Campbell CC5MPXWD, Instruction Manual

Page: 123 / 126

B-1
Appendix B. Window Defroster Option
Specifications
B.1 Power Supply
The CC5MPX is specified to operate on a 9 to 30 Vdc
supply input range. When the window defroster is
installed, the 30 Vdc maximum must be reduced to 16
Vdc. Operating the CC5MPX with window defroster at
voltages greater than 16 Vdc can cause damage to the
CC5MPX.
Operating voltage:
9 – 16 Vdc
CC5MPX Current Consumption
with Defroster On: 1.2 Amps Max. @ 16 Vdc
1.0 Amps typical on 12 Vdc systems
B.2 Description
The window defroster consists of an aluminum ring with a resistive type
heating element (see FIGURE B-1 ). The CC5MPX can be programmed to turn
on power to the heater based on the internal temperature reading of the camera.
The on duration can also be set on the CC5MPX camera. Refer to Section
8.8.3 , PakBus Variable Control
(p. 82)
, for details on datalogger control of the
window defroster via PakBus®.
The heating element is nominally 18 ohms in resistance. The current draw will
vary with the allowable input voltage range of 9 to 16 Vdc. The current draw
from the CC5MPX and heater combined is 1.2 Amps max at 16 Vdc and is
typically 1.0 Amps on a nominal 12 Vdc system.
The window defroster is useful in preventing and removing light frost and icing
from the camera window. With extreme icing or riming conditions and low
temperatures, the window defroster may not be able to clear the window due to
power constraints of the defroster.
Springs are used to press the window defroster against the window. It is normal
for the window defroster to leave marks on the window. These marks are
outside of the camera’s viewing angle (see FIGURE B-2 ).
WARNING