ISP Technologies HDL 3112 - Manual (Page 8)

In a flown configuration the cabinet
angles are set by sliding the link
from the top cabinet down into the
slot of the rear hinge on the next
cabinet and inserting the quick
release pin in the proper hole
selection for the desired splay
angle. In a ground stack
configuration, simply select the
desired splay angle and pin the link
into the proper hole. You then
insert the additional quick release
pin into the ground stack hole in
order to obtain the desired splay
angle.
THERMAL CONDITIONS
The ISP HIGH DEFINITION LINE 3112 Series is capable of producing in excess of 800
watts at full power. This generates heat that must be dissipated in order to maintain
reliability and insure the amplifier components stay within their operating temperature
specs. To accomplish this, the amplifier is mounted on a heatsink that is internal to the
cabinet. Airflow is drawn in from the front and is forced through a port on the rear near
the internal heatsink.
In addition, the amplifiers are thermally protected internally via a thermal switch, which
will attenuate the signal 40dB if the heatsink temperature exceeds a safe operating
temperature. When the temperature drops below a critical point, full signal will be
restored. This also protects the system if the internal fan should fail. Tests have shown
under extreme conditions that cycling will occur approx. (40 sec. ON, 20 sec. OFF)
It should also be noted that a separate internal thermal breaker also protects the power
transformer. If the power transformer temperature reaches a critical point, the
transformer internal thermal breaker will open. If this condition occurs, simply reduce
the signal level of the system. This will only occur if the HIGH DEFINITION
LINE 3112 is
continually pushed into excessive heavy distortion.