Setting the 8–60 Second Timer
7
Figure 2: Rear view of R
umbleR
2 with leads
F1 15 AMP
CLEAR ZIP CORD
RUMBLER SPEAKERS
BLACK ZIP CORD RIBED
BLACK GROUND
RED VEHICLE BATTERY
WHITE HORN RING OR
MOMENTARY SWITCH
RUMBLER AMPLIFIER
MAIN SIREN AMPLIFIER
X
X
CUT WIRE
CAUTION:
CONNECTING THE BLACK ZIP CORD IN PARALLEL
WITH THE MAIN SIREN SPEAKER COULD DAMAGE THE MAIN VEHICLE SIREN AMPLIFIER
BLACK ZIP CORD
BROWN
MAIN SIREN
SPEAKER('S)
290A6482B
Figure 3: Rumbler 2 wiring diagram
Setting the 8–60 Second Timer
SOUND HAZARD
The R
umbleR
2 increases close-proximity warning effectiveness by generating siren signals that better
penetrate a vehicle’s interior. These signals also may increase sound levels in the operator’s vehicle,
and may increase noise exposure to the operator. The amount of this increase will vary based upon
the length of time operators are exposed to noise from emergency operation, the vehicle in which the
R
umbleR
2 is installed, and other factors.
To protect the operator from sound-exposure hearing loss, you should measure the sound levels in
the vehicle and calculate permissible exposure times. One source of permissible exposure times is the
federal OSHA regulations in section 1910.95.
The amplifier’s 8-60 second timer is factory-set for a default time of 8 seconds. After assessing sound
levels in the operators’ compartment, you must adjust the timer on the interface board inside the
amplifier to limit the operating time of the amplifier based upon the expected usage through a work
shift. You should also be sure your operators heed all other warnings associated with the use of sirens,
and provide and require the use of hearing protection, if appropriate, based on your particular expo-
sure levels and conditions of use. If you operate the R
umbleR
2 before you can make an assessment of
operator noise exposures, set it for the shortest amount of time possible and require the use of hearing
protection devices.
For more information on sound exposure, refer to the warnings in “Safety Messages to Operators of
Federal Signal Light and Sound Systems” on page 9 and in “Operating the Rumbler 2” on page 10.
Summary of Contents for Rumbler 2
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