Hirschmann PRS 80, Operators & Service Manual

Page: 24 / 48

Operator’s Manual PRS 80 24
6.4 Repeater
The purpose of the repeater is to reduce the possibility of a communication loss error by receiving the
load cell transmitted ID code and re-transmitting the same ID code out to the PRS 80. To do this, the
repeater is positioned at the boom tip, up the hoist rope from the load cell and up the boom from the
PRS 80. If the load cell does not have a direct line of sight or blocked by a wall/structure from the PRS
80 then there is less chance of the signal absorption/interference.
Power cable connections: PIN 1 - +UB (9 to 30VDC), PIN 2 - GND
The repeater is setup from the factory to repeat signals from the load cells to the PRS 80 receiver.
PRS 80 can receive both transmissions (load cell and repeater) and output the load signal to the
system computer.
After switching power on to the repeater from the crane ignition switch, the system starts with an
automatic test of the repeater board, LEDs, and electronic components. The red power LED should be
on and other red LED blinks when the repeater is transmitting a signal.
6.5 Load
6.5.1 Load cell Installation
The load cell is installed at the dead end of the wire rope that is being used to lift the load. Use the
appropriate pins for the type and size of socket, block or ball that is being used. Note: The pin size
should have been specified when ordered and should match the existing pin diameter. Ensure that the
correct pin used is rated for the maximum line pull capacity. For the 7.5 ton load cell, install the pin so
the pin head on the antenna side. The pin diameter, jaw thickness and jaw opening used to connect to
the load cell will effect position of the antenna. There is 90° fitting for the antenna P/N 031-300-050-
535 maybe necessary in some cases. Ensure all safety pins are installed properly with washers and
bushing to fit the hole diameter and pin length.
7.5 ton Installation
Install the plate using the 2-1/4” pin so the pin head on the antenna side. The plates have a rest button
installed to prevent the plates from striking the transmitter on the side of the load cell. On rest button
should be on the load cell side of the plate. Ensure all safety pins are installed properly with washers
and bushing to fit the hole diameter and pin length.
© Hirschmann PRS80 REV. C 09/26/05 190183_D.DOC