EXTENSION SENSOR
The extension sensor provides an increasing voltage proportional to the extension of the
boom. A cable attached to the boom head provides a low current electrical path for the
A2B signal
PRESSURE TRANSDUCERS
Two pressure transducers measure the pressure in the boom hoist cylinder. The resultant
Total Moment signal is processed to provide a continuous display of the load suspended
below the point of lift.
ANTI TWO BLOCK (A28)
A switch monitors the approach of the hookblock or overhaul ball to the boom head. The
switch is held in the normal position until the hookblock or overhaul ball raises a weight that
is mounted around the hoist rope. When the weight is raised, it causes the switch to
operate. The resultant signal is sent to the computer via the extension reel causing the A2B
alarm to operate and function kick-out to occur.
FUNCTION KICK-OUT
Electrically operated solenoids disconnect the control lever functions for boom hoist lower,
telescope out, and winch up whenever an overload or an A2B condition occurs.
OPERATOR SETTABLE ALARMS
These alarms, when properly set by the operator, define the operating range. This is
achieved by means of minimum and maximum angle, maximum height, and/or maximum
length. These alarms can be programmed for each job site and allow the operator to work
in a defined area.
AREA ALARM
When set, this alarm permits the operator to define the operating zone by only two set
points. The use of this method of setting results in a greatly enhanced working area, and
also clearly defines the operating zone.
RT500
Operating Instructions
68 REVISED:
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