. •SET FRAME DELAY This control delays the output signal timing relative to the input signal timing by a fraction of a frame, and up to several frames. The minimum latency can vary based on the amount of scaling applied to the image. When using keystone or warping, an additional latency is required, depending on the amount of warp. The control is only available when the input signal is frame locked. In free run mode, or in cases where the signal cannot be frame locked, the minimum latency defined by the scaling and keystone/warp is applied to the signal. FIGURE 3-29 CONFIGURATION MENU
Section 3: Operation Mirage M Series User Manual3-31020-100575-02 Rev. 1 (11-2010) •ACTUAL FRAME DELAY Dynamically calculated by the software as the achievable range being smaller than the set range. The image parameters include, image shift, scaling, warp/keystone applied and format. The menu displays both the user selected value and the actual frame delay value. When setting up tiling of projectors, all projectors in the tile should be set to the worst case, which is the projector with the highest minimum for the setup. •FREE RUN FREQUENCY This control sets the output video vertical frequency. •FADE TO BLACK TIME This control sets the amount of time (in seconds) that it takes to fade the image to/from black. NOTE: The OSD only allows the fade time to be set. To initiate a Fade to Black, the Christie Serial command should be used. •HDMI OUTPUT LOOP SOURCE This control is used to configure the HDMI output options. Selecting Direct Loop will directly pass-through the HDMI input signals: on the same Twin HDMI Input Card, the Input1 signal is looped to Output1 and the Input2 signal is looped to Output2. Selecting Main/PIP Loop will loop the Main & PIP video to the outputs, regardless from which card these signals originate. The Main video signal is looped to Output1 and the PIP video signal is looped to Output2. Selecting Disable will shut off the HDMI outputs completely. NOTE: PIP function is disabled in 3D mode. LENS SETTINGS - S UBMENU •INTELLIGENT LENS SYSTEM Check this box to enable the Intelligent Lens System (ILS). When enabled, the lens position (horizontal, vertical, focus, and zoom offsets) are stored per channel. If you change channels, the lens position will change as the new signal is being displayed.When ILS is not enabled, the lens is controlled independently of channels or input signals. •MANUAL ZOOM/FOCUS When this control is selected, the holding current is removed from the zoom and focus motors so that they can be changed manually. NOTE: Zoom and Focus should not be adjusted manually when this control is not selected, as this will result in damage to the motors. •CALIBRATE The lens calibration procedure is needed each time a new lens is installed in order for the ILS feature to perform reliably. This procedure calibrates; horizontal, vertical, focus, and zoom offset movements. •LOCK ALL LENS MOTORS Select this check box to prevent all lens motors from moving. It will disable the Zoom, Focus, Horizontal and Vertical Position settings, effectively locking out any changes and overriding all other lens features. This feature is particularly useful to prevent accidental lens position changes in multi-projector installations. •CALIBRATE ON NEW LENS Check this box to prompt for a lens calibration each time a lens is inserted. The user will always be prompted before starting the calibration. •CALIBRATE ON STARTUP Check this box to initiate a ‘Lens Reset’ procedure on every power-up. This is useful if the lens is subject to manual movement between power sessions. •HOME POSITION Return the lens to the horizontal and vertical home position. Focus and zoom are unaffected.
3-32Mirage M Series User Manual020-100575-02 Rev. 1 (11-2010) Section 3: Operation •CALIBRATION STATUS Displays the current lens calibration status. POWER MANAGEMENT - S UBMENU •LCD BACKLIGHT The backlight for the LCD has 3 states. Always On, Always Off, or Timer. The backlight will turn on again when any key on the LCD is pressed or if an alarm is raised. •LCD BACKLIGHT TIMER Set how long the LCD backlight stays on (in seconds) when in timer mode. •LCD BACKLIGHT LEVEL Sets the LCD backlight brightness level. Maximum 25/Minimum 0. •AUTO POWER UP If there is an AC power interruption, while Auto Power Up is enabled, the projector will resume operation in the same state as it left off. If the lamps are on and an image showing when AC power is lost, the projector will automatically power back up with the lamps on and an image will show when AC is restored. •AUTO SHUTDOWN ENABLE When Auto Shutdown Mode has been selected, and no projector activity has been seen for the activation time- out period, the projector will enter a power saving mode in which the lamps will dim and the shutter will close. If this condition persists for an additional time-out period, the projector will automatically go to Standby mode. The presence of any activity within this combined interval will cancel Auto Shutdown and return the projector to normal operation. •TURN OFF IMAGE AFTER (min) This sets the activation interval (in minutes) for Auto Shutdown. If all activity (input signals, web or serial port activity, key presses) is lost for this length of time, and Auto Shutdown is enabled, an Auto Shutdown cycle will begin. •ENTER STANDBY AFTER (min) This sets the interval (in minutes) between starting Auto Shutdown and entering Standby mode. Once Auto Shutdown has been entered, and all activity continues to be absent for this interval, the projector will automatically enter power Standby mode. •LAMP REGENERATION START TIME For 24/7 operation, the lamp regeneration cycle is required or lamp life will be reduced. This control allows you to set the time of day (in 24 hour format) when the regeneration cycle will start. In Dual Lamp mode, the cycle will be performed on each lamp separately. The second lamp will wait for the first lamp to come back on before it begins the cycle. In single lamp mode, the projector will go into Standby mode for the regeneration cycle. The regeneration cycle will run for 15 minutes for each lamp. The lamp(s) must run for a minimum of 24 hours or the regeneration cycle will be skipped. •OVER-TEMP FAN ASSIST When enabled, this option will cause all fans to come on at full speed if any enabled thermal sensor has an over-temperature fault. This may help to prevent an emergency shutdown if the extra cooling can bring the temperature within limits before the shutdown occurs. The fan assist will cause increased noise levels due to the simultaneous full speed operation of all the fans. Normal operation will resume when all over-temperature conditions are removed or fan assist is turned off.