LR-24 Electrofisher - Field Environmental Instruments

LR-24
BACKPACK ELECTROFISHER
Safety Features Descriptions (Cont.)
The LR-24 and Temperature
Fig. 5.5
If the LR-24 is working hard on hot days, it
may overheat and shut down.
If the air temperature in the box reaches 160F
or if the heat sink reaches 200F, an overtemperature
error message will be displayed
and the output will be disabled until the LR-24
cools down.
When using any of the pulsed outputs, the
LR-24 can reduce the frequency of the output
pulses automatically based on its internal
temperature. This has the effect of reducing
the power level of the LR-24 and therefore the
heat being produced inside the system.
This can allow the LR-24 to continue to work
instead of waiting for it to cool down again.
This power reduction does not begin until the
LR-24 is near the point of thermal overload,
so under most conditions it does not affect the
output at all. If unpulsed DC is being used
the LR-24 can reduce the output voltage if
it is near thermal overload. Again ,this can
allow the LR-24 to continue working instead
of waiting for it to cool down. In both modes
of operation as the LR-24 cools down, the
output is increased back toward the original
settings.
When enabled and the temperature of the LR-
24 reaches the trip point, both of the audio
alarms will begin to beep simultaneously and
the Thermal Limit display will show the
set frequency, or voltage, in the case of DC
Continued on next page...
Battery Compartment Interlock Switches
The cover of the battery compartment contains an interlock
mechanism (A) that automatically turns off power to the
LR-24 if the cover is opened. When replacing the battery
compartment cover, adjust it so that it is on the inside of the
molded guides (B) of the pack frame. The cover must be
correctly placed before the LR-24 will operate.
RIGHT: Detail
showing relative
A
locationsof Interlock
Switch inside control
box (not visible) and
A
magnet inside of lid.
B
LEFT:Detail showing
molded guides on pack
frame. Lid must be aligned
correctly and latched for
unit to operate.
Fusible Links
The battery pack of the LR-24 incorporates a fusible link
to protect the batteries from excessively high currents. In
the event this fusible link blows out, it must be replaced
with the same size and type as the original link in order to
continue to provide protection for the battery pack and its
wiring.
WARNING: Replacement of this link by anyone other
than Smith-Root, Inc. will void the warranty of the entire
electrofishing system.
Temperature Sensors
There are internal temperature sensors which can shut the LR-
24 down if excessive temperatures are detected; If the LR-24
is shut down due to high temperature, an error message is
displayed for as long as the temperature is above safe limits.
After the LR-24 has cooled, the error message is cleared and
full operation is automatically restored.
The Thermal Foldback Mode (System Menu 4) can
help decrease the chance of shutdown due to excessive
temperatures.
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