Automatic Internal Functions - Coemar CF 1200 Hard Edge Instruction Manual

17. Automatic internal
functions
The CF 1200 Hard Edge has several automatic functions and features which at
first glance may not be noticed. However, they serve to add functionality to the
projector, and to assist in extending the serviceabilty of the unit.
on-board hot-strike timer
This on-board feature ensures that the operator cannot re-ignite the lamp until 6
minutes have passed since the lamp was switched off.
This is designed to avoid damage to the lamp ignition circuit which can occur if an
operator contiunally attempts to strike a hot lamp. It further protects the lamp from
possible damage due to voltage spikes which may occur at this time.
NOTE: The timer is reset only when the projector is switched off.
on-board lamp ignition timer
This feature ensures that an operator cannot repeatedly attempt to strike a lamp for
more than 3 seconds if the lamp does not ignite. It will automatically attempt to
restrike the lamp for 3 seconds in every subsequent minute.
This is designed to protect the ballast and lamp ignitor from prolonged usage in less
than ideal conditions.
NOTE: it is important to replace a lamp that is at the end of its useful life and replace
it. Old lamps are generally progressively more difficult to strike.
thermal protection
Two thermal sensors in the body and base of the CF 1200 Hard Edge protect the
unit against overheating.
The thermal sensors operate by removing voltage to the lamp if the ambient tempe-
rature rises above a preset maximum due to either less than ideal air circulation
around the fixture or in the event of cooling fan failure.
automatic realignment
An internal 4 point encoder system allows the CF 1200 Hard Edge to return to its
correct position in case the unit is accidentally knocked out of alignment whilst ope-
rating. This is particularly useful if the projector is to be mounted on the floor in a
position where the performer or artist may accidentally bump the unit.
NOTE: this facility may be deactivated if desired (see section 11 opto).