Elkhart Brass Scorpion 8394-04 - Manual (Page 7)

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mechanism for remote control of the spray pattern from a straight stream to wide fog.
Another
nozzle that my be used on this monitor is the
¾ SM-2000BE
500 to 2000gpm@80psi.
For optimum straight stream performance, stream shapers are provided as part of the monitor
and nozzle system. Solid stream nozzles are also available for use with this monitor
C. 81480001 Center-Stow and 81480011 Left-Stow Relay Control Module
The monitor control circuit uses a state-of-the-art PIC (Programmable Integrated Circuit)
chip design. This device allows numerous control features while keeping circuit board size
to a minimum. Relays within this box provide motor reversing control for the up-down, left-
right and straight stream-fog functions. The control module provides motor protection with
the use of electronic current sensing circuitry. When monitor travel limits are reached, this
circuitry senses motor stall current within a few milliseconds, and automatically shuts off
power to the motor. As soon as the control switch is released, the circuit resets to allow
subsequent operation of the monitor.
In an effort to eliminate the need for the installer to open the relay control module, we ship
the assembly with pre-installed cables for connection to the primary and secondary switch
boxes, and to the monitor wiring harness. The enclosure is NEMA 4 rated (drench proof),
and suitable for installation at any location on the apparatus other than high temperature areas
such as the engine compartment.
The following additional functions/features are provided in the relay control box:
¾ Reverse Polarity Protection: If battery connections are reversed, this feature
prevents power from being applied to circuits, and prevents damage to electronic
components.
¾
Control Override Capability: This feature provides compliance with NFPA 1901
Paragraph 16-6.1(b). The controls at the aerial operator's position override secondary
controls (i.e. at ladder tip).
¾
Circuit Board Moisture Protection: The circuit board and circuit components are
protected from moisture by an acrylic resin conformal coating. All relays have sealed
covers.
¾
Indicator Lights for Control System Trouble Shooting: LED indicator lights are
located on circuit board inside relay box for purpose of checking control circuits and
PIC chip operational status.
¾ Stow Feature: See document 98284060 (Found in instruction packet 98421001
included with 81480001 or 81480011Relay Control Module) for a complete
description of the stow feature including a description of the stow indicator output.
¾
Electronic Current Sensing (ECS): The control system also provides secondary
motor protection with the use of ECS circuitry. If the monitor encounters an