Service Manual DS 85
© Hirschmann Rev.G 10/05/15 190166_G.DOCXG
Central Unit/Console: Inside the console there is a CPU and connection board. The board has a
hard mounted connector for power, ground, bus controller, and slew indication. Displays all
geometrical information such as actual load, maximum load permitted by load chart, working radius,
and length, angle, and head height of main boom. It also has LED’s for operating condition “OK”,
overload, and a pre-warning. An output to an alarm horn and a warning light are also available. The
display allows for a simple configuration setup, as well as sensor calibration (zero adjustment), and
troubleshooting sensor output screen.
Pressure Sensor: The pressure sensor transforms hydraulic pressure into an electric signal. A
pressure sensor block houses two sensors, CAN bus controller, and two bus connectors. One
pressure sensor is connected to the piston side of the lift cylinder and the other to the rod side.
Length Sensor: A reeling drum drives a potentiometer that measures the length of the boom. This
sensor is connected to the CAN bus sensor board in the angle sensor box.
Angle Sensor: The angle sensor is a potentiometer driven by oil damped and weighted pendulum
that measures the angle of the boom. This sensor is connected to the CAN bus converter board in the
angle sensor box.
Anti-Two-Block Receiver: The anti-two block receiver console has several LED lights for quick
status indication including POWER, ONLINE, LOW BATTERY, and INFO. When the weight is lifted
on the A2B switch or a signal is not received from the transmitter, the receiver disengages a relay
output and drops power from the lock out solenoid valves.
Anti-Two-Block Transmitter and Switch: The anti-two block switch monitors the load block and its
relationship with the head of the boom. In working condition the switch is closed. The weight at the
anti-two block switch keeps the switch closed until the hook block strikes it. When the hook block
strikes the weight, the circuit opens and the transmitter sends a signal to the receiver. The transmitter
has an LED on the bottom for diagnostics. The LED should light momentarily when a two-block
condition occurs or when the weight is lifted. The LED will then flash rapidly during a two-block
condition and will stop flashing after the switch remains in this state for more than 15 seconds. The
LED will flash approximately every 2 seconds when the switch is transmitting. When in sleep mode,
the LED will not flash.
Hardwired Anti-Two-Block Switch: The anti-two-block switch monitors the load block and it’s
relationship with the head of the boom. In working condition the switch is closed. When the load
block strikes the weight the circuit opens, disengaging a relay output to the lock out solenoid valves,
where applicable. To check the cable for damage, (short circuit to ground) there is a 4.7k resistor
between ground and the contact of the switch, to give a signal back to the central unit. The weight at
the anti-two-block switch keeps the switch closed until the load block strikes it.
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