Service Manual DS 85
© Hirschmann Rev.G 10/05/15 190166_G.DOCXG
3 SYSTEM DESCRIPTION
The DS 85 system is a CAN bus system consisting of a central micro processor unit/operating
console, length/angle sensor, pressure transducers, and anti-two block switches.
The Load Moment Indicator system operates on the principle of reference/real comparison. The real
value, resulting from the pressure measurement is compared with the reference data, stored in the
central processor memory and evaluated in the micro processor. When limits are reached, an
overload warning signal is generated at the operator’s console. At the same time, the aggravating
crane movements, such as hoist up, telescope out and boom down, will be stopped.
The fixed data regarding the crane, such as capacity charts, boom weights, centers of gravity and
dimensions are stored in memory in the central processor unit. This data is the reference information
used to calculate the operating conditions.
The operating modes are selected by the operating mode key on the console by scrolling through the
text messages defining the boom truck configuration.
The crane load is measured by pressure transducers attached to the piston and rod side of the hoist
cylinders.
Boom length and boom angle are transmitted by length/angle CAN bus node mounted on the side of
the boom in the angle sensor box. The length sensor/cable reel is mounted inside the base which
measures the boom length.
The PAT RATB works like our normal Anti-Two-Block. It alerts to an impending two-block
condition. This alert can come in the form of an audible alarm and visual LED or with the
optional function lockout if the crane is so equipped.
The iSENS HES-W1 is a battery operated limit switch for the detection of the hoist limit
condition, e.g. on the lifting rope of a crane. The wireless module with integrated battery
compartment serves the wireless transmission of the hoist limit condition to suitable wireless
receivers. An operating period of up to 2 years is achieved by the use of power-saving
techniques when using lithium batteries.
The receiver is mounted into a receiver box located near the operating station. The receiver box
provides the following indications: Power, Online, Info, and Low Battery. The receiver will work
10..30VDC and fused to 1 Amp.
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