Gen4 - General - Identification Of Safety Functions
The main purpose of the Gen4-LMS is to engage a safety cutout when the machine is lifting a load which is beyond the
capabilities of the machine for the current boom position.
The safety cutout will activate in either one of two ways:
- Using a relay, FET or equivalent device to open an electrical line (e.g. Open circuit / High impedance). The
electrical line will originate from the manufacturer of the machine's electronics and will produce the safety
cutout when opened.
- Send a cutout signal via a communication packet (e.g. CAN) to the machine ECU to produce the safety cutout.
For improved safety both these cutout methods can be used simultaneously (if the machine ECU can support it).
The safety cutout can be considered as the one and only safety function in the Gen4-LMS.
Safety Related Parts
The Pressure Sensors are certified from the manufacturer to meet ISO13849 Pld and they produce a 4-20mA output into
the SPM for processing.
The BPS is used to measure the boom location and is an independent module - as it must be mounted on the boom to
perform its function. This is manufactured by EQSS and has its own performance level calculation. It outputs the
sensor data via a CAN bus network to the SPM for processing.
The SPM is the main processing unit for the safety cutout function. It is mounted on the chassis in a protected location (to minimize damage from environmental conditions). The SPM receives all of the inputs, performs the processing and generates
the output for the safety cutout function. The SPM is manufactured by EQSS and has its own performance level
calculation.
The CAN bus interconnection method used between all blocks is a CAN bus 2.0 network (compliant to ISO
11898 Road vehicles -- Controller area network CAN) and utilizes the industry standard J1939 protocol. The cutout
output block has been designed to produce the safety function if it doesn't receive communication over the CAN bus and it is expected that the machine ECU will produce the safety function (if it doesn't receive communication from the
SPM).
The load processing block has been designed to initiate the safety function if it can't communicate with any of
the input blocks.
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