Synrad FH FLYER - Page 227

appendix a
SYNRAD FH Series Flyer Operator’s Manual Version 3.4
225
Cooling
Airow
Just as your car’s engine temperature rises when stationary, Flyer’s internal air temperature rises when the
head is exposed to still air. Even modest airow over the heat sink signicantly reduces maximum tempera-
tures inside the head. If in doubt, install a small fan or ductwork to direct cooling air over the heat sink.
Marking speed (Velocity)
In general, fast optical scanner speeds generate more heat than slow marking velocities.
O-vector speed (O Vector Velocity)
O Vector Velocity is the commanded speed for the optical scanners when making o-vector (non mark-
ing) moves. Fast o-vector moves generate more heat, but help minimize cycle times.
Mark object type
Internal temperatures become higher when marking stroke text and other vector-type objects. This occurs
because both optical scanners are usually making signicant moves throughout their range of motion. Ras-
ter objects, such as bitmaps or linear bar codes, generate less heat since one optical scanner moves small
steps compared to the other scanner.
Mark object size
Although not intuitive, marking small objects generates more internal heat than marking large objects.
This happens because the optical scanners execute acceleration/deceleration commands more often.
Mark duty cycle
To calculate the duty cycle of a marking application, divide mark cycle time by the time measured from
the beginning of one ‘start mark’ input to the next ‘start mark’ input. For example, if the cycle time to
mark one part is 0.80 seconds and there are 1.60 seconds between ‘start mark’ signals, then the mark duty
cycle is 50%. The aects of mark duty cycle on heating are fairly linear—a 50% mark duty cycle will gen-
erate twice the heat of a 25% duty cycle.
Head mounting orientation
The standard mounting orientation for a marking system is to place the laser/head assembly in a horizontal
plane with the focusing lens pointed downward. Any other non-standard mounting conguration should
include some means of cooling Flyer’s heat sink.