Martin MAC III AirFX User Manual page 18

Important! Regardless of the pan and tilt limits you set, when you power the fixture off, the head will sink under
gravity to the nearest rest position (e.g. with the lens pointing vertically downwards if the fixture is
hanging in a rig, or to one side if the fixture is standing fastened to a horizontal surface). When you
power the fixture on, the head will not move until the fixture receives a pan or tilt command. When a
command is received, if the head's rest position is outside its pan/tilt limits, the head will move
slowly until it is within its limits. This feature reduces the risk of damage caused by a collision.
Pan and tilt limits can quickly be returned to the factory default setting (all limits at 0°, pan/tilt limits disabled)
by setting DEFAULT LIMIT SETTINGS to On and clicking with the jog wheel to confirm.
• SPEED SETTINGS lets you set PAN & TILT SPEED to Normal, Fast (optimized for speed) or Slow
(optimized for smooth movement – useful in long-throw applications). Likewise, you can set EFFECT
SPEED to Normal, Fast or Slow. You can also set effect speed to Follow P/T speed, in which effects will
always use whatever speed is set for pan and tilt.
• The FANS menu gives three cooling fan options:
- LAMP COOLING sets the lamp cooling effect to 50% or 80%. The color temperature of the lamp and
lamp performance towards the end of the lamp life vary slightly with the level of lamp cooling applied.
The default level is 80%, which is recommended for optimum performance over the full life of the lamp.
Setting to 50% gives a slightly lower color temperature and quieter fan operation but accelerates the
gradual reduction in output which is normal over the lifetime of a discharge lamp.
- FAN CLEAN gives three options for automatically clearing dirt from fans:
Off sets fans to normal operation with no fan cleaning function.
Auto sets fans to normal operation, but if a fan error is detected, the fan that has reported an error
speeds up to 100% for a short period and then returns to normal operation. If the fan error is still
detected after three attempts at cleaning, the fan returns to normal operation but continues to report a
fan error. This feature works independently for each of the fans. Attempts at cleaning are reset to zero
if the fixture is reset or if FAN CLEAN MODE is updated.
Forced sets all fans to 100% speed until another FAN CLEAN MODE setting is selected.
This feature does not eliminate the need to inspect and clean cooling fans at regular intervals (see
"Cleaning" on page 37).
- FAN MODE allows you to set fans to Always on or Follow lamp off mode, in which fan operation is
disabled when the lamp is powered off.
• DIMMING CURVE provides four dimming options (see Figure 11):
DMX %
Optically linear
- Optically linear – the increase in light intensity appears to be linear as DMX value is increased.
- VRMS linear (S-curve) – light intensity control is finer at low levels and high levels and coarser at
medium levels. This curve emulates the RMS voltage dimming characteristics of an incandescent lamp
such as the tungsten halogen lamp of the Martin™ MAC TW1™.
- Square law – light intensity control is finer at low levels and coarser at high levels.
- Inverse square law – light intensity control is coarser at low levels and finer at high levels.
• FOCUS TRACKING sets focus to automatically self-adjust when you use the zoom effect (see
"Zoom/focus linking" on page 25).
• FOLLOWSPOT MODE enables pan, tilt, or pan and tilt movement to be unlocked so that the head of the
fixture can be directed by hand using a user-supplied handle (see "Followspot mode" on page 25). In
followspot mode the motors can be applied as a brake to pan, tilt, or both pan and tilt movement to prevent
head movement when the fixture is not "manned"; in this case DMX or menu-based control over pan and
tilt is still disabled.
• AUTOMATIC LAMP ON gives three lamp strike options:
- When set to Off, the lamp remains off until a "lamp on" command is received via DMX.
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DMX %
VRMS linear
Figure 11: Dimming curve options
MAC III AirFX user manual
DMX %
Square law Inverse square law
DMX %