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Description of the System

qSCALE i2 Cranes (Tool Version 3.0.34) Service Manual / Issue B / 11-2017 / ac.

2.1.3.3 Pressure Transducers

The pressure transducers convert hydraulic pressure into an electric signal. The

pressure transducers are connected to the CAN bus junction box. One pressure

transducer is connected to the piston side of the lift cylinder and the other to the rod

side.

2.1.3.4 Cable Reel (Length-Angle Sensor)

The length-angle sensor (LWG), often referred to as the “cable reel”, is installed on

the base section of the boom can measure the length and the angle of the boom

along with transmitting signals to the boom tip.

A reeling drum drives either a potentiometer or rotary encoder to measure the length

of the boom. The length cable on the drum connects to the boom tip and can transmit signals from the

chassis through a slip ring within the LWG housing through the length cable to the boom tip.

The angle sensor is either a liquid capacitive angle sensor (WGC) or a MEMS based angle sensor

(WGX). Both length and angle sensor are connected to a CAN bus board which is connected to the bus

system.

2.1.3.5 Anti-Two-Block (A2B) 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. When the load block strikes the

weight, the circuit opens, disengaging a relay output. 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.

Hirschmann qSCALE i2 Service Manual

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